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Author Topic: Blowing fuel pump fuse  (Read 3562 times)

Offline Andy FitzGibbon

  • ^ Proficient Motobricker
  • Posts: 123
Blowing fuel pump fuse
« on: June 12, 2017, 08:42:58 AM »
Had the bike (85 K100RS) out for the first time in hot weather this weekend, and had hot tank/boiling fuel issues for the first time. So insulating the tank and lines is on the to-do list.


On the trip home yesterday, the bike blew three fuel pump fuses in roughly 100 miles. Finally switched to a 15 amp, because it was all I had, and that got me home. Pump and filter were new last fall. Have new lines waiting to go in (will install when i do the insulating).


I'm guessing the hot fuel may have had something to do with the fuse blowing- pump drawing more, ect. Other than insulating, and checking all electrical connections for resistance/corrosion, is there anything else I should be looking at?


Thanks,
Andy
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  • Montrose, WV
  • 1985 K100RS, 1972 R75/5, 2012 Suzuki DR650

Offline Martin

  • ^ Quintessential Motobricker
  • Posts: 4475
Re: Blowing fuel pump fuse
« Reply #1 on: June 12, 2017, 05:26:08 PM »

A few inmates had the same problem, they rectified the problem with a new pump. A Chinese copy of the OEM available on Ali express for around $30.00 US. I am about to order one from  https://www.aliexpress.com/item/for-BMW-K-Ducati-K75-K100-K1100-K1-1983-1997-BOSCH-16121461576-16121460452-0580-463-999/32784411992.html?  They look to be an actual manufacturer.
Regards Martin.

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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline K1300S

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  • Posts: 1293
Re: Blowing fuel pump fuse
« Reply #2 on: June 12, 2017, 06:31:44 PM »
what pump when into it last year?  could be bad pump, could be a wiring problem somewhere (have you cleaned out the tank connector for the pump?)
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Offline The Mighty Gryphon

  • Administrator
  • ^ Quintessential Motobricker
  • Posts: 6843
Re: Blowing fuel pump fuse
« Reply #3 on: June 12, 2017, 07:29:23 PM »
If there is a Harbor Freight handy you might want to pick up one of these handy little testers:

https://www.harborfreight.com/30-amp-automotive-fuse-circuit-tester-67724.html

Take some measurements with and without the pump connected.  That may help you learn if it's the pump or the wiring.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Andy FitzGibbon

  • ^ Proficient Motobricker
  • Posts: 123
Re: Blowing fuel pump fuse
« Reply #4 on: June 12, 2017, 08:56:46 PM »
Pump is an EnDuraLast from Euro MotoElectrics. Had absolutely no trouble with it until this weekend, which was A. the longest trip I've taken on the bike and B. the hottest weather I've ridden the bike in. Perhaps the pump was damaged by the heat of the fuel.


Cleaned the tank connector last fall, but I should do it again. I have a small ultrasonic cleaner that I can probably submerge the plug in.


Shoot, the town I was visiting on my trip (Harrisonburg, VA) has a Harbor Freight store... and I was there, twice. Have to pick one of those testers up on my next trip.


Thanks for the replies,
Andy



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  • Montrose, WV
  • 1985 K100RS, 1972 R75/5, 2012 Suzuki DR650
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