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Old 03-12-2018, 01:11 PM   #1
MASONGMC
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2005 GMC 1500hd hard start problem.

Hi I have a 2005 GMC 1500HD with a 6.0 vortec and it seams to take a few time to get it running after it sits over nite. When I turn the key on to prime the fuel pump it makes it start better . I added a new coolant temp sensor and some extra ground wire and a new battery . The truck has 300000km is there any thing I should look at ? After I get it running it works good all day . I been looking at the fuel Schrader valve test port to check for leaks there . Have any body changed them on these trucks ?
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Old 03-12-2018, 11:55 PM   #2
RADustin
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Re: 2005 GMC 1500hd hard start problem.

the check valve is going out and fuel pressure is probably dieing off overnight.

You can cycle the key on and off a few times before starting it or change the pump assembly in the tank.
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Old 03-13-2018, 07:11 AM   #3
95 S_Trucker
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Re: 2005 GMC 1500hd hard start problem.

Or you have an injector/fuel pressure regulatorleaking down overnight

When the truck starts, how does it run? Smooth right away, or rough for a few seconds?
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Old 03-13-2018, 11:05 AM   #4
MASONGMC
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Re: 2005 GMC 1500hd hard start problem.

I think that is my problem. I need to get a pressure gauge on the fuel rail.I did replace the pump a few years ago . turning the key on and off is helping right now . I got bad gas this winter then my problem started .
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