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Thread: $#*@^ carburetor flooding

  1. #1
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    $#*@^ carburetor flooding

    Desperately need some help on this one.
    1985 accord with rebuilt keihin carb. Original carb was loading up with gas so bought a rebuilt one. Rebuilt one ran fine for about 15 minutes then started loading up with gas like the first one. Fuel pressure at the carb is just under 2psi, which the rebuilder says is ok. I'm completely out of ideas. This is my grandson's car and I can't afford to take it to a shop. Does anyone have any ideas?
    Thanks
    Grandpa



  2. #2

    Ichiban's Avatar
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    Re: $#*@^ carburetor flooding

    Perhaps the rebuilt one is DOA? The float should close when the bowl is full, since it's not, I'd say the rebuilders screwed up. See if you can exchange it.
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    Re: $#*@^ carburetor flooding

    Thanks for answering. Yes, I can exchange the carb, but just want to be sure that nothing else can cause this particular problem before I do that.
    Thanks

  4. #4

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    Re: $#*@^ carburetor flooding

    There might be little windows on the side of the carb where you can see the fuel level. If so, then it should be dead on the little marks in the window. If it isn't, try adjusting. If that doesn't affect the fuel level, you have a float or needle valve problem.

    Good luck with that. Those Keihins can be very difficult.
    Dr_Snooz

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  5. #5
    3Geez Veteran lostforawhile's Avatar
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    Re: $#*@^ carburetor flooding

    Quote Originally Posted by Dr_Snooz View Post
    There might be little windows on the side of the carb where you can see the fuel level. If so, then it should be dead on the little marks in the window. If it isn't, try adjusting. If that doesn't affect the fuel level, you have a float or needle valve problem.

    Good luck with that. Those Keihins can be very difficult.
    with fuel on the fuel should cut off before it floods when the needle valve closes,you may have to adjust float level, I think it's so a quarter turn per minute or something so the level can stabilize, was the carb shipped to you ? if it got flipped over the needle valve and float could be stuck up and jammed up.

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    Re: $#*@^ carburetor flooding

    Thanks folks, this carb does have site windows on side with dots. The idle fuel level is perfect and the primary was perfect when we first installed the carb. It was only after running for about 15-20 mins that it flooded and died. After the car sits for an hour or so the gas seems to drain out of the carb and the primary level is good. But within 1 minute after we start engine it floods out again. Yes, the carb was shipped.
    I can return the carb but I just want to be sure that nothing else could cause this problem, before I do.
    Thanks

  7. #7
    3Geez Veteran lostforawhile's Avatar
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    Re: $#*@^ carburetor flooding

    Quote Originally Posted by confused View Post
    Thanks folks, this carb does have site windows on side with dots. The idle fuel level is perfect and the primary was perfect when we first installed the carb. It was only after running for about 15-20 mins that it flooded and died. After the car sits for an hour or so the gas seems to drain out of the carb and the primary level is good. But within 1 minute after we start engine it floods out again. Yes, the carb was shipped.
    I can return the carb but I just want to be sure that nothing else could cause this problem, before I do.
    Thanks
    are you sure the fuel pressure is right? it really sounds like something is wrong with the needle valve or the pump starts making too much pressure.

  8. #8

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    Re: $#*@^ carburetor flooding

    Quote Originally Posted by lostforawhile View Post
    are you sure the fuel pressure is right? it really sounds like something is wrong with the needle valve or the pump starts making too much pressure.
    The factory pumps on these cars generally can't make "too much pressure". The output pressure is determined by a spring which forces fuel out of the pump. Since spring rate is determined during manufacture, logically it will only remain the same, or degrade with fatigue. The solenoid's function in the fuel pump is simply to reload the fuel chamber and spring pressure once the spring has reached full extension, the pumping chamber is fully collapsed, and all the fuel has been pushed out.

    I am assuming the fuel pump is of factory design?
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    3Geez Veteran lostforawhile's Avatar
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    Re: $#*@^ carburetor flooding

    Quote Originally Posted by guyhatesmycar View Post
    The factory pumps on these cars generally can't make "too much pressure". The output pressure is determined by a spring which forces fuel out of the pump. Since spring rate is determined during manufacture, logically it will only remain the same, or degrade with fatigue. The solenoid's function in the fuel pump is simply to reload the fuel chamber and spring pressure once the spring has reached full extension, the pumping chamber is fully collapsed, and all the fuel has been pushed out.

    I am assuming the fuel pump is of factory design?
    there were a few that had built in regulation, not sure exactly whats on that car

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    Re: $#*@^ carburetor flooding

    Fuel pressure is 1.8 psi according to a new tester, assuming the new tester is correct. I tested it 3 different times and each time it was somewhere between 1.7 and 1.9. The carb rebuilder says that anywhere between .5 and 3.5 psi is ok, above 3.5 the pressure will keep the needle from shutting off gas flow.
    Because I had the same problem before installing the rebuilt carb, I just want to be sure that the problem has to be in the carb.
    Thanks to everyone for your help. I'll contact the rebuilder tommorrow.

  11. #11
    3Geez Veteran lostforawhile's Avatar
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    Re: $#*@^ carburetor flooding

    Quote Originally Posted by confused View Post
    Fuel pressure is 1.8 psi according to a new tester, assuming the new tester is correct. I tested it 3 different times and each time it was somewhere between 1.7 and 1.9. The carb rebuilder says that anywhere between .5 and 3.5 psi is ok, above 3.5 the pressure will keep the needle from shutting off gas flow.
    Because I had the same problem before installing the rebuilt carb, I just want to be sure that the problem has to be in the carb.
    Thanks to everyone for your help. I'll contact the rebuilder tommorrow.
    does your car have a charcol canister? and sealed fuel system? if it has the two way valve on top of the tank, it's possible vapor pressure is backing up into the carb, thats the same pressure that causes that hiss when you open the gas cap. if it has a canister, try t-ing off of the line coming from the canister, not the vaccume line, but the big line that goes directly to the carb. see if after a few minutes it starts building up pressure. if the carb vent valve isn't opening right it could be causing the canister to increase the pressure on the float bowl, when the carb is running it requires atmospheric pressure to function right, a malfunctioning valve could cause the canister to pressure the carb.
    Last edited by lostforawhile; 08-03-2009 at 05:18 PM.

  12. #12

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    Re: $#*@^ carburetor flooding

    Quote Originally Posted by lostforawhile View Post
    if the carb vent valve isn't opening right it could be causing the canister to increase the pressure on the float bowl, when the carb is running it requires atmospheric pressure to function right, a malfunctioning valve could cause the canister to pressure the carb.
    How? The float bowl is directly vented to the top of the throttle body. Any pressure is simply going to go up the line, over the fuel in the float bowl, and up the throttle body into the air filter housing. There is no way for the float bowl to contain pressure.
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    Re: $#*@^ carburetor flooding

    other things to check: water in fuel, secondary butterfly not closing, carbon cake on preheater spacer if it has one, warped air horn or top hat (some overzealous tightening of the air cleaner housing) debris in fuel like filter material disolving from additives, rust from ethanol corroding the tank neck and hardware.

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