» » »

GMC Q&A

Ask Your Question

2001 GMC Sierra 1500 Question: after sitting over nightwill not start on first try but starts on second try

 

Question

monte576, 5.3L V8, Saint Paul, MN, September 02, 2012, 08:41
 Rookie

seems like it is not getting gas on the first try,once it starts then I turn it off it stars fine it only starts hard after sitting over 8 hours it has anew fuel filter

3 Answers
Flag This
  • Answer #1

    mastertech6371 September 02, 2012, 09:48
    Profile_thumbnail
     Master

    sounds like a fuel pump that has lost its prime. have the pressure checked first thing in the moring to verify.

    Roy

    Flag This
  • Reply

    monte576, September 03, 2012, 05:52
     Rookie

    that what I was thinking do I need to change the fuel pump to fix this

    Reply
    Flag This
  • Answer #2

    ziptie12 September 02, 2012, 10:24
     Master

    Pressure regulator?

    Flag This
  • Reply

    monte576, September 03, 2012, 05:52
     Rookie

    where is the regulater,how do I test it

    Flag This
  • Reply

    ziptie12, September 05, 2012, 09:08
     Master

    Should be on the fuel rail on the side with return line to fuel pump. I'm not sure what adapters you'd need for that year set-up. parts store may have basic pressure guage kits with the adapters and what they work on. Might want to pick up a Haynes or chiltons manual for a little better guidance and for the specifications (both running and shut-off after sitting-generally 10 min.). Also the pressure regulator should have a vacuum line to it , If that line has fuel in it when you pull it off , generally that's a sign of failure. HOPEFULLY if I'm giving you any mis-information , somebody will kick in with a reply stating that! Good luck.

    Reply
    Flag This
  • Answer #3

    Xrayxb808 November 19, 2012, 21:39
     Rookie

    Install a fuel pressure gauge to the service port on the fuel rail, turn ignition to run in order to prime the fuel system. Watch the fuel pressure gauge after you have successfully primed the fuel system, wait for about 5-8 minutes and watch the gauge. If it drops more than 5psi in a couple of minutes or if it drops to zero, then the fuel pump module needs to be replaced. Has a bad pressure check ball that is allowing the prime to be lost.

    Reply
    Flag This