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Author Topic: K bike with fuel pump outside of the tank  (Read 7830 times)

Offline skepsis

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  • Posts: 4
K bike with fuel pump outside of the tank
« on: October 13, 2014, 05:18:08 AM »
Hi everybody,

I wonder if someone try to make a modification on a K75 or K100 to have the fuel pump outside of the tank. Do you have any suggestions / opinions that this will fail or not?

Thanks in advanced
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Offline billday

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Re: K bike with fuel pump outside of the tank
« Reply #1 on: October 13, 2014, 10:30:29 AM »
For starters, you'd need a different pump. The one that comes on the bike is cooled and lubricated by the gasoline it's immersed in.

Next question would be where to put it.
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  • New York State, USA 10977
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Offline kioolt

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Re: K bike with fuel pump outside of the tank
« Reply #2 on: October 13, 2014, 10:42:03 AM »
Next question - WHY?
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2018 R1200RT 8,000 miles,2004 R1150RT 189,000 miles
1991 K100LT 128,700 miles,1982 R100RT 106,900 miles
The cheapest thing on a BMW is the nut that connects the seat to the handlebars.

Offline Motorhobo

  • +25 years of K75
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Re: K bike with fuel pump outside of the tank
« Reply #3 on: October 13, 2014, 11:17:06 AM »
I'm reminded of the ball of flame churning out thick, acrid, black smoke I saw recently on the shoulder of the freeway that just minutes before had been a motorcycle...
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1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline racinrich

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Re: K bike with fuel pump outside of the tank
« Reply #4 on: October 13, 2014, 04:51:58 PM »
yah I saw that too it was a Harley with a bad carbonator  :hehehe  :hehehe
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Offline Dennis de Vries

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Re: K bike with fuel pump outside of the tank
« Reply #5 on: October 14, 2014, 02:22:24 PM »
Why wouldn't it work? Yes you'll need another pump, but there are plenty of cars driving arround with a similar injectionsystem so that shouldn't be a problem... Seen it done on an italian ratbike with a sporty tank, had done away with the airbox too, ran great!
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Offline Motorhobo

  • +25 years of K75
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Re: K bike with fuel pump outside of the tank
« Reply #6 on: October 14, 2014, 03:19:06 PM »
Yeah, but what's the advantage?
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1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline K75RT Keith

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Re: K bike with fuel pump outside of the tank
« Reply #7 on: October 14, 2014, 03:36:26 PM »
Anything can be done that you want to do.  The question is; What is the advantage or benefit?  Additional fuel capacity would be minimal.  Heat build up from pump is minimal as more heat enters the tank from the fuel in the return line.  Still have to find a place to mount it and then run the lines. 
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You can't help someone who doesn't want to hear the answer.

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Offline K75RT Keith

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Re: K bike with fuel pump outside of the tank
« Reply #8 on: October 14, 2014, 03:37:50 PM »
Quote from: Motorhobo on October 13, 2014, 11:17:06 AM
I'm reminded of the ball of flame churning out thick, acrid, black smoke I saw recently on the shoulder of the freeway that just minutes before had been a motorcycle...

That might have been my buddy's Ural.  Carbs leaked and turned it into a big ball o flames
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You can't help someone who doesn't want to hear the answer.

1990 K75RT

Offline wmax351

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Re: K bike with fuel pump outside of the tank
« Reply #9 on: October 14, 2014, 07:29:44 PM »
Quote from: K75RT Keith on October 14, 2014, 03:37:50 PM
Quote from: Motorhobo on October 13, 2014, 11:17:06 AM
I'm reminded of the ball of flame churning out thick, acrid, black smoke I saw recently on the shoulder of the freeway that just minutes before had been a motorcycle...

That might have been my buddy's Ural.  Carbs leaked and turned it into a big ball o flames


Russians see that as good. Warmth, even if brief.
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  • Albuquerque, NM
  • 91 BMW K75 Standard, 98 Moto Guzzi California EV
Bikes:
Current:1991 BMW K75 Standard, 1998 Moto Guzzi California EV11
Past: '83 BMW R65LS, '75 Honda CB550F, '69 Honda CB175, 1999 Royal Enfield Bullet 500, 1973 Triumph Tiger TR7V, 1971 BMW R75/5 in Toaster outfit, 1979 Harley Davidson XLS-1000 Sportster Roadster

Offline Chaos

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Re: K bike with fuel pump outside of the tank
« Reply #10 on: October 14, 2014, 10:36:24 PM »
Quote from: wmax351 on October 14, 2014, 07:29:44 PM
Quote from: K75RT Keith on October 14, 2014, 03:37:50 PM
Quote from: Motorhobo on October 13, 2014, 11:17:06 AM
I'm reminded of the ball of flame churning out thick, acrid, black smoke I saw recently on the shoulder of the freeway that just minutes before had been a motorcycle...

That might have been my buddy's Ural.  Carbs leaked and turned it into a big ball o flames


Russians see that as good. Warmth, even if brief.

OK, no more bashing BMW's bastard offspring.  Not polite to make fun of a living fossil.  And mine hardly ever catches fire, though I did mount an extinguisher in the trunk  :giggles
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline skepsis

  • Curious
  • Posts: 4
Re: K bike with fuel pump outside of the tank
« Reply #11 on: October 14, 2014, 11:22:41 PM »
Hi to all,

after research, it is not a very good idea because of serious disadvantages (like get fire). I just recently bought an abandoned K75S '86, and I rebuild it in a form of a cafe racer. After all the service staff that I made (oil change, spark plugs, clean of all contacts etc) I change the fuel filter also and I check is fuel pump works ok, and this idea came up to my head. After all the above discussions, I conclude that it is a bad idea.

Thanks to all for the comments
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