Two part thread. Fuel pressure and weird thermostat pipe - S-10 Forum
 
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post #1 of 11 Old 06-25-2019, 05:13 PM Thread Starter
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Truck: 98 sonoma, 2.2l with 5 speed.

Till the waterpump incident recently, no issues but a hard start every once in a while.


My fuel pressure is a solid 38psi while running and it seems to generally hold when turned off but sometimes it seems to not build the pressure quickly wuen starting. Like i have to crank it for a bit and give it some pedal to get it to finally spin the engine up fast enough it starts.
Its not an all the time deal, just enough that i know it will happen once a day if i take the truck more than one place.

Sound like the check valve at the pump? The regulator seems to be working amd the fuel system will solidly hold 38 to 40psi if i let it sit for 5 minutes. Its sitting right now and still holding so i will watch it for a bit.

Oddly, this morning it started and seemed to be firing on only 3 cylinders. I attribute all these problems to the damn waterpump overheat incident from last week.

Also, what is the weird pipe the thermostat housing connects to? Its leaking, is why i ask. Right whete the pipe goes into the thermostat housing so you smell coolant and can see it weeping and dribbling when running. I am going to look on rockauto to see if they have it but i don't know what its called.

I am attempting to put up pics but they are always sideway.

Edit. After 10 minutes, pressure is at 36psi

Two part thread.  Fuel pressure and weird thermostat pipe-20190625_154942_1561497159889.jpg


Two part thread.  Fuel pressure and weird thermostat pipe-20190625_154316_1561497190961.jpg


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post #2 of 11 Old 06-25-2019, 07:17 PM
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Re: Two part thread. Fuel pressure and weird thermostat pipe

It's just a hard line for the heater. Don't bother with the Dorman.



https://www.rockauto.com/en/catalog/...r+outlet,10337


ACDELCO 1575226 {#12563996} GM Original Equipment


I needed a second fitting for my electric fan switch, so I tapped the housing and ran 1/2" stainless pipe instead. Overkill, but haven't had any issues since.






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post #3 of 11 Old 06-26-2019, 05:57 AM Thread Starter
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Re: Two part thread. Fuel pressure and weird thermostat pipe

is that pipe pressed in on the stock ones?

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post #4 of 11 Old 06-26-2019, 10:39 AM
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Re: Two part thread. Fuel pressure and weird thermostat pipe

Quote:
Originally Posted by superj View Post
is that pipe pressed in on the stock ones?

Yes it is.




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post #5 of 11 Old 06-26-2019, 12:27 PM Thread Starter
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Re: Two part thread. Fuel pressure and weird thermostat pipe

dang, what a bad deal.


I ordered a replacement so hopefully I will be back to good soon.


what an inopportune time to have this truck having cooling issues. my wife's car is at the dealership for stuff and the 92 s10 for my younger son still has the engine sitting in the garage so its not drivable.

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post #6 of 11 Old 06-27-2019, 03:47 PM Thread Starter
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Ok, leaks not fixed. Ita just so small that i cannot find it. I fill it up and everything is good but once i drive and park it, there is a damp spot under the truck if it sits the day while i am at work.

After driving, i can hear a tiny fizzle, where ever the leak is at, i just cannot find. I looked all over with the flashlight and in broad day light and i can't find it.

Anyone got an idea to a super hard to find spot for a leak

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post #7 of 11 Old 06-27-2019, 07:02 PM
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Re: Two part thread. Fuel pressure and weird thermostat pipe

Make sure it's not the head.




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post #8 of 11 Old 06-27-2019, 10:10 PM Thread Starter
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That is exactly what i am worried about

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post #9 of 11 Old 06-27-2019, 10:13 PM
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Re: Two part thread. Fuel pressure and weird thermostat pipe

Head gaskets are easy in these. You can buy a remanned head and all of the parts you need for under 500 bucks. Might as well throw in a timing chain while you're at it.




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post #10 of 11 Old 06-28-2019, 09:11 AM Thread Starter
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Re: Two part thread. Fuel pressure and weird thermostat pipe

if it ends up being that.


yesterday I retightened all the bolts on the thermostat pipe and checked all the ones around the water pump and spun her up with the cap off. since it has been leaking out so quickly, I stuck the hose in it and ran it for half an hour to try and flush any weird junk out and tons of brown crap came out. I put the cap on and let her get as warm as she would in the driveway, which ended up being a hair above the 1/4 mark. then I turned it off and threw a piece of clean card board under the engine for the night. this morning, there was nothing on it and the truck started up perfectly. I didn't smell anything when I got to work either, like previously.


so hopefully, retightening all the bolts maybe fixed it? some where not loose but they weren't as tight as the others. I didn't have a torque wrench so they went on until they stopped and then a bit more. I don't know, we shall see after work

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post #11 of 11 Old 06-28-2019, 08:08 PM Thread Starter
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She is done.

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