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Thread: No fuel past the injectors

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    MonsterDak's Avatar
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    Default No fuel past the injectors

    Went to go fire my truck and yea. Nothing.

    Have fuel in the rails and I have spark. Pulled a plug and no fuel smell. So it's most likely wiring. Any hints?

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    Quote Originally Posted by MonsterDak View Post
    Went to go fire my truck and yea. Nothing.

    Have fuel in the rails and I have spark. Pulled a plug and no fuel smell. So it's most likely wiring. Any hints?
    Have power to any injectors? Good place to start.

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    G-Man's Avatar
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    ASD relay or Fuse,
    G-Man

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    I'm pretty sure there's no power to the injectors. I checked fuses and relays and nothing looks bad. I have to look more tonight.

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    If your fuel pump runs with first key on the ASD circuit or "prime" circuit is ok. (for now) The PCM then needs to see an RPM signal on crank to turn the ASD back on and power up the coil, fuel injectors, fuel pump etc........

    Plug in a noid light into one of the injector plugs, hook up a fuel pressure gauge and a spark tester to one of the plug wires. Crank it and see what you don't have. Start with what you don't have.

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    Another quick and easy test... Key on, you should hear fuel pump run for a couple seconds then shut off

    Crank the starter. If CPS/ASD is working, as soon as you release the starter you should hear the fuel pump running for another couple seconds.

    If not, then start with the CPS sensor.
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    MonsterDak's Avatar
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    I checked for spark and it's good. Pump runs when I turn the key on.

    Friend of mine has a noid light but he works late nights until wensday. So I wouldn't be able to snag it until Thursday.

    I was thinking it might be the Cps. I have a bunch of good mopar ones and I'll swap it out and see what happens.

    I guess I'll just start going thru the list you guys gave me.

    Very frustrated, busted my balls for 3 weeks to get to where I'm at now and this happens. Oh well I'll try some stuff tonight and post up what happens.

    Thank you!!!!!!

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    MonsterDak's Avatar
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    Threw a Cps in and it's running. Thanks guys!!!!

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    What is a CPS and an IAC?

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    Just cps

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    Quote Originally Posted by dstoots View Post
    What is a CPS and an IAC?
    CPS -- Crank Position Sensor. It's what controls the ignition timing. And when the PCM stops seeing a signal from the CPS, it thinks that the engine has stalled out and isn't turning anymore, so it turns off power to the fuel pump, injectors, ignition coil. This is an anti-fire protection measure in the event of a crash, so that if you cut a fuel line in a collision, your fuel pump doesn't spray fuel all over the place at 43 PSI. When the CPS isn't working, nothing will work, and is often the first place to look when having issues with the engine not running.


    IAC -- Idle Air Control. It's the solenoid in the throttle body that opens and closes the air valve that controls idle speed. Unlike a carb, when the throttle blades are closed on the throttle body, (in stock configuration) no air gets to the engine and it won't idle.
    --Tom
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