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Primer bulb drawing air


Phil H
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  • 3 years later...

....an old thread but still relevant.

I have the same problem but I think the problem is the the main-jet check valve not closing  allowing air back into the fuel circuit when applying suction from the purge bulb.

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Yes, or very little fuel in bulb.

 

The way to see if the main-jet check valve is working is (https://arbtalk.co.uk/forums/topic/133943-walbro-carb-problem/page/3/#comments

 

H screw out, pipe over H jet opening, thumb over the fuel feed to the main jet, now blow/suck, you should feel the check valve open and close, no close and it’s not working.

 

Edited by RobMort
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Another way to check fuel supply and main jet check valve is to use a medical type syringe. First try and fill from the carburretor intake hose, if hard to draw then check tank air inlet and fuel pipe, should be no bubbles, unless there is a split in pipe. Then draw from pipe connecting carb to primer, if check valve faulty lots of small bubbles in fuel. After use pull syringe apart, spray silicone on rubber seal, store in 2 parts or it will stick fast!

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