Results 1 to 13 of 13

Thread: K75 Hissing noise from fuel tank

Hybrid View

  1. #1
    Registered User
    Join Date
    Sep 2012
    Location
    Howell, Michigan
    Posts
    5

    K75 Hissing noise from fuel tank

    I have a K75 1992 with 48K miles. I parked it for 2 weeks in the garage, it was running fine. Sunday, I started the bike and a hissing sound is coming from the gas tank, it sounds like a air leak. I pulling the fuse for the fuel pump and the sound quit the motor ran 2 seconds and then died. Put the fuse back in and the sound came back. Today I removed the gas tank filler cap everything looks clean and in good order. With the cap off I started the engine and the sound is still there. If you put your ear on the tank the sound is louder on the left side which is the side were the pump is located. I felt the rubber fuel line feeding the fuel rail and you can feel the fuel pump pulsing but at a totally different frequency then what sounds like air hissing. The sound does not change with RPM.
    I'm thinking that it is the fuel pump but before I buy one for $230 does anyone have another idea of what it could be? Thanks, Dan

  2. #2
    Registered User kgadley01's Avatar
    Join Date
    Dec 2006
    Location
    South Carolina
    Posts
    3,535
    Quote Originally Posted by DanK75 View Post
    I have a K75 1992 with 48K miles. I parked it for 2 weeks in the garage, it was running fine. Sunday, I started the bike and a hissing sound is coming from the gas tank, it sounds like a air leak. I pulling the fuse for the fuel pump and the sound quit the motor ran 2 seconds and then died. Put the fuse back in and the sound came back. Today I removed the gas tank filler cap everything looks clean and in good order. With the cap off I started the engine and the sound is still there. If you put your ear on the tank the sound is louder on the left side which is the side were the pump is located. I felt the rubber fuel line feeding the fuel rail and you can feel the fuel pump pulsing but at a totally different frequency then what sounds like air hissing. The sound does not change with RPM.
    I'm thinking that it is the fuel pump but before I buy one for $230 does anyone have another idea of what it could be? Thanks, Dan
    How much fuel is in the tank??? when the fuel gets low on most older K-Bikes, you can hear the whine of the fuel pump. Fill it up and listen again.
    AKA SNAPGADGET
    Lifes too short to ride an ugly Motorcycle

  3. #3
    Registered User
    Join Date
    Sep 2012
    Location
    Howell, Michigan
    Posts
    5
    The tank had about 3 gal left in it with the sound then I fulled it to just below the flap still the sound.

  4. #4
    3 Red Bricks
    Join Date
    Jan 2007
    Location
    Pleasanton, Ca.
    Posts
    3,434
    Remove the filler cap assembly and look into the tank while it is running and making the noise. May be a split hose or a split filter.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  5. #5
    Registered User
    Join Date
    Sep 2012
    Location
    Howell, Michigan
    Posts
    5
    Good thinking. Yesterday, when I had the filler off the tank was full, I'll remove the gas to below the filter and look for a leak.

  6. #6
    Registered User Beemer01's Avatar
    Join Date
    Mar 2007
    Location
    Chicago, Ill
    Posts
    1,026

    +1

    check the fuel filter and internal lines - I've actually seen fuel filters split from either pressure or freezing with water in the tank.

    Way cheaper than a fuel pump.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •