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Thread: fuel tap issues

  1. #1
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    Default fuel tap issues

    Hello folks any advice appreciated. I rebuilt the fuel tap on my gs850 with rebuild kit. The tap now hardly flows on prime, on, or reserve and engine wont start but overflows into engine overnight and leaks with oil from somewhere onto floor. Slight amount of petrol in oil. Dropped the oil and replaced but not sure what to do now because already rebuilt tap. The bike has just been recommisioned after sitting for a few years. I have cleaned the carbs. What to check or do next? Thanks

  2. #2
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    Default

    Also I have an inline fuel filter.

  3. #3
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    Baatfam is offline Forum LongTimer Past Site Supporter
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    You need an OEM fuel tap, (petcock), the rebuild kits don't work.

    And get rid of the fuel filter, not needed, and reduces flow.

    Welcome to the forum...
    Bob T.

    "That which you manifest is before you." -- Enzo
    "I always prefer to believe the best of everybody, it saves so much trouble." -- Rudyard Kipling
    "...for our existence to hold any value, it must end. To live meaningful lives, we must die and not return." -- Number Six

    '83 GS1100E ~ '01 TRIUMPH TT600 ~ '99 TRIUMPH TROPHY 900 ~ '67 HONDA CUB



  4. #4
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    On pri. all openings should be wide open, vacuum or no vacuum. Sounds like something didn't get put back together correctly. You may want to look in the carbs/fuel/exhaust section. There's a post down there from just a couple of days ago that may help. Like he said, you shouldn't need the fuel filter if the one on the pet cock is there & in reasonable condition.
    1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100

  5. #5
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    Hello thanks for the advice and now I see I put question in the wrong section. I cant find an oem fuel tap from Uk sources. They are available Usa ebay for over £100 shipped and taxed. Has anyone had luck with the cheaper aftermarket ones? Can source aftermarket for £17. Do you guys think I might have carb float valve issues aswell as the tap? Cheers Christopher

  6. #6
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    The cheap aftermarket ones are surprisingly nicely made, but they're rubbish at doing their job, with weak springs, etc.
    My 79 tank has a rebuilt (with OEM parts) petcock and it works well. The 80 bike has an adapter plate and a Harley petcock.
    ---- Dave
    79 GS850N - Might be a trike soon.
    80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
    79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
    92 XJ900F - Fairly Stock, for now.

    Only a dog knows why a motorcyclist sticks his head out of a car window

  7. #7
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    Quote Originally Posted by Christopher View Post
    Hello thanks for the advice and now I see I put question in the wrong section. I cant find an oem fuel tap from Uk sources. They are available Usa ebay for over £100 shipped and taxed. Has anyone had luck with the cheaper aftermarket ones? Can source aftermarket for £17. Do you guys think I might have carb float valve issues aswell as the tap? Cheers Christopher
    I bought this one and itís been fine for over two seasons now, through many a switch between prime, run and reserve.

    https://www.amazon.ca/dp/B07GSXY9PD/..._rv_eml_rv0_dp

    Perhaps they have a UK source?
    1982 Suzuki GS650G

  8. #8
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    That looks original, very good and cheap. An unusual combination.
    joepenoso

    2X 1979 GS Suzuki G

  9. #9
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    The cheap ones are a total crapshoot.
    I bought one a year or two back and while it seemed nicely made, it wouldn't shut the fuel off worth a damn. Weak spring in the diaphragm.
    No point in fiddling around trying to cure it, as I'd never trust it, and should it fail in use, I really don't want a crankcase full of fuel or five gallons dribbling down the workshop overnight.
    That got replaced by a strictly manual Harley aftermarket tap, on a plate adapter bolted under the tank. I'm now solidly in the habit of turning it off.
    ---- Dave
    79 GS850N - Might be a trike soon.
    80 GS850T Single HIF38 S.U. SH775, Tow bar, Pantera II. Gnarly workhorse & daily driver.
    79 XS650SE - Pragmatic Ratter - goes better than a manky old twin should.
    92 XJ900F - Fairly Stock, for now.

    Only a dog knows why a motorcyclist sticks his head out of a car window

  10. #10
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    Quote Originally Posted by Grimly View Post
    The cheap ones are a total crapshoot.
    I bought one a year or two back and while it seemed nicely made, it wouldn't shut the fuel off worth a damn. Weak spring in the diaphragm.
    No point in fiddling around trying to cure it, as I'd never trust it, and should it fail in use, I really don't want a crankcase full of fuel or five gallons dribbling down the workshop overnight.
    That got replaced by a strictly manual Harley aftermarket tap, on a plate adapter bolted under the tank. I'm now solidly in the habit of turning it off.
    After more than a decade riding vintage British where you always turned off the fuel tap it still rattles me when I just walk away from the GS without turning off the fuel.
    1982 Suzuki GS650G

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