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cranks/no start unless

Discussion in 'Engine & Performance' started by dick strough, Mar 28, 2019.

Sponsored By: Moe's Performance
  1. dick strough

    dick strough Member

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    Had this 01 Laramie 360, 160k mi. for a yr. Before that my newest truck was a 67 chevy so I'm not familiar with all the sensors,relays ect. Today truck cranks but won't start unless you squirt gas in carb. Runs, idles fine. Shut off, may restart 2,3 times then have to squirt gas again. I was told it's probably not the fuel pump, but the pump not getting a message to pump until it starts. I looked in the no start threads but didn't find this exact problem. Thanks,Dick
     
  2. jessyj

    jessyj Senior Member

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    Ya that's not a carb its a throttle body. And I would say the fuel pump is shot.
     
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  3. DodgeTx

    DodgeTx Senior Member

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    See if you can pull any codes with the key on key off method, a fuel pump online is about $35, cheap thing to rule out that could potentially solve your problem.
     
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  4. dapepper9

    dapepper9 Senior Member

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    Well when you turn the key on the pump will prime and this will emit an audible buzz.

    Just turn the key on and see if you can hear it prime, door open helps. This will decide whether you start looking at sensors or the fuel pump
     
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  5. DodgeTx

    DodgeTx Senior Member

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    ^This works^ Helped me on another vehicle, ended up having a bad sensor not allowing the fuel pump to "Prime" new sensor started right up.
     
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  6. dick strough

    dick strough Member

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    Going to ck for the pump buz and key codes now. Where is the pump prime sensor located?
     
  7. dapepper9

    dapepper9 Senior Member

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    The sensor that would possibly be at fault is going to be the cam position sensor which controls injector timing.

    Big thing to start with is see if its priming. If it is, your injectors likely aren't firing which is where the cam sensor comes into play
     
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  8. dick strough

    dick strough Member

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    Turned key on, heard buz for couple sec. Repeated heard buz again so tried starting. Started right up. Waited 5 min, started 4 times then just cranked. Turned key on , heard pump turned on off 3 times, started. Seems when I turn key on/off at least 3 times and each time I hear the pump(have not failed to hear pump each time) it starts. Would that be fuel pressure problem?
     
  9. dapepper9

    dapepper9 Senior Member

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    That's great news and narrows it down well. Sounds like the pump isnt maintaining pressure and the regulator is part of the pump
     
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  10. dick strough

    dick strough Member

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    Pulled the pump relay in fuse box under hood. Turn key on ,no pump sound. plugged back in get pump sound. So need to listen for pump sound each time I try to start. It has not failed to start as long as the sound is there. Could be intermittent relay?
     

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