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no power to fuel pump. good fuel pump, relay and fuse. any ideas?

This is a discussion on no power to fuel pump. good fuel pump, relay and fuse. any ideas? within the Technical / Maintenance forums, part of the General Discussion category; hey i have a '90 with a tbi 350. I have no power to my fuel pump. i tested my ...

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    no power to fuel pump. good fuel pump, relay and fuse. any ideas?


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    hey i have a '90 with a tbi 350. I have no power to my fuel pump. i tested my pump, its good. fuse is good and i replaced the relay. Is the only thing left to check the wiring? If so there are five wires going to the relay. what should i look for when i use my test light?

    Thanks,

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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    Power goes from the oil pressure sending unit behind the distributor to the fuel pump If I recall.
    Last edited by AcezHi; 12-19-2010 at 06:47 PM.

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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    Does it never have power to the fuel pump, or will it prime when you turn the key on? If it primes, that means the pcm is not turning the pump on. Which usually means it is not getting the reference signal from the ignition module.
    94 Chevy K1500, 350 V8 extended cab stepside 4x4

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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    Yes my ignition module failed before and I nearly dropped the gas tank :). Found out it was that causing no power to my fuel pump.

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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    i just had similiar problems. replaced fuel pump and still no response. all lines had juice going through them and relays were good. but the fuel pump itself was not getting any juice. there is a wire that goes directly to the fuel pump. you have to take out the fuel pump from the tank to get to it. the connector to the fuel pump was melted. the previous fuel pump had shorted the wire out and melted the plastic casing. i used a knife to cut off the extra plastic. plugged the connector back into the pump itself and problem solved. make sure none of your wires are shorted out.

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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    the fuel pump never comes on. I have the bed off. the wire going to the pump never has power. where is the ignition module located?

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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    Under the cap of the distributor, it is the electronic part that has the harness connect to it.

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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    make sure the ground connection for pump is perfectly clean and clear. corrosion is a mothertrucker.

  9. #9
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    Re: no power to fuel pump. good fuel pump, relay and fuse. any ideas?

    O2 GMC RCSB 4.8L V8 AUTO 3.73's
    rebuilt/beefed up 4L60E(at 43,000miles)
    Matching Ninja 500r


 

 

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