HOW-TO: Replace Fuel Filter - S-10 Forum
 
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post #1 of 38 Old 04-08-2010, 02:11 PM Thread Starter
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HOW-TO: Replace Fuel Filter

I did this on a 1995 2.2L truck but it should be very similar for all the blazers/s10's

First off go buy the stuff and get what you need available:

Fuel Filter
Anti-Seize
Rag
Pan/shallow bucket
Proper wrenches
small Flathead screwdriver
May need penetrating oil

My truck is lowered so you may have to start off by either driving up on ramps or jacking it up and SAFELY securing it with properly rated jack stands.

The fuel system is (in theory) always pressurized even if the truck is not running so you must relief at least some of the pressure.

The way I did it was to pull the fuel pump relay(fuse would work too). The relay is located in the glove box on my truck but I believe it can be found under the hood on the later trucks.


^^^Relay Location, one of em is the fuel pump couldn't remember which so pull em all)

Once its pulled, turn the key to run position and you should NOT hear the fuel pump prime (sounds like a whine/hiss noise). If you don't hear it congrads you found the right relay. Then proceed to start the truck like normally. It may have enough reserve pressure in the lines to actually start it and run for a second or two or may just crank for 3 seconds. Either way you just relief most the the pressure.

----OR----

Ive also heard you can just not worry about the pressure as its not much volume so some people just throw a rag around the filter nuts and start cracking the lines till fuel comes out and letting it drain that way. I don't like this method as its still under pressure and spraying fuel doesn't seem too great of an idea to me and then your stuck with a fuel soaked rag lol

crawl under the truck with your wrenches (sorry I cant remember the sizes) line wrenches are the best but can be done with well fitting regular wrenches. I happen to use 2 crescent wrenches but the filter was changed 50K ago and we put anti-seize on the connections, but more on that later.

Locate the fuel filter, should be on the drivers side frame rail on the inside(the flex fuel trucks Ive heard is different but not sure 100% on that)

Its the can looking thing with the plastic strap around it.

Take your wrenches and hold the filter still with one while trying to unscrew the other that's on the line. Be careful not to round off the nuts! go slowly so you don't twist off and break the line. Once you crack them open gas is still going to come out so have a pan ready just crack it a bit and let it drain.

Once you get the connections off the filter you need to pop the plastic hold-down open with the flat screwdriver so the line is somewhat free to wiggle around.

On mine the tank side connection the nut wouldn't rotate on the line so I just left it and got the engine side to spin on the line. I just undid the front, carefully got the line out of the way and just spun the filter off the tank side connection.



On mine I couldn't get the stupid plastic filter holder off the frame rail so I just made a cut at the top so I can kinda snap it in. Helps greatly and still does its job. You can kinda see the plastic hold down where the 3 lines come together in the picture.


Compare the old with the new making sure you got the right one


When you go to put the new one on take special care that you put it on the right way. It should have a mark telling you the direction of flow on the filter or in the filter directions if any.


Installationis reverse of what you did to get the old one off. Use anti-sieze (but not too much) on the line threads and where the nuts rotate on the lines so the next 30K + miles when you have to do this again it makes it ALOT easier to do.


finishedpic, i loaded the nuts up with anti-sieze but waterproof grease would work too to prevent rusting.

Plug the relays back in (or fuse) and turn the key to the run position but do not start.

You should hear the fuel pump prime (whine hiss whatever you want to call it) once its done check to make sure it isn't leaking anywhere.

If its not start the truck and let it run for a little bit make sure there's no leaks and whatnot.

If there isn't your done!

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post #2 of 38 Old 04-08-2010, 03:19 PM
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Re: HOW-TO: Replace Fuel Filter

Yours is easier than my truck. I don't have the plastic band, it's metal on mine, so you have to take it off and force the filter out of it. But I did the crack the line loose method to relieve pressure. it's not that bad.

Nice write up man.

Just another method to relieve pressure.
Use either a fuel pressure tester or screwdriver to push in the fuel pressure check valve next to the passenger side engine head.


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post #3 of 38 Old 04-09-2010, 01:11 AM Thread Starter
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Re: HOW-TO: Replace Fuel Filter

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Originally Posted by deathphoenix99 View Post
Yours is easier than my truck. I don't have the plastic band, it's metal on mine, so you have to take it off and force the filter out of it. But I did the crack the line loose method to relieve pressure. it's not that bad.

Nice write up man.

Just another method to relieve pressure.
Use either a fuel pressure tester or screwdriver to push in the fuel pressure check valve next to the passenger side engine head.
ahhh yes forgot about that valve (not sure if mine even has one)

yea i knew there were variances throughout the years and dont know em all. BUT the basic principles are the same.

i didnt know they switched to metal bands... (seems kinda redundant to me lol)

thanks tho! may have to revise it once I learn more about all the variances.
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post #4 of 38 Old 04-09-2010, 08:35 AM
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Re: HOW-TO: Replace Fuel Filter

No, 94 had metal bands, the newer ones appear to have a plastic one. I plan on changing mine this weekend, so I'll get some pics of it for you.


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1994 S10 160,XXX miles. Lifted 4/3
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post #5 of 38 Old 04-09-2010, 04:24 PM Thread Starter
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Re: HOW-TO: Replace Fuel Filter

yes if you want ill add em to mine with credit to you

also if you can get a pic of the check valve on the fuel line that would help too
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post #6 of 38 Old 04-09-2010, 07:30 PM
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Re: HOW-TO: Replace Fuel Filter

good write up.

that cavalier is mint.

when i did my in line fuel filter i just took it off and got covered in gas =) there is def some pressure in there.

i threw my old filter out from under the truck on the ground about 10 ft away and installed the new filter. i then looked at the old filter on the ground, there was a ton of black shit that came out. it was fukced. fuel filters are cheap and take less than 5 minutes to do, i recommend that everyone do their filter when they buy a s truck and like once a year or something.

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post #7 of 38 Old 04-09-2010, 08:34 PM Thread Starter
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Re: HOW-TO: Replace Fuel Filter

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Originally Posted by Nitemare View Post
good write up.

that cavalier is mint.

when i did my in line fuel filter i just took it off and got covered in gas =) there is def some pressure in there.

i threw my old filter out from under the truck on the ground about 10 ft away and installed the new filter. i then looked at the old filter on the ground, there was a ton of black shit that came out. it was fukced. fuel filters are cheap and take less than 5 minutes to do, i recommend that everyone do their filter when they buy a s truck and like once a year or something.
haha yea,

recommended is every 30K miles
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post #8 of 38 Old 04-09-2010, 08:48 PM
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Re: HOW-TO: Replace Fuel Filter

Mine also had like a cement color gunk coming out of the filter. I will definantly get pics this weekend.


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1994 S10 160,XXX miles. Lifted 4/3
1985 Ramcharger Royal SE Prospector 440/727/NP203 (beach toy)
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post #9 of 38 Old 04-15-2010, 12:57 AM
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Re: HOW-TO: Replace Fuel Filter

Well, I went to change my fuel filter last night. But I ran into a problem. The nut on the fuel line on the inlet side is siezed up. I started twisting the fuel line while trying to break it loose. So my fuel line has a small indentation where it's twisted. I stopped there and i'm leaving my filter till i get more money. I'm either going to splice in a section of fuel line or replace the whole section to the gas tank with a junk yard one. depends on cost of both methods. I don't own the flaring tools, so i'd have to buy them if I went that route.


BTW. My fuel filter is held on by the plastic style holder. I thought it was metal for some reason, but I guess it's just like yours. But I had one hell of a time getting my fuel filter out and the new one in last time I replaced it in 06. And i even had mine on the ground and no longer bolted to the frame.


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1994 S10 160,XXX miles. Lifted 4/3
1985 Ramcharger Royal SE Prospector 440/727/NP203 (beach toy)
1982 Dodge W250 360/NP435/NP208 lifted on 36's, mud toy.
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post #10 of 38 Old 04-15-2010, 01:47 AM Thread Starter
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Re: HOW-TO: Replace Fuel Filter

Quote:
Originally Posted by deathphoenix99 View Post
Well, I went to change my fuel filter last night. But I ran into a problem. The nut on the fuel line on the inlet side is siezed up. I started twisting the fuel line while trying to break it loose. So my fuel line has a small indentation where it's twisted. I stopped there and i'm leaving my filter till i get more money. I'm either going to splice in a section of fuel line or replace the whole section to the gas tank with a junk yard one. depends on cost of both methods. I don't own the flaring tools, so i'd have to buy them if I went that route.


BTW. My fuel filter is held on by the plastic style holder. I thought it was metal for some reason, but I guess it's just like yours. But I had one hell of a time getting my fuel filter out and the new one in last time I replaced it in 06. And i even had mine on the ground and no longer bolted to the frame.
lol yea one of my l;ines was seized so i had to spin the filter in the holder which obviously didnt want to too easily so we cut a notch in it at the top. haha
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post #11 of 38 Old 04-15-2010, 12:10 PM
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Re: HOW-TO: Replace Fuel Filter

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lol yea one of my l;ines was seized so i had to spin the filter in the holder which obviously didnt want to too easily so we cut a notch in it at the top. haha
That or get some channel locks and crush that filter and keep the filter from spinning when your loosening the nut. Of course dont go doing this w/o a plan to fix it no matter what before driving it again cause once you crush that filter you'll be screwed.

And the way we always relieved pressure in the shop i worked at was pull the gas cap. but you'll still piss a bunch of fuel out when you go cracking that line loose.

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post #12 of 38 Old 04-19-2010, 11:48 AM
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Re: HOW-TO: Replace Fuel Filter

On a 98-up:

The inlet is a thread on as described above, the outlet of the fuel filter is a quick release connector.

As stated above, I removed the fuel pump relay to try to starve the engine of gas, and then I took off the gas cap to try to relieve any fuel pressure.



^It's easier to get as much gas out as you can first, so push in the two tabs on the plastic piece. You can see the one on the front, and there is one on the back, then you can pull it off and drain it into a pan.

Next, I loosened the inlet.




I used a 16 and 20mm.

After I got both lines off, I used a 13mm ratchet on a 1/4 extension and 1/4 ratchet to get the fuel filter off the frame. The extension fits right between the fuel lines and the band around the fuel filter.



After I got the bolt out, the fuel lines came out of the top with some wiggling. There are three lines there. I then made a mental note of how far down the band was. I put the fuel filter between two pieces of wood that I had laying around, so they would grab the band. I then pushed on the fuel filter, and pushed the new one on the same amount.

I hate saying this, but installation is opposite of removal. It's really not that tough. Just put the bolt back in, screw the hardline in first and tighten it, then snap the quick connect on. I would wait to snap the three lines on top until last.

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post #13 of 38 Old 08-31-2010, 12:12 AM
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Re: HOW-TO: Replace Fuel Filter

i hate to sound like an idot but wouldn't as soon as you unscrew the fuel filter ,even after you relive pressure, a BUNCH of gas spill out.
i ask cuz my truck has 184k and im pretty sure its the original fuel filter. at least its been a while. and i want to change but i donw want a gas bath or worse a fire

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post #14 of 38 Old 08-31-2010, 02:02 AM
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Re: HOW-TO: Replace Fuel Filter

Yes gas will spill out.

Make sure you have a rag handy and even a small container if you want. Wear safety glasses if you want to make sure nothing gets in your eyes.

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post #15 of 38 Old 08-31-2010, 02:42 AM
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Re: HOW-TO: Replace Fuel Filter

A couple of things I can contribute:

-it's actually 97+ trucks that have the quick connect on one side of the filter

-my original filter was stuck in the plastic thing pretty good but I was able to get it out with a little oil and turning the filter body with a wrench (downwards only)

-PULL THE DAMN RELAY! and depressurize the system. I've changed the filter using both methods now, and it's so much easier and safer to do it the proper way. Don't get lazy.

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post #16 of 38 Old 08-31-2010, 02:42 PM
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Re: HOW-TO: Replace Fuel Filter

how much gas are we talking cuz you know mettle wrench+mettle bolt=spark+gas= fire. again im probably over thinking this but i know that gas com busts all most by its self. and i really dont want to blow my self or my truck up. i could do it on a empty tank?

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post #17 of 38 Old 08-31-2010, 03:43 PM
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Re: HOW-TO: Replace Fuel Filter

De-pressurize the system and you have nothing to worry about. Just have a rag and small container ready for the fuel that will drain out of the filter. And wear safety glasses just to be sure.

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post #18 of 38 Old 08-31-2010, 04:26 PM
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Re: HOW-TO: Replace Fuel Filter

use the fuel rail (schrader valve)to depressureize

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post #19 of 38 Old 09-01-2010, 06:56 AM
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Re: HOW-TO: Replace Fuel Filter

chris stop being a pussy people change their fuel filter all the time without lighting themselves on fire.

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post #20 of 38 Old 09-01-2010, 12:56 PM
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Re: HOW-TO: Replace Fuel Filter

you can pull the relay out while it's running for the fuel pump, then once it stalls, you can open the gas cap. There is no pressure, but still like three to five shot glasses of gas will come down since the fuel filter is the lowest part in the fuel system, all the gas will come down from the engine. Not that big a deal, just do it over a stone driveway. Even trying it with a pan didn't help, the gas spread out further than the size of the pan

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post #21 of 38 Old 09-02-2010, 06:16 PM
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Re: HOW-TO: Replace Fuel Filter

if anyone finds that the line won't come off due to corrosion and the line twists,you can buy a repair line that comes w/correct flange-nut and oring.also included is a compression coupling to connect where you cut old line off.got mine on jegs.

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post #22 of 38 Old 09-03-2010, 02:35 AM
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Re: HOW-TO: Replace Fuel Filter

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chris stop being a pussy people change their fuel filter all the time without lighting themselves on fire.
lol

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post #23 of 38 Old 09-03-2010, 07:34 PM
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Re: HOW-TO: Replace Fuel Filter

I've done it twice on my 98, the first I just undid the quick connect and let it drain the excess and the second time opened my gas cap before. Didn't really notice a difference between the two and I've never even bothered with pulling the relay. To someone that has done both (with and without relay), does it make much difference at all?

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post #24 of 38 Old 07-21-2011, 05:07 PM
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Re: HOW-TO: Replace Fuel Filter

I need to know if my 2003 Sonoma has a fuel filter outside of the tank. My parts guy said there was not a listing for one 'cept for the flex fuel.

I would be driving and there would be a 100 RPM drop in RPMs and then back to speed. It would do this until I punched it and it would get going.

Last night, It would not start and just crank and crank for 10 minutes and it finally started.

Today, it would not start again until cranking and cranking and when it started it idled smooth for like 15 ninutes and I shut it off and it would not start again.

Whats the deal? I priced some on ebay and they run from $8-$15 but the parts place only has $56 flex fuel ones.
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post #25 of 38 Old 07-21-2011, 08:03 PM
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Re: HOW-TO: Replace Fuel Filter

Yup, take a look on the inside of the driver's side frame rail. (I'm presuming that your truck is a non-flex by what you're saying)

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post #26 of 38 Old 07-23-2011, 03:15 PM
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Re: HOW-TO: Replace Fuel Filter

Quote:
Originally Posted by Lawdog1911 View Post
I need to know if my 2003 Sonoma has a fuel filter outside of the tank. My parts guy said there was not a listing for one 'cept for the flex fuel.

I would be driving and there would be a 100 RPM drop in RPMs and then back to speed. It would do this until I punched it and it would get going.

Last night, It would not start and just crank and crank for 10 minutes and it finally started.

Today, it would not start again until cranking and cranking and when it started it idled smooth for like 15 ninutes and I shut it off and it would not start again.

Whats the deal? I priced some on ebay and they run from $8-$15 but the parts place only has $56 flex fuel ones.


the reason they cost so much is because its a 98+ and have clip plugs on the one end, they are ALL $40+

i have an 03 and i can tell you those $8-15 filters will not work.


and so you know, all 2003's were non flex, all 2002s were flex.



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post #27 of 38 Old 03-02-2012, 03:27 PM
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Re: HOW-TO: Replace Fuel Filter

It really amazes me how a simple 10 minute project can turn into a ****ing nightmare.

I've been trying in total vain to remove my fuel filter for over an hour now. I got the quick clip side off and then it just pours fuel to no end until I put the fuel line back on. And god forbid the nut EVER come the **** off of the other side even after being SOAKED in WD-40 for 40 minutes. Nothing. Not even a budge. I am fuming angry right now.

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post #28 of 38 Old 03-02-2012, 04:05 PM
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Re: HOW-TO: Replace Fuel Filter

you have to elevate the fuel lines or it will just keep pouring out. its siphoning gas out your tank and will go till your tank is empty. i had the same thing happen to me till i was able to get the line up high enough.

i have a flex fuel so i didnt have any bolts to deal with. all quick connects.

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post #29 of 38 Old 05-20-2013, 11:24 PM
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Re: HOW-TO: Replace Fuel Filter

Payne should the truck be parked with the front end up? making the tank the lowest
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post #30 of 38 Old 05-28-2013, 12:00 AM Thread Starter
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Re: HOW-TO: Replace Fuel Filter

could help, WD40 is not a penetrating oil, go get liquid wrench and let it soak half a day spraying it every 30 min or so. Might try tightening the nut first then loosening.
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post #31 of 38 Old 07-29-2013, 12:47 PM
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Re: HOW-TO: Replace Fuel Filter

I need to do this as well bad. The lines are very rusty and I do not want to break or crack the lines. I cannot have another vehicle down. I though about relocating the fuel filter in the engine bay. Also doing a water fuel separator. Just seeing what comes out of the w/f separator on semis at work is amazing. Makes me wonder on my truck. I have anew tank and sending unit in so I know I am good there. I will do the pb blaster on it for a few days. Great write up.
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post #32 of 38 Old 07-29-2013, 09:37 PM Thread Starter
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Re: HOW-TO: Replace Fuel Filter

trust me if you put a crapload of anti sieze back on the threads and new filter it wont sieze. i live in the salt and rust belt and it hasnt siezed yet. much easier to leave it where it is.
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post #33 of 38 Old 08-04-2014, 02:12 PM
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Re: HOW-TO: Replace Fuel Filter

just did this yesterday and it was pretty easy minus getting a fuel bath. luckily i had the quick connect hoses. thx for the writeup, i ended up pulling the fuse instead of the relay as i couldnt figure out how/what to disconnect behind the glove box.
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post #34 of 38 Old 04-19-2015, 03:33 PM
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Re: HOW-TO: Replace Fuel Filter

I never did it in my 94 S10 as I got rid of it. How ever I did buy a 2003 ZR2 S10 April last year. Doing this today. Surprised Wal-mart had my filter. Did the oil cooler line delete.

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post #35 of 38 Old 04-19-2015, 04:55 PM
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Re: HOW-TO: Replace Fuel Filter

Fitting is to tight. Have it set with pub oil on it.

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post #36 of 38 Old 09-09-2015, 10:21 PM
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Re: HOW-TO: Replace Fuel Filter

What if I cant get the nut loosened from filter, frozen on. Short on replacing the line back into tank, where I have to drop tank any ideas?
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post #37 of 38 Old 09-17-2015, 08:47 PM Thread Starter
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Re: HOW-TO: Replace Fuel Filter

it should, make sure you have good fitting wrenches and have at it.
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post #38 of 38 Old 09-19-2015, 02:00 PM
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Re: HOW-TO: Replace Fuel Filter

I can't resist. A old mechanic said to spray the fitting with water, wait 10 min and rap the fitting a few times with a wrench, spray it again and wait 10 min then try to loosen.
I never tried it, I'v been told it works.

If you used penetrating oil, remove it first with brake cleaner.

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