Author Topic: Fuel pump runs indefinitely until cranked  (Read 2465 times)

Offline BrickdUp

  • Curious
  • Posts: 1
Fuel pump runs indefinitely until cranked
« on: October 19, 2024, 01:49:19 PM »
Hi all, new here, I have recently fitted a replacement fuel pump a few other items from a brand called quantum on my 1986 75S, after reasembling the system and testing that I’m infact getting fuel to the injectors I attempted to start, i then noticed that the fuel pump runs indefinitely until I crank the bike over, and then it stops, I cannot hear it running while I am cranking and when I let off the button after about a second it resumes, I can shut it off by using the killswitch on the bars or turning off the key, I have replaced the fuel pump as prior to this it would not run at all, may try refitting the original Bosch pump to see if I have rejigged something in the wiring and fixed the original issue, many thanks!
  • The driveway
  • Mangled 1986 K75S

Offline Ingo

  • ^ Motobrick Curious
  • Posts: 91
Re: Fuel pump runs indefinitely until cranked
« Reply #1 on: October 20, 2024, 08:12:21 AM »
So, with the pump working you should leave the pump for now and get into the wiring. There is a problem with power to the pump on while ignition is on but quits when engine turns over. This is a problem external to the pump. You'll need to get into the wiring, relays and switches...
  • Colorado Springs
  • 1992 K1100LT
You can't have everything; where would you put it?!

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