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Thread: Fuel Pump relocation R1100rs -Good idea?

  1. #1

    Fuel Pump relocation R1100rs -Good idea?

    Hello everybody.

    I am going to have to go go inside the tank to (at least) change some of the lines that are inside due to a slow leak when that tank is at least half full. It looks like thay are degraded with age.

    At that time, I am considering doing the fuel filter relocation to facilitate future fuel filter changes.

    So, in a vain attempt to complicate my life, I keep wondering, hey, why not relocate the fuel pump to an outside the tank one so that I do not have to go inside the tank ever again....

    So anyone has done this? Good idea?. I have not seen any threads about it, which probably means it is NOT a good idea, but thought I would ask...

    TIA.
    Last edited by airhead78; 08-12-2011 at 03:31 PM. Reason: fat finger

  2. #2
    rabid reader dbrick's Avatar
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    I've never heard of this being done. The filter mod came from riders' experience of having the filter clogged by as little as one dose of watered gas, and having to change it on the road. I imagine the reasons not to move the pump are 1) it'd be a much more complicated job than merely moving the filter, harder to fit both inconspicuously and safely, and 2) the pump and interior lines are often life of the bike parts. They're much less likely to need attention than the filter.
    Last edited by dbrick; 08-12-2011 at 05:41 PM.
    David Brick
    Santa Cruz CA
    2007 R1200R

  3. #3
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    OEM fuel pump utilizes fuel for cooling; i would think an external pump, unless you go to some alternative pump) would be a bad call.
    Ride Safe, Ride Lots

  4. #4
    Quote Originally Posted by bikerfish1100 View Post
    OEM fuel pump utilizes fuel for cooling; i would think an external pump, unless you go to some alternative pump) would be a bad call.
    Yes, it would have to be a non-OEM pump designed for outside.

  5. #5
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    Electric fuel pumps for external use are/have been pretty common. We used to use them on a lot of cars. When fuel injection became so common they went inside.
    They sure make diagnosis and maintainence a lot easier.
    '03 R1150R, '03 F650GS, '97DR200SE,'78 Honda CT-90, '77Honda CT-90

  6. #6
    rabid reader dbrick's Avatar
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    The external pumps I remember from years ago fed carbs, and worked at much lower pressure than required by modern FI systems. I wonder if putting the pump in the tank had something to do with the increase in system pressure.
    David Brick
    Santa Cruz CA
    2007 R1200R

  7. #7
    Quote Originally Posted by Acejones View Post
    Electric fuel pumps for external use are/have been pretty common. We used to use them on a lot of cars. When fuel injection became so common they went inside.
    They sure make diagnosis and maintainence a lot easier.
    Yes that is why I was wondering. My 97 FI guzzi has an outside the tank high pressure pump. Later on, like BMW, MG also went to an inside the tank pump with all kind of similar hose issues.

  8. #8
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    It would seem that if you could find an external pump with the proper pressure specs it would work.
    '03 R1150R, '03 F650GS, '97DR200SE,'78 Honda CT-90, '77Honda CT-90

  9. #9
    Leave the pump. Install metal tubing cut to length to replace the filter inside the tank. Install the filter external per the OP but not the original title. Use injection grade new 7mm hose to run pump to filter and filter to manifold to regulator.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  10. #10

    Thank you for all the replies

    Thank you all for the replies.
    I will follow the advice given and the KISS principle and just replace the hoses and relocate the filter.

    Eduardo.

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