should the fuel filter be full??
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Thread: should the fuel filter be full??

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    Junior Member NJTW54's Avatar
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    should the fuel filter be full??

    hey guys still got my on going problem of surging,sputtering at high rpms.... it looks to be like not enough fuel is getting to the carb... one second the fuel filter(clean cone type) is full of fuel and she will run fine then it will start to sputter and i will look at the fuel filter and it will only be about half full... shouldnt the fuel filter just be full at all times... the tank has plenty of gas. and is relatively clean. is there any way the petcock could not be fully openeing... and like i said at times it will be full other times it seems to not flow into the fuel filter....

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    Senior Member Dryden-Tdub's Avatar
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    Quote Originally Posted by NJTW54 View Post
    hey guys still got my on going problem of surging,sputtering at high rpms.... it looks to be like not enough fuel is getting to the carb... one second the fuel filter(clean cone type) is full of fuel and she will run fine then it will start to sputter and i will look at the fuel filter and it will only be about half full... shouldnt the fuel filter just be full at all times... the tank has plenty of gas. and is relatively clean. is there any way the petcock could not be fully openeing... and like i said at times it will be full other times it seems to not flow into the fuel filter....
    The screens on your petcock must be clogged or you have a kink in the hose from the petcock to the filter. I suppose your gas tank could be venting poorly but I doubt that. Cheap enough to replace that petcock and seal.


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    Banned ZDR1's Avatar
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    My 90 degree filter is 3/4 full, I would check the screen on petcock and open the gas cap when it starts to surge stock tank or Clark?
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    Senior Member jeffrolives's Avatar
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    Just checked mine. 90° cone filter.

    Maybe 3/8" fuel in bottom, and it hasn't been running.

    I am not sure what your problem is, but this question has been asked in many different forums. Fuel filters, at least in small engine applications, are seldom, if ever, "full".

    It does sound like it may be starving though. Gas tank clean?
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    Banned ZDR1's Avatar
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    Also check your air filter.
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    Senior Member jeffrolives's Avatar
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    Just kinda glanced through your previous posts.

    Welcome. Neat bikes, eh.

    Have you taken off an cleaned this "new" carburetor?

    And/or cleaned it up with any new parts?

    The advice here about the new jets did mine wonders.

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    Junior Member NJTW54's Avatar
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    Thanks for the replies.. Yes it's a stock tank... Like I said its like 1/4 full when it starts to surge, the carb sounds like it backfires a bit too, (starved for fuel?). But the some times the cone is pretty much full and it seems to ride fine... Could it be possible venting issue with the gas tank...

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    Senior Member admiral's Avatar
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    Easy things first. I'd like to emphasize what Dryden-Tdub and zdiver1 have mentioned.

    I'd remove the fuel filter and hose's and see if fuel is free flowing out the petcock. If not, drain fuel from your tank and remove your petcock and check for dirt and debris blockage.

    If the petcock is free from blockage and fuel is flowing from the tank in the non-running test, then hook the tank back up using only a hose from the petcock to carburator (bypassing the fuel filter).

    If you still have an issue, remove the fuel cap when it happens and see what happens.

    If all this checks out, start checking the carb.
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    Senior Member mrlmd's Avatar
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    Take off the tank fuel cap when it starts to sputter and see if that cures it. If the vent in the cap is plugged you may have a relative vacuum in the tank and that can stop the gravity flow of fuel to the carb. You may hear a whooshing sound as you loosen the cap from air rushing in if this is the case.
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  11. #10
    Senior Member JustPassinThru's Avatar
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    I went through this with a carbureted Ford Pinto, a 1973, when I was young and unemployed and broke and had to do my own mechanical work.

    After replacing the carburetor with a Holley aftermarket (on a 2000cc four!) the new carb did not have provision for the integral Motorcraft-style mesh filter. It was in-line.

    It bothered me that there was always air bubbled in it. I attributed drivability problems to it. And I wondered how the air, under pressure from the force of the fuel pump, would do with the float valve in the carburetor.

    Try as I might, though, I couldn't route the fuel line to get that air out. And what the carb needed was just adjustment.

    I let it go.

    If you've got sputtering, look to see about the vital systems. Fuel - as in, restriction - air and ignition.

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