98 Chevy 1500 5.0 Wont Start Cold

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by derek98z28, Nov 15, 2011.

  1. derek98z28

    derek98z28 New Member

    I have a 1998 Chevy Silverado 1500 5.0 305 4x4. When i sits overnight or for a long time it will turn over fine but will not fire up. changed plugs, wires, starter, battery, battery cable to starter. Turns over just fine and fuel pump sounds healthy but will not fire up and run, UNTIL i put jumper cables on it and fires right up....??? and after i drive it and it warms up i can turn it off and start it just fine
    Last edited: Nov 15, 2011
  2. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    Maybe check your ground.
  3. derek98z28

    derek98z28 New Member

    already did

    ---------- Post added at 01:09 PM ---------- Previous post was at 12:58 PM ----------

    could it be fuel pump? people are tellin me that but i dont think so cause why would jumper cables make it start
  4. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 Posts

    Welcome to the club, Derek. Have you checked your fuel pressure? If the fuel pressure drops it will be hard to start until the f/p builds up. Maybe by the time you jump it the f/p has built up enough to start the truck. Does this happen after the truck has sat for awhile like overnight?
  5. RedneckRucker16

    RedneckRucker16 New Member

    Check ur grounds and ur fuel pressure. Try turning the key to run and let it sit there for 10-15 seconds then crank it. If it fires up you need a fuel pump. Also check the vacuum on your fuel pressure regulator

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