Re: Fuel shut off valve.

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Posted by Tim Daley(MI) on June 27, 2018 at 04:49:13 [URL] [DELETE] :

In Reply to: Fuel shut off valve. posted by Bryan Waterworth on June 26, 2018 at 10:26:57:

Okay I have to ask because sometimes it is the plain obvious things that are overlooked. How much gas is in the tank? To install a sediment bulb the tank has to be empty first so did you fill it up or only put in a gallon or so? The Sediment Bulb is designed so 2 Turns Open accesses the Main Fuel flow port. When valve is fully open, it allows the 1 gallon reserve port to let fuel to flow. A low tank would one reason why you don't get any flow unless all the way open. Next, Don't assume a new part, especially today, out of the box is all set and ready to go. Check it out before installation. It is possible your A) new unit is plugged, or B) your fuel tank has a lot of rust, dirt, flakes, that have worked into the main inlet port and plugged it up. Where does the leak come from? Often it is the valve stem due to a worn seal. Is this what you mean by 'old seal'? If you mean the horizontal gasket between the glass bowl and the unit, is the new one rubber or cork? Use cork and soak it first in fresh gas. Be sure the fuel line is the correct size with correct fittings. Brake and fuel lines use as special thread size -7/16-24 UNS and often get boogered up installing due to cross threading. Always start a fastener by hand to get the 'feel' that its correctly started. The sediment bulb is a soft metal -pewter or zinc in the old days, aluminum today so it doesn't take but one bad attempt to muck up the threads. Poor fuel flow on a new bowl is often caused by a vacuum too. Upon assembly, open valve slightly and loosen the bowl clamp slightly to release any vacuum lock. These are the major things to check for a leaking/non/functioning fuel bulb.


Tim Daley(MI)


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