What could it be.......

[Frank Enstein]

An upstream O2 sensor past it's expiration date can cause excessive fuel to be injected. A bad ground on the O2 (low voltage) makes the computer see a lean condition that may not be real

 

[Wilecoyote]

I ordered the GM pump on Rock Auto, $210 shipped.The parts stores round here want $360 or more.I have a 98 S-10 v6 vortec I bought in 2000 w 42K.It suddenly clapped out a few miles from my house about a decade ago.Got my dad to pull it to my house.He was pulling me w his 4 runner and a 20' strap. He was driving about 35/40mph on the country roads and when we got to a stop sign near the house he slowed like he was just driving and not towing me. I about broke the brake peddle as I stood on it trying to stop before I hit him w no power brakes. We had a talk and got home.After it was parked i tried to start it again. The engine clanked,banged, shuddered, and shook the truck like it had 2 broken motor mounts.................a fuel pump fixed it.

 

[Wilecoyote]

Reve the engine and see what the fuel pressure does. It should come up as the engine RPS do. As for brand pump, AC Delco or Delphi ONLY. I put a cheap pump in years ago, and it lasted 3 months. I just replaced my FP last weekend. Took the wife and I 3 hours. Thats dropping the tank, and cleaning it out. I also changed the screen on the pump ( a must do with a new pump) and replaced the fuel filter. When I say 3 hours, thats from the time I jacked up the truck, to the time I put the rear tire back on, and lowered the truck, and fired it up. Total cost was just under $125. I did just the pump, not the assembly.

I cranked it the next morning again w the gauge and tried to rev it but half of the pedal had no change in the rpms, less than 1k.The guage also dropped below 60 psi.The pump came in saturday,5 days sooner than the expected delivery date.Had sunday off but it rained most of the day so no worky.I'll try to work on it friday.

 

[kennythewelder]

Ive never had an issue with mine, but another thing that will give those issues, is a bad fuel pressure regulator. Thats where reading what the fuel pressure gauge is telling you comes in. There is a video on you tube, where the guy punches the gas, engine running, and the truck just stumbles. Its starving for fuel. Its the fuel pressure regulator, not adjusting to the engines demands. He has good fuel pressure, its just not adjusting for the demand. All of the times I have replaced my fuel pump, my truck has always run a lot better once I replaced the pump. This last pump, lasted about 6 or maybe 7 years. Thats about average it seams in my experience.

 

[Wilecoyote]

Ive never had an issue with mine, but another thing that will give those issues, is a bad fuel pressure regulator. Thats where reading what the fuel pressure gauge is telling you comes in. There is a video on you tube, where the guy punches the gas, engine running, and the truck just stumbles. Its starving for fuel. Its the fuel pressure regulator, not adjusting to the engines demands. He has good fuel pressure, its just not adjusting for the demand. All of the times I have replaced my fuel pump, my truck has always run a lot better once I replaced the pump. This last pump, lasted about 6 or maybe 7 years. Thats about average it seams in my experience.

Good advice,If the new pump don't fix it I'll stuff a new spider down her throat with the new regulator.

 

[kennythewelder]

Good advice,If the new pump don't fix it I'll stuff a new spider down her throat with the new regulator.

If it comes to a new spider, take a look at the upgraded or up dated one. It moves the injectors to where the poppet valves are. If you dont already know about that. Just FYI.

 

[98chevy2500SS]

Get the MPFI (upgraded one) if you replacing injectors. About the same amount of money, just better.

 

[Wilecoyote]

Got it today

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[SUBURBAN5]

Got it today

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Where did you get that?

 

[Wilecoyote]

Where did you get that?

Amazon prime 2 days ago. rock auto had it for $5 less but they have shipping fees. Right now on amazon prime they are 268.03 and free shipping.