My blade ruins fuel pumps.

Discussion in 'Maintenance' started by Paddyk, Jul 31, 2020.

  1. Paddyk

    Paddyk New Member

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    I am on my fourth pump. I fit one and it works, the next day it is not working ,I buy another pump and it works ,the next day this is broken .
    Each time the bike gives a 2 to3 second voltage when the ignition is turned on but each day it costs me another pump
    Any ideas ?
     
  2. R.M

    R.M Member

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    One thing for sure....it's not the pump.
    Sorry, can't help with your issue, but sure someone will offer advice.
     
  3. Jez

    Jez Active Member

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    Hi, Welcome, I would say there is a blockage somewhere, I assume you have looked into the fuel system filters. I have not had much to do with the fuel system so can only give my thoughts, Jez
     
  4. Jez

    Jez Active Member

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    Second thought, fuel systems usually have a return from the pump to the tank, This could also be blocked
     
  5. Broadie

    Broadie New Member

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    What year is it?
     
  6. Black & White

    Black & White New Member

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    Hi, and welcome to the forum!
    How do you know the pump has failed?
     
  7. Paddyk

    Paddyk New Member

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    Hi
    Thanks for the reply
    I remove the pump and connect to 12v and the pump is not spinning
     
  8. Muffking

    Muffking God Like

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    Does the bike fire up when the pump primes before going dead?
    Is the pump polarised, i.e. what happens if you reverse your external supply to the pump?
    Can you meter the original supply voltage for the pump to make sure it's not too high?
    Is there a diode on any of the faulty pumps that you can short out to bypass while testing it?

    Confirm the year and I'll see if there's a diagram to check.
     
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  9. Paddyk

    Paddyk New Member

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    Hi
    I remove the pump and apply 12v but the pump doesn't spin
     
  10. Paddyk

    Paddyk New Member

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  11. Paddyk

    Paddyk New Member

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  12. Paddyk

    Paddyk New Member

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    Hi
    The engine fires up and runs ok before the pump dies
    When the ignition is turned on the voltage going to the pump is13.6v for 2 to 3 seconds.
    Thanks.
     
  13. Muffking

    Muffking God Like

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    Well the pump isn't being blown up by a faulty rectifier then and polarity should be ok if the pump is pushing fuel into the fuel rail. Could still be be a fault on the pumps though. Are they genuine pumps and can you upload a picture of the electrics end.
     
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  14. Black & White

    Black & White New Member

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    I agree with @Muffking regards suspecting faulty pumps. It's obviously normal to get priming voltage when the ignition is switched on & you should then get battery voltage when cranking. 13.6V is nowhere near enough to damage a fuel pump. Are they cheap pumps you're getting supplied with? As suggested earlier, is the fuel return from the rail to the tank clear/not kinked? That could cause excessive current flow through the motor if it were blocked, but the fuse should blow before damage is caused!?!
     
  15. Jez

    Jez Active Member

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    I would put in a lower rated fuse whilst fault finding as cheaper than pumps
     
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  16. Jez

    Jez Active Member

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    I would also have the pumps electrically/mechanically checked to see exactly why they no longer work, this may give you a clue
     
  17. Phil_M

    Phil_M Active Member

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    A centrifugal pump working against a closed head would actually draw lower amps.A closed head condition would cause pump problems (recirculation within the pump, eventually causing overheating, cavitation etc), but they would take time to manifest themselves. I'm also in the suspecting faulty replacement pumps camp....though that wouldn't explain why the original failed in the first instance :confused:
     
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  18. Black & White

    Black & White New Member

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    I thought these were roller cell or vane type pumps which are positive displacement? It's difficult to get 3 bar of fuel pressure with a centrifugal pump like a turbocharger or water pump. I had an electric window mechanism where the regulator was starting to seize & the current draw kept blowing the fuse. @Paddyk hasn't mentioned the year yet, but maybe the original failed from TMB (Too many birthdays!)
     
  19. Phil_M

    Phil_M Active Member

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    Fair enough, tbh I wasn't sure on the pump type......maybe I am suffering from TMB too :D

    Still think the pump amps would drop though
     
    #19 Phil_M, Aug 3, 2020
    Last edited: Aug 3, 2020
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  20. Broadie

    Broadie New Member

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    Personally I'd check out the fuel filter and fuel pressure regulator. Also look for signs of water in the fuel ( filler cap overflow blocked)
     

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