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Fuel Pump

Discussion in 'FZR250.com - Archives' started by TiMBuS, Oct 13, 2005.

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  1. outer

    outer New Member

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    Try getting some 'head' to release the pressure.
     
    outer, Oct 17, 2005
    #21
  2. TiMBuS

    TiMBuS New Member

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    hahaha. Lame sexually orientated joke.
    Except more head increases pressure, in the case of gravitational pressure.

    Drat. Thats like... 9.6watts! The light globes take more than that!

    Might get an ammeter on the case. And by that I mean someone elses ammeter.

    TBone you got a multimeter?
     
    TiMBuS, Oct 17, 2005
    #22
  3. Ciaran

    Ciaran New Member

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    Ciaran, Oct 17, 2005
    #23
  4. TiMBuS

    TiMBuS New Member

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    Yes indeed. Got the bike running today, cos the resin in my tank has been set (gave it a good week to do that) and it started pretty well. Minus the initial lack of flow (havent figured out the fuel tap yet... 3 prongs.. which one is the 'out' prong?)

    Oil light is back on. Seems that it just won't go off after I start the bike. Goddamn friggin light. Gives me the jibblies to see it on. I'm 80% sure it's electrical.

    Anyways I think the pump is working. maybe. I can't tell because it stops trying to pump after a few seconds when there's no flow, and when the bikes running theres no way I can hear it pumping, or even feel it pumping with the viabration and all. but there's knocking when I switch it on, so I guess thats something.
     
    TiMBuS, Oct 17, 2005
    #24
  5. Ciaran

    Ciaran New Member

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    The out prong is the one at the bottom pointing towards the back of the bike. The other two you will have to figure out yourself, try taking the tap off and pour water in to see what side 'prong' is open when switched to reserve and main, then just connect the dots.
     
    Ciaran, Oct 17, 2005
    #25
  6. koma

    koma New Member

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    If it's knocking then that's it trying to prime. If you switch the bike on and it knocks the first time, switch it off and on again and see if it still does it. It should definitely stop knocking after you switch the bike on & off twice.

    The three prongs.. i'm assuming you mean on the fuel tap.
    Top one is for the reserve pipe (if you can figure out which one that is on the fuel tank. <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->
    Middle one is the output which is meant to go to the fuel pump.
    Bottom one is for the main tank pipe.

    Hope that helps.
     
    koma, Oct 18, 2005
    #26
  7. Ciaran

    Ciaran New Member

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    Ok I think I may just have to check out my bike again and get back to you on this.
     
    Ciaran, Oct 18, 2005
    #27
  8. Ciaran

    Ciaran New Member

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    The bottom one on mine goes to the fuel filter / pump. The other two above run to the tank next to each other. I have had the tap in the off position with the bottom line disconnected and no fuel had leaked from the tap. Is your tap a stock one?
     
    Ciaran, Oct 18, 2005
    #28
  9. TiMBuS

    TiMBuS New Member

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    The bottom one on mine, I believe is the 'out'

    That top one of mine seems to be the main, and the side tap, through deduction, is the reserve. I gather.
    After the thorough tank cleanout, I have become very well aware of which tank tap hole is which. :p

    Oh, and about the knocking noise. That happens every start. If you mean the pump is trying to prime due to lack of fuel in it, then no, it knocks even with fuel flowing in it (told ya its cheap). But it knocks alot louder when fuel-less. I noticed the bike only powers the pump when it needs flow. ie when revving, or when starting. Quite smart electrics there, Yamaha.
     
    TiMBuS, Oct 18, 2005
    #29
  10. koma

    koma New Member

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    Hmm... i may just have to eat my own hat. <!-- s:oops: --><img src="{SMILIES_PATH}/icon_redface.gif" alt=":oops:" title="Embarassed" /><!-- s:oops: -->
    I'll give it another look next time i pop the tank.
     
    koma, Oct 18, 2005
    #30
  11. Ciaran

    Ciaran New Member

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    Lol, it only seems like a couple of threads ago I was doing the same. I found it goes down allot easier with a nice cold beer. <!-- s:rofl: --><img src="{SMILIES_PATH}/icon_razz.gif" alt=":rofl:" title="Rofl" /><!-- s:rofl: -->
     
    Ciaran, Oct 18, 2005
    #31
  12. TiMBuS

    TiMBuS New Member

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    I found that hats compliment the beer, really. The hat is more a side dish, while the beer is the main focus.

    Oh, and I might add that when I put fuel in her for the first time, it took about 5 litres to just push the fuel down to the filter, and more to push it past the pump. So.. very, very little pressure with 5 or less litres, guys.
     
    TiMBuS, Oct 18, 2005
    #32
  13. TBone

    TBone New Member

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    WHY I cant post to this topic!?!?!
     
    TBone, Oct 19, 2005
    #33
  14. TiMBuS

    TiMBuS New Member

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    But you did.

    THATS irony...

    Oh btw TBone. You were right. The small plug was the pump plug (although I ripped the old plug off and now it's a pretty big plug)
     
    TiMBuS, Oct 19, 2005
    #34
  15. TBone

    TBone New Member

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    lets try this again...

    well for all that want I have some info... on most bikes with 4 carburators that I have come across the minimum fuel flow rate out of the fuel pump has to be 1200c c per minute... the CBR250R fuel pump when new is 1800c c per minute...

    From my understanding with this info and the diameter of the fuel pumps outlet you should be able to calculate the requirled preasure...


    this is what I get...

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    Please contact the server administrator, inform them of the time the error occurred, and anything you might have done that may have caused the error.

    More information about this error may be available in the server error log.
    Server at <!-- m --><a class="postlink" href="http://www.fzr250.com">http://www.fzr250.com</a><!-- m --> Port 80
     
    TBone, Oct 19, 2005
    #35
  16. TBone

    TBone New Member

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    and I just worked it out... it is the c c bit... lol
     
    TBone, Oct 19, 2005
    #36
  17. TiMBuS

    TiMBuS New Member

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    You can't type cc?

    like: 1800cc

    just a test there.

    Well I cranked the bike today after fixing the fuel tap. It had rust in it from the tank and was keeping the rubber seal slightly open. No no drips =D. Oil light is STILL on, and I even ran the motor 5 mins, put the oil to the exact level in the glass (like 50 ml more), and let it run for another minute. Damn light. My uncle says there might be a blockage in the oil flow path, and maybe the oil is only riding back on the cam chain, and hence it's not coming back down fast enough to keep the light off. Not sure.
     
    TiMBuS, Oct 19, 2005
    #37
  18. Spook

    Spook New Member

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    just gonna drop into your little science class here for a moment (actually its pretty interesting stuff - I never managed to apply my education to real life problems before <!-- s:alcoholic: --><img src="{SMILIES_PATH}/icon_all_coholic.gif" alt=":alcoholic:" title="Alcoholic" /><!-- s:alcoholic: --> ), because I CAN'T TYPE "cc" EITHER. Whats up there??
     
    Spook, Oct 19, 2005
    #38
  19. Ciaran

    Ciaran New Member

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    Ok, from memory we are still missing the power rating of the pump.

    Pressure (Pa) = Power (W) * Flow rate (m^3/s)
    x = y * 3.0000e-5

    So we still need a power rating for a standard 1800cc/min pump. I don’t think you can get a pressure from just a flow rate and area without some sort of force behind it. I have been known to be wrong in the past though, dave that’s your queue.
    Take a seat and crack open a beer. I learnt bugger all from my schooling, mainly because it was all to removed from real life problems. But really what does that have to do with fuel pumps?
     
    Ciaran, Oct 19, 2005
    #39
  20. dave

    dave Well-Known Member

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    I'm only guessing on this but pressure = power/flow.

    More flow = less pressure with a given power. What units one would use I don't know, and also being a mechanical device what efficiency would you factor in?

    From my limited experience with solenoid pumps, the solenoid pulses the piston back against a spring, drawing fluid in, and then releases. The spring forces the piston and therefore the fluid thru the outlet at a presure governed by the spring rate. The current drawn by the solenoid would depend on how much was pumped out between pulses, or, how long it takes the piston to get to the retrigger point.
     
    dave, Oct 19, 2005
    #40
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