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Chevy 2500 duromax 6.6 LB7 2500 wont start . vacuum pump wont hold pressure

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  • 486 Answers

Vacuum pump won't prevent it from starting but there are many many other issues that will cause this problem. You're probably going to need to take this to an expert in a shop that has a high quality bi-direction scan tool and the the diesel experience to get it to run again.

Posted on Oct 15, 2019

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Posted on Jan 02, 2017

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Anonymous

SOURCE: 6.6 diesel LB7 oil

Derek.

it takes 10 quarts of oil in 15w40. I have the same year GMC and i have had no issues other than my carrier bearing went out today.

Posted on Aug 02, 2008

Anonymous

  • 116 Answers

SOURCE: 1999 chevy blazer wont start

THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

Posted on Apr 11, 2009

JThruster

  • 118 Answers

SOURCE: 2000 chevy express 5.0 2500 series starts,runs and

Try swapping out the fuel pump relay, if thats good try testing your ignition system components. Start with the module and coil pack. If they are ok check the crank position or cam position sensor (which ever applies).

Posted on Apr 23, 2010

jharvey572

Chris Harvey

  • 447 Answers

SOURCE: This is what has been

try checking the jets in the carb ,check vacuum diaphram

Posted on Aug 03, 2011

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THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

Apr 11, 2009 | 1999 Chevrolet Blazer

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