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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