Fuel Pump issues

Discussion in 'Technical & Maintenance' started by Wayne, May 15, 2018.

  1. Wayne

    Wayne Well-Known Member

    My brother has a Yamaha Midnight Star 1600, with the fuel pump not making the buzzing sound. Ordered a new aftermarket pump and the bike now fires up and idles perfect. BUT dies with any throttle. Any suggestions?
     
  2. RossKean

    RossKean Active Member

    Check fuel pressure ahead of injectors. Maybe the pump can't deliver? Is there a fuel filter in the system that could be plugged? The fuel pump on my FJR just whines/buzzes until the fuel rail is pressurized then it stops.
     
  3. Wayne

    Wayne Well-Known Member

    There is a new fuel filter as well. And yes the pump only makes the buzz sound for the first few seconds (normal). I could be wrong but I believe it has a carburetor(s).

    The old pump is confirmed to be not working, and the new pump does start the bike and idles, so I’m thinking the bogging is still related to the pump in some way? Dunno.

    And he’s in Ottawa, so I have no hands on time with it.
     
  4. RossKean

    RossKean Active Member

    Ok. I assumed it was FI. Must be a few years old. I had a 2004 Yamaha Roadstar that was carbureted - one single large carb for 1700 cc v twin. If carbed, I would look for a problem with the float or a gummed up needle. A good cleaning never hurts.
     
  5. sleepyhead65

    sleepyhead65 Member

    what he said
     
  6. Wayne

    Wayne Well-Known Member

    Yes, the carb could be the issue and maybe a coincident?
    -No bike issues when it was parked in the Fall.
    -The first start of the season the bike started, idled and rode fine.
    -The second start of the season, no fuel pump.
    -Has 12v at the pump which is probably an indication that the relay is working.
    -New aftermarket pump installed and the bike starts and idles, but engine quits with throttle.
     
  7. Littlepeter

    Littlepeter Member

    If it's vacuum there may be hole in the diaphragm.
     
  8. Wayne

    Wayne Well-Known Member

    The new $70 aftermarket pump was the issue! He ordered another new pump, this time a $300 oem one and the bike is back to normal again.
     
    keith likes this.
  9. RossKean

    RossKean Active Member

    Great news - about the bike running, not the $300. Yamaha OEM fuel pump failures are pretty rare.
     
  10. sleepyhead65

    sleepyhead65 Member

    glad to hear it's sorted. quite the cliffhanger thread!
     

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