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    7up's Avatar
    7up Posts: 180, Reputation: 1
    Junior Member
     
    #1

    Apr 23, 2009, 04:30 PM
    Carburetor problems
    I have a 72 gmc pickup with a 350engine and a 4brl carb,the problem is that my carb is not getting any fuel but when I remove the fuel line from the carb it's full of fuel,and when it does run as I step on the gas it just bogs out,also while engine is off as I press the throttle I can see a strong stream of fuel coming out the jets.but when running no fuel comes out of the jets at all
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
     
    #2

    Apr 23, 2009, 04:46 PM

    I don't know the vehicle, but the carb bowl is not venting.

    Could be charcoal canister system, bowl vent etc.

    If you loosen the gas cap it may improve. That isn't a permanent fix.
    7up's Avatar
    7up Posts: 180, Reputation: 1
    Junior Member
     
    #3

    Apr 23, 2009, 05:04 PM
    Quote Originally Posted by KeepItSimpleStupid View Post
    I don't know the vehicle, but the carb bowl is not venting.

    Could be charcoal canister system, bowl vent etc.

    If you loosen the gas cap it may improve. That isn't a permanent fix.
    While the engine is off fuel comes out the jets just fine but while running it won't
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
     
    #4

    Apr 24, 2009, 05:45 AM
    It sounds like you need that carb overhauled and cleaned in an ultra-sonic bath to clear the tiny passages that have likely become varnished over time.

    When you step on the gas, the accelerator pumps gives a visible squirt of fuel to provide power, but when the engine is running at idle, little fuel is needed and often cannot be seen.

    Find a shop that specializes in carburator work and have them check yours. Once finished, you should have plenty of power and performance.

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