Question about 2003 GMC Sierra 2500HD

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2003 GMC Sierra Diesel Truck needs to crank over for 5 to 15 seconds before it starts (evan in warm weather). Don't know whats wrong.

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Need to have lift pump volume output chkd. sounds like possible fuel starvation issue.

Posted on Nov 16, 2009

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1 Answer

GMC Sierra 1500 6.2L Diesel


Check your glow plugs fuse first then have it look at by a pro.

Apr 09, 2013 | 1995 GMC Sierra

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I have a 2008HD GMC Sierra 4WD Diesel - I need power for my new pillar gauges. Which fuse in the cab fuse box will supply keyed accessory power and no power during ignition/cranking?


depending on what brand and style of gauges you use, you might want power with the key in the start position. I have Autometer electric gagues in my Ford diesel and the power is "on" anytime the key is on or in the start position. If you don't need power during the cranking cycle, then I would probably use the radio fuse.

Aug 29, 2011 | 2008 GMC Sierra 2500HD 2WD

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My 2002 GMC Denali XL doesn't like to start on the first crank (especially in warm weather). Typically it starts on the second crank. I have cleaned the throttle body valve, MAF, replaced the battery and...


the fuel filter would be the first place i would go, especially if it has not been replaced recently. it can cause slow priming of the fuel pump, resulting in hard starting. in addition, if your truck has never been tuned up, a set of spark plugs could make the world of difference - i believe on your particular truck it is recommended to change them at least every 100,000 M. good luck!

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Excessive black exhaust on 2003 GMC Sierra Duramax Diesel.


This is what i would try (cheapest first) redexe/wyyns
injector cleaner,double dose,then i have put 1gal gas in 10gal diesel to increase burn temp (you may encounter a hot start problem temporarilly)then if still smoking, get a compresion check on the engine(this will tell you volumes)
by the way the NATO tanks put in 1/3 gas in diesel to stop it freezing in arctic conditions.any more than 1/3 can result in problems.

Mar 17, 2010 | 2003 GMC Sierra

1 Answer

Yes I have a 1998 GMC Sierra K1500 5.7 4x4 It


I don't really think it matters what state you live in they both have the same kind of weather, i know because i have lived in both, your problem is most likely fuel related, chanses are its either a fuel filter or fuel pump problem, either filter is pluging up or the pump is weak. Best thing to do is chg. the filter and do a pressure test on the pump

Dec 05, 2009 | 1998 GMC Sierra

1 Answer

Difficult starting in warm weather


Check the vacuum hose attached to the fuel pressure regulator under the hood next to your intake pull it off and see if any fuel is present, if there is replace regulator.you may have to tap hose with your finger to get any fuel out or start vehicle run until hot then shut off and recheck if no fuel present in vacuum line let me know and we can try something else.

Aug 23, 2009 | 1999 GMC Sierra

2 Answers

2007 sierra wont start


Pull the starter out and bring it in to the auto parts store to get it tested

Apr 06, 2009 | 2007 GMC Sierra 1500

1 Answer

02 GMC Sierra Diesel


i would change the fuel filter i had the same issue on a 01 chevy duramax. as well as put some 911 emergency in the tank. you get that any auto parts store.

Jan 29, 2009 | 2002 GMC Sierra

2 Answers

Truck just shuts off


I own the same 3500 GMC 6.5 diesel truck with the same problem. We replaced the brain under the upper turbo hood and it fixed it pronto. No more shutoffs

Dec 07, 2008 | 2000 GMC Sierra 3500

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