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Thread: Bad Fuel Pump?

  1. #1
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    Default Bad Fuel Pump?

    Suspected bad "NEW" fuel pump. Have to prime pump for start,pressure drops to zero immediately upon key off.(suspect bad anti-backflow valve in pump assembly) Removed fuel pump from tank and and blew into output nozzle.There was no resistance. You think this is an indication of anti-backflow failure?

  2. #2
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    prerunner1982 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Bad Fuel Pump?

    Certainly sounds logical to me.
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    Default Re: Bad Fuel Pump?

    Pressure bleeding down is generally a bad back flow valve. Better take it back
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    Default Re: Bad Fuel Pump?

    Thank You. Your rapid response is appreciated.

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    Default Re: Bad Fuel Pump?

    Removed old fuel pump serviced it and put it back in. Fuel pressure went from 50 to 15 so that was a bust.Bit the bullet and bought new pump again. This one is working fine. After original pump stopped holding pressure when off, I got a replacement that also did the same thing, i returned for exchange and the exchanged one showed same symptoms so i figured it was a different problem. I troubleshot for a year. then decided to take pump apart to find anti back flow valve, I screwed pump pressure up and had to get a new one. New one works fine. It was defective replacements all the time.

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