04 Denali, long cranking before starting

Discussion in 'Engine & Drivetrain' started by mhorn0817, Aug 10, 2018 at 9:50 PM.

  1. mhorn0817

    mhorn0817 Full Access Member

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    Last week my truck started acting up. Its taking longer to start but it does eventually start. Also if you turn it off and start it right back up then it starts right away. Also there is a strong gas smell but no visible leaks. What could it be?
     
  2. Tonyrodz

    Tonyrodz Full Access Member

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    I'm guessing fuel pump. Have you checked your cranking fuel pressure?
     
  3. sumo

    sumo dn ʇǝƃ ʇuɐɔ & llǝɟ ı

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    Yea have fuel pressure checked.
     
  4. mhorn0817

    mhorn0817 Full Access Member

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    Havnt checked. What should it be?
     
  5. Rocket Man

    Rocket Man Sometimes A Dumbass Supporting Member

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    Your FPR could be letting the fuel pressure bleed off when you turn the truck off. Not sure if yours is on the fuel rail or on the pump itself. If it's on the pump, the whole unit (pump and FPR) has to be replaced. Mine was doing that on my 02 and I bought a FPR rebuild kit. As long as it wasn't turned off for too long, the pressure held. Mine's a return system so it just bled into the return line. Try cycling the key to on a couple times before engaging the starter and see if it fires right up that way. Not sure what the pressure should but yes perform a test. You should be able to see if it's bleeding off that way too.
     
  6. mhorn0817

    mhorn0817 Full Access Member

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    My fpr is on the pump. Ill rent a fp tester and rest it out today
     
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  7. iamdub

    iamdub Content may not be suitable for all audiences

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    FPR or check valve on the pump. Since smelling gas, I'd say FPR is leaking. Next time you go to start it after it's been sitting for a while, turn the key "on" (not start), then off, then on, off, then straight to start as normal and see if the engine starts much faster with less cranking.
     
  8. mhorn0817

    mhorn0817 Full Access Member

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    Would i still have a gas smell with a intake fpr?
     
  9. mhorn0817

    mhorn0817 Full Access Member

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    *In tank
     
  10. iamdub

    iamdub Content may not be suitable for all audiences

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    I've never heard of the FPR being on the pump module, but I've never had a reason to look into that, either.

    I'd say you'd smell the fuel more if it was on the intake manifold. I don't see how you'd smell the fuel leaking from an in-tank FPR that's leaking into a tank full of fuel.

    Pop the hood and take a sniff, particularly on the top drivers side of the engine.
     

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