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Thread: fuel pump assemby

  1. #1
    Baby Twin
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    fuel pump assemby

    hi ya all, after fixing my stator issue I got the bike running and i put the original cans on for the m.o.t and it ran like a bag of shit! stalled everywhere! at first i thought it was the standard can as it is set up for the mivv's but when i changed them back it still did it.
    I then thought the fuel filter has never been changed in 17000 miles so i decieded to change it. now i cant't start the bike!
    I may have put the filter in upside down as i failed to make a note of the flow direction, yes i know I'm a dick!!.
    so after removing the tank (again) would I be correct in thinking that the filter is after the pump? would seem a logical assumption! also there is a blue wire which apperars to have broken off, on the original filter it had a screw fitted to one side, does this attach there or above the second lower fitting (also blue) is this an earth?
    please help as Its doing my nut in!!
    many thanks
    steelprunes

  2. #2
    GP Champ
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    I`ve had a problem with the pump not working recently. I removed the pump and checked if it was still working .... it was. Problem ??. Read somewhere that it could be the wiring . Changed and replaced , all running now. I am more or less certain the blue wire goes to the plastic filter.

    Two blues come in ............. one goes to the black connector and the other one ................goes to the white connector and then on to the screw fix on the filter

  3. #3
    Baby Twin
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    thanks for the reply bud, I had another look last night and i found the electrical eyelet on the filter so you are right about that.
    I'm going to swop the filter round and hopefully that will be that.
    thanks again for your help m8

  4. #4
    Baby Twin
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    ok then went out this morning, changed the filter round and reconnected the blue wire to the filter and.... nothing!!! , could hear the pump working but would not fire up, then i got a service indicator on the dash as the battery died!
    WTF??

  5. #5
    GP Champ
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    I had to persist in starting the bike to get fuel through. A good charged battery helps , need to prime a few times.

    Sounds familiar , not starting. Like I said the pump worked so put all back together...........all OK taken and passed MOT then next day wouldn`t start so kicked it over and jumped on it to no avail. SO emptied tank and removed AGAIN and got new wiring for the pump. Replaced and works , the wiring looked OK

  6. #6
    Baby Twin
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    spoke to chris at aprillia performance and he said to check the plugs as they get enriched on starting.
    sure nuff , black as the ace of spades! got a new set coming today so i'm hoping that will be the issue now.

  7. #7
    Baby Twin
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    ok then soo i put new plugs in and ..... nada, square root of jack!! I could'nt hear the fuel pump whirr, how do you test it out of the tank? also the braided hose has a rather nasty kink in it, would that be affecting it?

  8. #8
    One Litre Duc Eater hs2300's Avatar
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    Check the pipes in side the tank between the pump and filter these split which cause no fuel pressure, also If I remember correct the pump primes with ign on and then only runs once the engine is cranking over so you may not hear it.
    If the pipe is kinked this wont help at all, sort out the kinked pipe. I remember Chris13 having the same issues and I think he swapped the pipe round so the kinked end was re positioned at the throttle bodies.
    I am sure Chris13 will read this and correct me if I'm wrong.

  9. #9
    Baby Twin
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    nice one m8, will switch the pipe out this week and check the tank pipes

  10. #10
    One Litre Duc Eater chris13's Avatar
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    Yes I switched it around to ease the kink, but I also had a split in the pipe inside the tank.
    Fuel will get to the injectors but with no pressure to actually inject the fuel.

  11. #11
    Baby Twin
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    cheers chris, i have switched it round but to no avail, i will check the pipes inside the tank
    thanks for your help

  12. #12
    Baby Twin
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    ok then, ive checked the pipes on the filter, all appears to be ok, could'nt see or feel any splits, checked the plugs, just to make sure they were sparking and they were, they were also bone dry so i'm starting to think it might be the kink in the fuel pipe causing the problem.
    sorry to keep resurecting this thread but i can't seem to fathom the problem, might have to bite the bullet and go give it to a grown up!!

  13. #13
    GP Champ
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    Kinks in pipes, tubes blocked ..........
    Unless the fuel pump primes it isn`t going to work .................................................. electricity.

  14. #14
    One Litre Duc Eater hs2300's Avatar
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    Steel prunes this may help.

    https://www.fowlersparts.co.uk/parts...000-/fuel-pump
    Sounds like the fuel pump has expired or its not powered up. Has the fuse blown ?

  15. #15
    One Litre Duc Eater hs2300's Avatar
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    Pm me your email and I can send you the workshop manual for your bike.

  16. #16
    Baby Twin
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    Quote Originally Posted by hs2300 View Post
    Pm me your email and I can send you the workshop manual for your bike.
    hi m8, thanks for the offer of the manual but i've got it sorted now, gave it to a grown up and he fixed the problem after relieving me of £70!
    thanks again to everyone who replied to this thread
    cheers
    steelprunes

  17. #17
    One Litre Duc Eater hs2300's Avatar
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    I guess by the fact you haven't disclosed what the issue was it must have been user error?

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