FPR going out the door???

[Wicked Mayhem]

within the past id say 3-4 days, i my blazer cranks for a little bit then starts. i noticed it at first cause i went to start it and it cranked for about 5 seconds. so i stopped. and cranked again and it started right up like normal. i know if it sits for atleast 4 hours it will do it. so i just went out and started it after sitting about 5 hours and cycled the key 3 times and it started up like normal.

is this my fuel pressure regulator? fuel pump? something else? any help, id like to fix the problem now before it gets to the point where im broke down somewhere.

[Xtreme24]

I just went through the same thing on my truck and it was the fuel pump.

[Wicked Mayhem]

Quote: Originally Posted by Xtreme24

I just went through the same thing on my truck and it was the fuel pump.

shit.. thats what i was afraid of.. damn damn damn lol.

maybe a couple people will chime in and it was the fpr

[Rhotpursuit]

Quote: Originally Posted by Wicked Mayhem

shit.. thats what i was afraid of.. damn damn damn lol.

maybe a couple people will chime in and it was the fpr

Nah...it's the pump. I just bought an oem Delphi from www.getgmparts.com for $207.10...shipped FedEx Express.

[Wicked Mayhem]

where can i find the part number for the one i need?

[Rhotpursuit]

Quote: Originally Posted by Wicked Mayhem

where can i find the part number for the one i need?

Give them a call...they will look it up for you. Nice guys..ordered on tuesday...got it thursday. Mine was a FG0028.

[Wicked Mayhem]

Quote: Originally Posted by Rhotpursuit

Give them a call...they will look it up for you. Nice guys..ordered on tuesday...got it thursday. Mine was a FG0028.

ah ok. i guess ill try n call monday, but in sure they are off.

autozone wants 331.99 1 year warranty
advance auto wants 384 lifetime warranty (bosch)
getgmparts wants 306 shipped(dunno warranty)

[lesterl]

Wait a minute, have you checked the fuel pressure key on engine off when cold (when it would crank long?)

Does the fuel pump run when you first turn the key to run?

Have you checked the fuel pump relay?

What year is your truck?

Have you checked the fuel pump grounds to the frame rail?

Have you replaced the fuel filter yet?

[Wicked Mayhem]

Quote: Originally Posted by lesterl

Wait a minute, have you checked the fuel pressure key on engine off when cold (when it would crank long?)
no


Does the fuel pump run when you first turn the key to run?
yes


Have you checked the fuel pump relay?
no(wouldnt the pump not work if the relay was bad?


What year is your truck?
2002 blazer


Have you checked the fuel pump grounds to the frame rail?
no


Have you replaced the fuel filter yet?
no

havent done any of those things. i planned on checking fuel pressure tomorrow.

what should all the pressures be?

[lesterl]

http://store.getgmparts.com/fuel-pumps.html For pump prices maybe.
www.rockauto.com or www.acdelco.com for part #'s

Should be around 60 key on engine off. (will drop a little when running as injectors are firing and lowering pressure slightly.

The Oil pressure sender will run the pump after the engine developes pressure (about 4 PSI).

I would buy a filter and replace that before I even had the pressure checked, leaving a bad filter on can cause a pump to fail, so can running tank empty all the time. Just FYI. :-)

[Wicked Mayhem]

if it sits overnight and i check it in the morning before cranking again should it still show around 60? or do i need to let pump cycle once before checking?

and yeah, i run my tank dry usually lol.. its got 1/4 tank right now.

[Rhotpursuit]

Quote: Originally Posted by Wicked Mayhem

ah ok. i guess ill try n call monday, but in sure they are off.

autozone wants 331.99 1 year warranty
advance auto wants 384 lifetime warranty (bosch)
getgmparts wants 306 shipped(dunno warranty)

What is your part #??

[Wicked Mayhem]

Airtex - E3954M
Bosch - 67408

[Rhotpursuit]

Quote: Originally Posted by Wicked Mayhem

Airtex - E3954M
Bosch - 67408

Got a GM/Delphi #??

[Wicked Mayhem]

Quote: Originally Posted by Rhotpursuit

Got a GM/Delphi #??

nope.. couldnt find one.

[Wicked Mayhem]

OK i went out and checked the fuel pressure.

i hooked up the gauge, turned the key to on position, fuel pressure went up to 58psi, then bled down to 57psi.

then i shut key off and let it cycle one more time and it went up to 58 psi and stayed there. so i started it, but stayed in this like half idle/ half wanting to die stage for about 5 seconds,then i gave it a little gas and it idled fine. the psi was 56 when running.

then i shut it off, and then cycled the key one more time and the fuel pressure sat at 60psi.

[Xtreme24]

mine was only putting out 50 psi at key on/engine off.

[lesterl]

Well, that doesnt sound horrible, what was the run pressure?

If it is the pump, pick your poison->
http://198.208.187.182/internet/VehiclePartDescription.jsp?selectedfld=&applicatio n=Car%2FLight+Duty+Truck&year=2002&make=CHEVROLET& model=BLAZER&engine=V6+4.3L+262cid+GAS+FI+N+Engine +VIN+%3D+W++++++&productline=22&part=6256

[Wicked Mayhem]

Quote: Originally Posted by Xtreme24

mine was only putting out 50 psi at key on/engine off.

hmmm.. and you replaced the pump and pressure was right after that?

Quote: Originally Posted by lesterl

Well, that doesnt sound horrible, what was the run pressure?

If it is the pump, pick your poison->
http://198.208.187.182/internet/VehiclePartDescription.jsp?selectedfld=&applicatio n=Car%2FLight+Duty+Truck&year=2002&make=CHEVROLET& model=BLAZER&engine=V6+4.3L+262cid+GAS+FI+N+Engine +VIN+%3D+W++++++&productline=22&part=6256

56 psi when running.

[lesterl]

56 running isnt bad either (is lower because injectors are opening.) When you go to crank it (cold, would act up) can you hold pedal to floor (flood clear mode) if you have a leaky spider or FPR it could be flooding you out causing your rough running/ hard starting.

[Wicked Mayhem]

Quote: Originally Posted by lesterl

56 running isnt bad either (is lower because injectors are opening.) When you go to crank it (cold, would act up) can you hold pedal to floor (flood clear mode) if you have a leaky spider or FPR it could be flooding you out causing your rough running/ hard starting.

so i need to let it sit atleast 4ish hours to where i know it will do it again and turn the key on to let it cycle once, and then crank it with the pedal to the floor? and by doing that it will let me know if i have a leaky spider or my fpr.

wheres the spider thing? under the intake?

http://cgi.ebay.com/ebaymotors/Centr...spagenameZWDVW

[lesterl]

The Spider is the Fuel Injector setup that houses the injectors and has little tubes that run to poppet valves at the end that are stuck into the intake runners (looks like a fat spider), the FPR is the Fuel Pressure Regulator (diaphram is notorious for getting a pin hole and leaking), the Spider assembly would come with a new FPR and the new ones convert the CSFI to a MPFI setup (instead of the poppet valves you have actual injectors at the end of the legs). But you need to see what is going on first as it is around $300 also.

[lesterl]

How does she run at higher RPMs, some people are having issues with top end RPMs when spider is bad, (FYI the FPR is available separate from the spider). To really check and see you would have to pull everything apart (top of intake and see if there are some clean spots.)

And you may have something totally differnt than this wrong.

[Wicked Mayhem]

it runs perfectly fine all the time, it just has trouble starting after sitting for atleast 4 hours.

[lesterl]

http://www.gmpartsdirect.com/

spider #12568332
Seal Kit #17113215

If you are curious (Taken from another post)

[lesterl]

That almost sounds like a leaky FPR, can you take the tube off the intake, open the throttle and look down in with aflashlight and see if there is a clean area? Should be alot of black gunk around, but if you see a clean spot it is probably getting cleaned by raw fuel.

[Wicked Mayhem]

Quote: Originally Posted by lesterl

That almost sounds like a leaky FPR, can you take the tube off the intake, open the throttle and look down in with aflashlight and see if there is a clean area? Should be alot of black gunk around, but if you see a clean spot it is probably getting cleaned by raw fuel.

i will go do that in a minute as well. ill get a picture.

[Wicked Mayhem]

...

[Wicked Mayhem]

Delphi Modular Fuel Pump 2 Door part#FG0249

just incase anyone searches for it in the future...

http://go.delphi.com/CS/DPSS/CATALOG... umber=FG0249

http://go.delphi.com/CS/DPSS/CATALOG...20--%20VIN%20W

http://store.getgmparts.com/fg0249.html

and according to that getgmparts.com they want 275.87+25shipping(fast shipping) and it says gm price is only 280.27(plus tax).. if that gm price is still the same ill just get it locally. i dont mind payin a few extra bux to get it now.

[Wicked Mayhem]

since i already have it.. heres what your pressure should not look like while cranking lol..

disconnect this wire.


it should be at 58psi while cranking

[thrice4life44]

wow dont sound too good like that get this bitch fixed!!!!

[lesterl]

Man, think your pump may be weak, the intake doesnt look too dirty, let me go look at the 98.

[Wicked Mayhem]

yeah i was talking with Deeze49686 and he said its the pump cause it should be around 58 while cranking.

i see yogi!

[lesterl]

I just checked, Mine has a blacker than sin build up on everything.

[lesterl]

Yeah, the pressure dont look good.

[Wicked Mayhem]

would it be ok to just put on an msd fuel pump that mounts to the frame? i can get it for 94 dollars. ive had them on my past 2 trucks with no problems.(89 s10 4.3 and 91 ranger 4.0)

[lesterl]

Depends upon the pressure and the flow characteristics, but I guess if you find one that will work it would work.

[lesterl]

Have you cleaned your intake recently? It was pretty clean from what I could see. Especially compared to mine.

[Yogi]

Chris -

You've got good pressure at key on engine off. It drops to 50 when you start cranking. That looks like it could be a wiring problem. Looks like the pump is not getting enough power while cranking.

I would check the fp ground on the frame rail - driver's side. Take the connection apart and sand all surfaces, reassemble.

Next, disconnect the fp wiring harness and look at the plugs real close. Look for dirt, corrosion, or a burned connection. Clean if necessary and try the gauge test again.

Also try changing the fp relay with another known good relay in the box.

The way that the pressure is in the vid, I'd be afraid that a new pump would do the same thing.

[lesterl]

X2^^^ Yogi da man.

[Wicked Mayhem]

Quote: Originally Posted by Yogi

Chris -

You've got good pressure at key on engine off. It drops to 50 when you start cranking. That looks like it could be a wiring problem. Looks like the pump is not getting enough power while cranking.

I would check the fp ground on the frame rail - driver's side. Take the connection apart and sand all surfaces, reassemble.

Next, disconnect the fp wiring harness and look at the plugs real close. Look for dirt, corrosion, or a burned connection. Clean if necessary and try the gauge test again.

Also try changing the fp relay with another known good relay in the box.

The way that the pressure is in the vid, I'd be afraid that a new pump would do the same thing.

thanks yogi! im gonna go try that right now. i guess i will have to drop the tank to check the plugs? ill get it in the garage and check it out.

[Yogi]

Quote: Originally Posted by Wicked Mayhem

would it be ok to just put on an msd fuel pump that mounts to the frame? i can get it for 94 dollars. ive had them on my past 2 trucks with no problems.(89 s10 4.3 and 91 ranger 4.0)

Click here for a thread on how to install the MSD fp.

[91sonomast]

you were showing prices for entire fp modules, get the pump number while u have it apart and buy just the pump, u dont need a whole module, i dont think u would.

[Wicked Mayhem]

well thats just my luck.. i go to drop the tank to check out all the wiring, it all checks out fine, go to jack it up and somehow the tank slipped off the jack and ripped all 3 lines off with part of the fuel pump.. so i had no choice but to go buy a fuel pump. bought one from advance. one year warranty. not one i wanted but its my only vehicle so i had to do something. ill let it sit for a while and hopefully that was the problem. this one is alot quieter.

[Yogi]

Man, that sux!!

Hope that you have better luck with the new one!

[Wicked Mayhem]

Quote: Originally Posted by Yogi

Man, that sux!!

Hope that you have better luck with the new one!

thanks! i hope i do too lol.

[black_ice_02]

man blazer tanks suck, i've done it a few times, not alot of room.

Hope that fixes it though

[Wicked Mayhem]

wasnt bad, i got it out fine.. well it fell out lol dad i got new pump in and connector changed, dad fished the filler neck up through and i lifted the tank into place.

[Yogi]

So how does the new pump run? Did the starting pressure come up?

[Wicked Mayhem]

i still have the problem i did.. i havent got around to checking the pressure. i have a new fuel filter for it, so im going to change that tomorrow and check the pressure. i was real lazy today. figured might as well be, dont get paid mondays off alot lol..

but it runs like normal when started. i cleaned the frame to bare metal for the grounds. the connections are good. ill make a video of it starting tomorrow morning. it may not be bad, but it used to not crank as long as it does before starting.

so i will report back with updates around lunch time tomorrow..