Baffled by fuel feed, anybody been there before?

Discussion in '3rd & 4th Generation 1990-1997' started by coffee_brake, Mar 16, 2021.

  1. coffee_brake

    coffee_brake New Member

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    thank you, I'd rather fix the old Honda pump than rely on new.
     
  2. coffee_brake

    coffee_brake New Member

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    When I jump the relay, what stops the fuel pump from overflowing the carbs?

    Sent from my LM-K500 using Tapatalk
     
  3. squirrelman

    squirrelman Member

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    the pump stops pumping when internal backpressure rises to the set value of 6 psi, controlled by internal springs.
     
  4. coffee_brake

    coffee_brake New Member

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    Perfect, thank you!!! I messed with all the moving parts, cleaned the contacts, got no more than a burble from the old pump. New one on the way.
     
  5. squirrelman

    squirrelman Member

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    another pump test: use ohmmeter to check for the resistance between it's two leads. a good pump will show some resistance (continuity), and a failed pump will show zero continuity.
     
  6. Diving Pete

    Diving Pete Member

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    You only need a piece of wire 3 or 4 inches long. Bare both ends and bend it in a horseshoe pattern. All you are doing is bridging the relay connection. The pump will make noise for a few seconds - tic,tic,tic,tic,tic,tic,tic,tic,tic then slow to tic, Tic, Tic, Tic. At that point you are all done and can remove the wire, reinsert the relay, and start the bike. It shouldn’t take more that 5-10 seconds.
     
  7. coffee_brake

    coffee_brake New Member

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    MANY THANKS all, I got a new pump in today but it never stops pumping. The wire harness is intact so the relay should still be there, but this new pump (for 3-6 psi, it's for automotive carbs), just didn't stop ticking the whole time it was wired in while the bike was running. Isn't it gonna flood it?
     
  8. coffee_brake

    coffee_brake New Member

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  9. squirrelman

    squirrelman Member

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    seems like a bypass wire is on the pump relay already ?? good luck with your cheapshit chinese garbage pump, and be ready when it fails soon.
     
  10. coffee_brake

    coffee_brake New Member

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    Easy there killer! I thought this was a good fuel pump. And the plan is to stow a second pump on board just in case. I'm happy to spend money on good parts, but if the stocker failed, what's a better option?
    Not everybody is trying to cheap out and ignore good advice. I simply didn't get a strong recommendation for the fuel pump. Please don't be nasty if the OP is navigating without a North Star....
     
  11. squirrelman

    squirrelman Member

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    please report here how long the pump lasts. :confused:
     
  12. coffee_brake

    coffee_brake New Member

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    If you or my searches haven't pointed to a good reliable pump, please refrain from digging on me about my best guess for a quality unit. WTF was I supposed to do, just go buy the most expensive unit without knowing anything about what folks are finding is a good quality one? Dang dude...I just wanna know how the relay works with any given fuel pump so I can do a better job.
    I'm not ignorant because I'm lazy or cheap. I'm ignorant because I don't know, and I'm trying to know better. That's why I'm asking here for help.
     
  13. Captain 80s

    Captain 80s Member

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    Stick with Tour Max or K&L for a quality replacement pump. They are made in Japan and have the Mitsubishi symbol on them just like the original.

    Not cheap, but probably the last one you will ever need to buy.

    K&L 18-5529

    Tour Max 8113101

    Or look at the application guides and see what other bikes take the same unit (quite a few) and find the cleanest, newest, lowest mile OEM used example off ebay to save some dough. I have been preemptively replacing my now 35 year old pumps with this method and it has been great. Sellers often have return policies on these, and I have only had one dud. They instantly refunded and didn't even want the bad unit shipped back. And you usually get some great formed fuel lines and clamps for other projects.
     
  14. squirrelman

    squirrelman Member

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    it's ALL in the honda factory service manual.

    maybe you got a great deal as your $10 pump seems to have a 2 year guarantee ?
     
  15. Diving Pete

    Diving Pete Member

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    Don't worry, Basically every year we see threads like this where someone replaces the old Honda pump with a POS from China. Sadly, the lifespan and reliability of these pumps are at best questionable & so draw a fair amount of distain from the crowd here. You have to remember that these bikes RARELY fail so replacing with a component that is a 'ticking time bomb' before it dies maybe isn't the best idea.. PLEASE DO NOT buy another.....(as a spare) ! If it was me I'd buy a 2nd hand OEM pump first, 2nd and 3rd before even thinking of elsewhere.
     
  16. squirrelman

    squirrelman Member

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    no, no, no ! if coffee break has good results with his $10 pump he will have pioneered a cost-effective replacement for the benefit of us all. :cool:
     
  17. coffee_brake

    coffee_brake New Member

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    Thanks for the heads up on what should be a better quality pump, I honestly didn't know what to look for. I got the cheapie with the intent to make it a spare to keep under the seat after getting a Honda unit, had no intention of trusting it considering how poorly about any of the Chinese stuff holds up to fuel.
    If y'all think a used unit won't be wasted money then I'll source one of those as my backup and still get that new unit.



    Sent from my LM-K500 using Tapatalk
     
  18. coffee_brake

    coffee_brake New Member

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    Coffee_brake is a she. And you are a jerk.

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  19. squirrelman

    squirrelman Member

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    i don't care which sex someone is, and " jerk" is a very mild and all too polite term for what i am, sis. :Flypig:
     
    Last edited: Apr 13, 2021
  20. Diving Pete

    Diving Pete Member

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    Don’t worry about it that’s why you are on this forum.. the Honda ones pretty much work until they don’t. I’d trust a used Honda item over a new Chinese one every time.
     
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