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Thread: How to determine Fuel pump health.

  1. #1
    Supporting Member II Turbo Mopar Contributor
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    How to determine Fuel pump health.

    I am looking how to determine my fuel pump health as it is 7 years old with 100K on the pump.
    I assume the main mode of failure is wear and its inability to pump at capacity and maintain pressure.
    Would a simple pressure test be good enough by pinching the return line?
    Thanks
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  2. #2
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: How to determine Fuel pump health.

    I pinch the return line and it usually tells the tale IMO.

  3. #3
    Supporting Member II Turbo Mopar Contributor
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    Re: How to determine Fuel pump health.

    Quote Originally Posted by cordes View Post
    I pinch the return line and it usually tells the tale IMO.
    Thanks Brian,
    What pressure do you expect to see in a healthy stock pump. !00psi ?
    Regards,
    Miles

    DD '87 Sundance T1, 12PSI, SLH with rear disks
    '87 CSX #432

  4. #4
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: How to determine Fuel pump health.

    Quote Originally Posted by chromguy View Post
    Thanks Brian,
    What pressure do you expect to see in a healthy stock pump. !00psi ?
    Yes, around 100PSI. Any pump I've had trouble with wouldn't make 90PSI for sure. I think the high pressure Walbro units have a relief at between 90 and 100PSI, but I've pegged gauges before too.

  5. #5
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: How to determine Fuel pump health.

    i whacked the relief on my walbro down tight so it doesnt have a relief anymore. lol

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  6. #6
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: How to determine Fuel pump health.

    Quote Originally Posted by Aries_Turbo View Post
    i whacked the relief on my walbro down tight so it doesnt have a relief anymore. lol

    Brian
    Are there instructions for that anywhere?

  7. #7
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: How to determine Fuel pump health.

    https://www.evolutionm.net/forums/ev...ng-walbro.html

    I remember a better one but i cant find it. the pics in the thread above are goofed up.

    the relief is on the top of the pump. youll see a hole with a metal plug with a hole in it down in there.

    ill keep looking.

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  8. #8
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: How to determine Fuel pump health.

    here is another thread talking about it as well.

    https://forums.neons.org/viewtopic.php?t=335983

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  9. #9
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: How to determine Fuel pump health.

    Thanks for the links. I'll have to think about that for the future. Although, if the pump requires that much pressure, the flow is going to drop off significantly. IIRC there is a graph on here somewhere showing the relationship.

  10. #10
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: How to determine Fuel pump health.

    Quote Originally Posted by cordes View Post
    Thanks for the links. I'll have to think about that for the future. Although, if the pump requires that much pressure, the flow is going to drop off significantly. IIRC there is a graph on here somewhere showing the relationship.
    yes flow will drop off but when the relief opens, flow plummets on walbros.

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  11. #11
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: How to determine Fuel pump health.

    Quote Originally Posted by Aries_Turbo View Post
    yes flow will drop off but when the relief opens, flow plummets on walbros.

    Brian
    Interesting. I'll block mine off totally when I install the next one.

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