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Thread: A more reliable fuel pump?

  1. #1
    JohnWC
    Join Date
    Mar 2010
    Location
    Akron, Ohio
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    722

    A more reliable fuel pump?

    91 k75s. I have had endless problems with the fuel system on this bike. I have now replaced everything in the tank, including a $280 fuel sender unit. The problem was that it kept blowing the fuel fuse. I have spent considerable time on this and have found the problem: the nearly new fuel pump locks up if the bike is not run for a period of time. (I realize this has never happened to anyone else, so we can skip that. I'm just lucky.) I won't go through all the testing, but believe me, the pump will do nothing but blow fuses, then, if I jump a 12 volt motorcycle battery directly to the pump, it will start up and run fine. I then reconnect the pump to the harness: it runs fine, no fuse blowing. The pump is the problem. It sticks just enough to keep it from turning. How this can happen, I have no idea. It's in filtered gas. It's a little motor with roller bearings in the bottom. I've had these apart, they're not that complicated.

    I bought the pump new from Euro Moto Electrics three years ago, and it has maybe 60 miles of run time, about 3 hours. This same issue has happened before with this pump. It is a 52mm Enduralast pump, $200 cost.
    I'll contact EuroMoto Electrics, but I already know what I'll hear: "We've never heard of that. We've sold hundreds of them."

    My question is, anyone know where I can buy a better pump, and preferably not a $400 BMW one? I would feel a bit stupid giving Euro Electrics another $200 for another quite possibly defective pump.

  2. #2
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Jan 2010
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    Mansfield,MA
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    16,837
    You could try some Mystery Oil in the gasoline- as a bit of lube.
    You could circumvent the bikes original wires and go directly to the bikes battery and use this to check the wiring loom/harness.
    At the age of the bike, it would be easier to have wiring and connections go bad and have more resistance than the fuse/circuit was intended to handle.
    OM
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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  3. #3
    Registered User
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    Apr 2020
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    EAST BAY FL
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    I put one of these in my k1100. So far so good. https://www.highflowfuel.com/quantum...s-16121461576/

  4. #4
    MOA #24991 Pauls1150's Avatar
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    Apr 2008
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    south of Los Angeles
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    3,077
    More resistance in the wiring causes current to go down, and not blow a fuse.
    On the other hand, a stuck or stalled pump motor will cause the current to go up, and blow the fuse.

  5. #5
    Registered User
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    Jan 2005
    Location
    Roanoke, VA
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    67
    Just an FYI, the fuel pump is before the filter. There is a Mustang fuel pump that fits but I don't know which one. Should be availible by many manufacturers.

  6. #6
    These pumps go for less than $30 on ebay:

    https://www.ebay.com/itm/15434215374...0AAOSwTIJfBCDE
    -Live as fully as you can as long as you can-

  7. #7
    Registered User
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    Aug 2018
    Location
    Fargo, ND
    Posts
    1,235
    I agree these pumps are shared with other vehicles. i had a 2003 Yamaha R1 and needed a fuel pump. I found some info on the internet and went down to the local auto parts and bought one for a Honda automobile. It was and exact match, right down to the wiring harness connection. Plus it was $60 instead of $500.
    From the only real Fargo, ND!

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