Fuel Pump, another potential fix

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by men8ifr, Jan 7, 2011.

  1. crazybrit

    crazybrit Long timer

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    So I ordered one of these from the guy from lc8.nl. Also he e-mailed me an english version of the install PDF which is pretty good. Not cheap thanks to the exchange rate, $63 w/ shipping. We shall see. Maybe it'll be fuel pump Nirvana :D
    #21
  2. gefr

    gefr Life is a trip

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    I guess the lag can be inserted with some electronic trick, so looks like a neat job. Cheers.
    #22
  3. kirb

    kirb should be out riding

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    Not sure why the diode doesn't work. On DC systems, diodes are used all the time across coils to reduce the 'flyback' voltage of a discharging coil. This saves relay contacts and electronic components during breaking cycles.

    This diode should be placed across the coil, not contacts (not sure it matters too much here). The banded side of the diode should face battery positive side and the non-banded diode should face the negative side. I would use 1000V, 10A diodes minimum.
    #23
  4. Scott Baja

    Scott Baja el semental rojo

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    Hey ridewestKTM

    Would you be so kind as to direct me to, or explain the limp home/home repair of the pump? :ear
    #24
  5. men8ifr

    men8ifr Been here awhile

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    Yes I reasised the capacitor has a bit of a rough connection later in the video - I don't think it does at the start? Eitherway watching it when not filming (easier) the sparking is largest when the capacitor is fully disconnacted, if there are little sparks (as in at least some) of the video the sparking across the contacts is reduced a bit so actually works a little bit better than later in the video.

    RE the diode - I tried it both ways but did nothing - some-one mentioned there is already a diode present. It seems clear with the car points a capacitor is needed otherwise the life is very short, the pump seems the same.

    I fitted the capacitor to the pump and also tested it, there is a lot less sparking with a new pump compared to the old worn contacts and again the capacitor appeared to reduce the visible spark intensity by about 5x - so I'm hoping the bike will be good for minimum 10,000 miles (standard pump) x 5 = 50,000 miles or 44,000miles x 5 = 220,000 miles (44k is the mileage of my bike with original pump). We'll see!
    #25
  6. ridewestKTM

    ridewestKTM Long timer

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    There were several ways discussed. Some were electronic mods to stock or electrical mods, others were not using the pump. I think it was gonow that used is turn blinker to pulse the pump. In that case it was directly grounding the point coil wire with the brown black grounded and hooking the black/blue to a blinker. Very creative! My bonehead way (I tested) was connect a hand tire pump to the vent (both tied together) and pump pressure into the tank. How far you go between pumps depnds on how tight the vent seals in the caps are and how full the tank is - more empty will go futher. I set it up to pump while riding -might look funny if you have the pump in the wrong spot tho.:huh Someone else noted that if you bypass the pump and have a full tank you'll go 40mi then if you lay it over and transfer to left tank and close right valve you can go further. I noted also using these schemes and plug the vent, the Adventures get the tank hot enough that you might get all the way out on vapor pressure.
    Not sure I covered the question - I just plan to use the tire pump w/wo bypassing the fuel pump.
    #26
  7. ridewestKTM

    ridewestKTM Long timer

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    Agree the diode is across the coil with band towards the Black/blue (pos) wire. One would think it was enough but for some reason it isn't.
    As said before I have replaced this diode by cutting the steel shell in just the right place then put a new diode on the outside of the steel.
    #27
  8. mousitsas

    mousitsas Long timer

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    :rofl
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  9. Trailie

    Trailie Can still fog a mirror

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    Has anyone tried a low pressure American fuel pump available at the autoparts store for about $40?
    #29
  10. cpmodem

    cpmodem Orange Caveman

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    What one do you have in mind?
    #30
  11. ridewestKTM

    ridewestKTM Long timer

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    Yes many tries. Note there are really only a few manufactures and others stamp their names on them.
    Don't try purolator 04 which is = to facet 60XX -just doesn't work
    Avoid ones that flow thru when off. Like most facets (see below),Airtex..
    Avoid excessive pressure > 4psi
    Few are too slow, all seem to be ok for current.
    Facet 40171 seems ok and mounts upside down ok even when it says not to. Then there are the vacuum ones for 2stroke snowmobiles.
    #31
  12. ktm

    ktm Been here awhile

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    I am about to leave in 10 days for 3000 kms trip and I recently had sporadic failures during accelerations, which makes me think the fuel pump is about to leave me.
    The dealer wants 450 euro for replacing it and on my opinion it just doesn't make sense since the one I have has less than 10k kms (= waste of money).
    I tried to get in contact with Mr. Bean as I am currently in Amsterdam, but I guess I need to wait to get back before the stock will be available again.

    So I need to play in advance, at least in these days to avoid a 2 days stops and a bill of over 500 euro for this bloody pump.
    The above options seem to be feasible (I think) even without having a deep knowledge.
    If I've understood I may risk to leave the pump as it is now and in the unfortunate event of failure apply this fix on my own on the road side with few basic tools and some patient, or...

    Would a spare one like described here http://www.ktm950.info/how/fuel_pump/fuel_pumps.html
    an easier fix to do on road side or just before leaving (considering my level)?

    Thanks
    #32
  13. Qwik

    Qwik Adrenaline Addict

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    Egads, I think I will just stick with my Vacuum actuated pump
    #33
  14. cpmodem

    cpmodem Orange Caveman

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    Rather than wait for your OEM pump to fail completely and leave you by the side of the road replacing it, I would just install the Facet 40171 pump now. No worries about flooded engine or too much pressure.
    :freakyEnjoy your trip.
    #34
  15. ktm

    ktm Been here awhile

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    Do you know if it also works for 990 ABS 2007?
    #35
  16. crazybrit

    crazybrit Long timer

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    990 fuel pump is in the tank. I can't see how the Facet will work. This whole thread is for 950 fuel pump fixes, which is why I expect cpmodem mentioned the facet. If you have a 990, you're kinda in the wrong place!
    #36
  17. cpmodem

    cpmodem Orange Caveman

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    Neither would the vacuum pump, or any of the solid state fixes in this thread. Are you sure the pump on your 990 is bad and not just a clogged filter?

    I guess i should question every poster as to what bike, model, year, displacement before answering.
    #37
  18. cpmodem

    cpmodem Orange Caveman

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    BTW, there are literally dozens of things that could cause the symptoms you describe with your 990. Maybe you should start a new thread and elaborate more on the problems you are having.
    #38
  19. ktm

    ktm Been here awhile

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    So the 990 fuel pump is different from the 950, sorry about that. A thread was already opened and someone kindly pointed me to the fuel pump.
    #39
  20. jonz

    jonz Miles are my mantra

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    Still interested and hoping to hear something one of these days.
    #40