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Thread: Oops, switched the fuel pump hoses!

  1. #1

    Oops, switched the fuel pump hoses!

    After replacing the fuel filter on my 2000 r1100rt I switched the two fuel pump hoses where they connect to the fuel pressure regulator. I even marked them and I still got them wrong way around! Anyway, I tried to start the engine before I realized my mistake. I'm wondering if I may have damaged something when the fuel pump tried to pump 45 psi into the wrong end of the fuel pressure regulator. Once I switched the hoses the bike started and seemed to run OK at first. About half a tank of gas later I have poor idle during warm up. Also, it seems like my fuel consumption is up significantly. Any thoughts? I can't believe I'm the only one who ever did this. Should I be concerned about the FPR or look for causes elsewhere?

  2. #2
    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by 196040 View Post
    After replacing the fuel filter on my 2000 r1100rt I switched the two fuel pump hoses where they connect to the fuel pressure regulator. I even marked them and I still got them wrong way around! Anyway, I tried to start the engine before I realized my mistake. I'm wondering if I may have damaged something when the fuel pump tried to pump 45 psi into the wrong end of the fuel pressure regulator. Once I switched the hoses the bike started and seemed to run OK at first. About half a tank of gas later I have poor idle during warm up. Also, it seems like my fuel consumption is up significantly. Any thoughts? I can't believe I'm the only one who ever did this. Should I be concerned about the FPR or look for causes elsewhere?
    The way you rigged the hoses, the pressure on the back side of the regulator was probably 100 PSI, where it is normally 0 PSI. You were, in effect, forcing the regulator shut with a lot of pressure.

    I don't know if the fuel pressure regulator can be damaged by switching the hoses, probably not but you can check it with a fuel pressure gauge on the lower hose going to the fuel distributor. The pressure in the lower hose (fuel supply) should be around 43.5 PSI. Then after you confirm pressure,

    The other thing that can happen if you didn't tighten the clamps on the in-tank hoses is that the hoses can be blown off the fittings in the tank, and if the hoses are old, they can rupture. You can check this by measuring the flow of fuel in the return line going from the fuel distributor back to the tank (upper hose). The spec is 2 liters per minute at idle.
    RB

  3. #3
    I did it once a few years ago. The bike still runs fine many tens of thousands of miles later. One data point.
    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/

  4. #4
    Registered User rxcrider's Avatar
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    Two data points - First time I put my bike together, I did it. No issues with it since.

  5. #5
    Pepperfool GSAddict's Avatar
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    Interesting that the regulator allowed fuel to flow backward and the bike actually ran.
    Rogers suggestions are a good idea.
    '
    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

  6. #6
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by GSAddict View Post
    Interesting that the regulator allowed fuel to flow backward and the bike actually ran.
    Rogers suggestions are a good idea.
    Can't see how it could run with the lines reversed. ??

    If I read it right the OP stated the bike ran _after_ he put them back the right way.
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

  7. #7
    Pepperfool GSAddict's Avatar
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    Quote Originally Posted by happy wanderer View Post
    Can't see how it could run with the lines reversed. ??

    If I read it right the OP stated the bike ran _after_ he put them back the right way.
    Ahhh, that makes sense, only thing to mention - a deadended fuel pump makes a very nasty noise at 100psi+ (I tested one)
    '
    Ufda happens..........

    Need your R11xx Hall sensor rewired? PM me.

  8. #8
    When I did it, it popped a hose off the fuel filter. I hooked that back up, corrected the two hoses, and got on with life. It was Ara's bike and we both had a good laugh after a bit.
    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/

  9. #9
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by 196040 View Post
    Any thoughts?
    Welcome to the forum!
    Gary
    "You can do good or you can do well. Sooner or later they make you choose." MI5
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    2009 F800GS 1994 TW200

  10. #10
    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by GSAddict View Post
    Interesting that the regulator allowed fuel to flow backward and the bike actually ran.
    Rogers suggestions are a good idea.
    The reason it could start is that the return hose supplied fuel at atmospheric pressure and the engine drew a vacuum on the other side of the injector so it had something like 14 psi across the injector. Enough to start but not much else.

  11. #11
    Day Dreaming ... happy wanderer's Avatar
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    Quote Originally Posted by roger 04 rt View Post
    The reason it could start is that the return hose supplied fuel at atmospheric pressure and the engine drew a vacuum on the other side of the injector so it had something like 14 psi across the injector. Enough to start but not much else.
    Well maybe... I hate to nitpick but here goes. The OP stated he _tried_ to start the engine with hoses reversed. Then once he switched the hoses right way round it started.

    I don't read anything that says it actually ran with hoses reversed.

    Maybe the OP can clarify?
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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