Runs rough at start up

Tiny
KEVIN MARLOW
  • MEMBER
  • 2002 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 275,000 MILES
Seems to be worse under one-fourth tank. Black smoke when accelerating. Black carbon with moisture coming out of tailpipe.
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Monday, June 6th, 2022 AT 4:31 PM

1 Reply

Tiny
KEN L
  • ADMIN
Yes, this happens when the fuel pressure starts to get low due to a weak fuel pump or clogged fuel filter if your truck has one. To be sure, here is a guide on how to check the fuel pressure and instructions on how to change the fuel pump out if needed, if you are going to get a new fuel pump unit, please get an AC Delco unit from Rock auto they are a few dollars more but worth it.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here is how to change the fuel filter out with instructions after the fuel pump images below:

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Tuesday, June 7th, 2022 AT 9:28 AM

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