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2000 2500 sierra 6.0L

Confirming failure of fuel pump

2000 2500 sierra 6.0L

Postby ndngary [OP] » May 11 2012, 7:40pm

How do I confirm fuel pump failure? Gas guage is faulty, (reads empty then normal on/off). Changed fuel filter, oil pressure shows normal while cranking, replaced relay. Cranks over normal, sometimes coughs or starts for a second then nada.
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Re: 2000 2500 sierra 6.0L

Postby DeathSlinger00 » May 24 2012, 2:32am

sounds like two separate problems, but still related to one another.

-the issue with the fuel gauge is most likely the fuel level sender is failing. its sold separately from the fuel pump assy. but, you will unfortunately have to pull the pump to replace the level sender, as it is mounted to the side of the pump.
-the "coughing" issue may be the pump itself. you should check fuel pressure at the rail.

depending on what you find, you're still going to have to pull the pump.
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Re: 2000 2500 sierra 6.0L

Postby bbrown » Jun 12 2012, 11:07pm

Agree with Dan. Drop the fuel tank and get the pump and the sender replaced...then see what happens.
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Re: 2000 2500 sierra 6.0L

Postby ASTE25 » Jun 12 2012, 11:17pm

As stated above, you may have good pressure but not enough fuel flow. The sending unit for the gauge is part of the fuel pump assembly. I would reccomend only using an AC Delco brand unit.
Last edited by ASTE25 on Jun 12 2012, 11:55pm, edited 1 time in total.
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Re: 2000 2500 sierra 6.0L

Postby DeathSlinger00 » Jun 12 2012, 11:27pm

^^^agreed. you get aftermarket, and you'll be doing it all over again in a couple of years.
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