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Chevy Blazer Fuel Pump and Pressure Regulator Problems

208 messages,  Last post on Feb 20, 2013 at 1:03 PM

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What is this discussion about? Chevrolet Blazer, SUV

Messages Page 16 of 21

#149 of 208 help by bryonmax

Feb 06, 2010 (6:04 am)

i have a 1998 chevy blazer. my fuel pump went out. so i changed it and changed the pugs and wires. now it wont start so i use some starting fulid and it runs fine after that. been doing that for 3 months.now after a bad ice storm it dont wanna run it back fires thu the intake and when i give it gas while driving it wants to die and has no power i took it down and had auto zone run the check eng codes and i got back too rich and maf so i changed the maf and still nothing.

#150 of 208 ICM by duntov

Feb 06, 2010 (6:37 am)

Replace the ignition control module in the distributor. Always use new screws to hold it in place because they serve a the ground. The old screws can rust and lose the ground for the ICM. Always use StarTech.com silver thermal transfer compound paste on the ICM heat sink where the ICM rests on the heat sink in the distributor. It is sold on AMAZON or at any computer electronics store.
 
NEVER use dieletric silicone grease....dielectric silicone grease is a insulator. "Dielectric" means insulation. Dielectic grease will reduce the conductivity of heat sink connection and electronic connectors of all types. Silicone dielectric grease should only to be used as a sealer in the Weather tite electrical connectors and not on the metal parts of the connectors. ..

#152 of 208 fuel pump or pressure regulator by pops1956

Sep 19, 2009 (1:27 pm)

my wifes 2000 blazer had check engine light on. they did some kind of giagnostic on it and said it was a fuel system problem.it was running ok at the time and since they didnt seem to know what the issue was she just ran it. well today it wont start. just turns over .fuel pressure comes up normally at prime but wont hold,drops straight to zero. how do i distinguish between the pump, regulator or something else? thanks.

#153 of 208 Re: fuel pump or pressure regulator [pops1956] by marblaze

Oct 28, 2009 (7:04 pm)

Replying to: pops1956 (Sep 19, 2009 1:27 pm)
IT DOES NOT SOUND LIKE PRESURRE REGULATOR IT SOUNDS MORE LIKE CHECK VALVE IN YOUR FUEL PUMP OR THE CARBON FIBER LINE THAT IS IN THE TANK THEY ROT I HAVE SEEN THIS HAPPEN ALSO YOU COULD HAVE A SPIDER JET LEAKAGE I HAVE ALSO SEEN THIS AND IT IS HARD TO PIN POINT IT , ITS REALLY JUST A GUESSING GAME AS WHERE TO START.

#154 of 208 fuel pump wont shut off even with key off and fuel relay disconnected by mouthsmom63

Feb 21, 2010 (2:37 pm)

#155 of 208 2001 chevy blazer 4x4 by wominal38

Feb 25, 2010 (7:40 pm)

on my blazer the gas hand will say it has about a quarter if a tank, but when it reaches a quarter of a tank it is actually almost empty...its like its a quarter of a tank off...what is causing this and how do i fix it?

#156 of 208 '98, No power probs by mntnresq

Mar 02, 2010 (9:44 am)

Hi,
 
I have a '98 Blazer with about 140k on it. While I suspect a fuel prob, not sure it's a pressure issue. The pump runs the prime cycle fine, and it starts and idles with no problems, hot or cold. It has however, gotten increasingly bad with loss of power at more than about 1/2 throttle. It ran and accelerated fine as long as you stayed about 1/2 throttle or less, any more, and it would just fall on it's face. No, sputtering, no misses, just make more noise, and power would drop off dramatically. SES light was silent, though I know the fuel pump will not normally throw a code.
 
So, last night, I started it and let it run for a while to warm up while getting ready to go somewhere. Got in and took off, and now if you do much more than barely crack the throttle, it spits and sputters, and has no power at all. I limped it home at about 15 mph. SES did come on, though I have not been able to pull a code, since I am afraid to try to drive it anywhere which can scan it. If I had to guess, it's going to come up as a rich condition. Also have not been able to check the fuel pressure.
 
My thoughts are leaking CPI, MAF, TPS, or CPS/module. Throwing parts at it is not practical, nor viable with my current cash flow. Anyone have any other thoughts?
 
Also, I did replace intake gaskets about 2-3 months ago, during which I cleaned the throttle body, MAF, MAP, etc. The CPI did not show signs of leaking at that time.
 
Thanks

#157 of 208 Re: '98, No power probs [mntnresq] by mntnresq

Mar 02, 2010 (11:02 am)

Replying to: mntnresq (Mar 02, 2010 9:44 am)
Well, seems I was wrong. Just got in it to try to move it to get the other truck out. No prime, no start. Guess I shoulda seen it coming.. did the unthinkable, and filled it up when it was really low..

#158 of 208 Fuel Pressure Regulator by 97blazerowner

Mar 06, 2010 (2:23 pm)

I understand from other discussions and online research that to get to the fuel pressure regulator on my 97 Chevy Blazer I must first remove the upper intake manifold. Does anyone know why I have to drain the engine coolant when removing the upper intake manifold?

Messages Page 16 of 21

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