gas cut off

1945 2n front mount cant get glass bowl to quit leaking tried new bowl same thing don't use it that often been sitting for a while thought I would crank today cranked and ran like a champ any thoughts maybe the black gasket bowl fits onto ? thanks--vince
 

this is a common problem, i had to tighten my new one several times before it stopped leaking.

if u look at the surface of the metal that rubber gasket seats against, u may or may not see a slight recess for the screen to sit in and not interfere with the gasket. if yours doesn't have that, u could take a pair of scissors and trim the screen.
 
Turn the knob off fully, remove the bowl & carefully check the groove in the top of the assembly for dirt/crud/old gasket material. Most leaks on a new gasket are caused by having it seated incorrectly, a incorrectly seated screen, a screen slightly too big for the rim, or because some of the old gasket was left in the groove. Or, some misguided soul may have gunked it all up w/ gasket pucky. Don?t forget to check the bowl rim for chips; if it?s chipped, you will never get it to stop leaking. Clean or replace the screen. You can get both the cork gasket & the screen from TSC; p/n 0237144. A cork gasket will work if you soak it first in gas, but I like rubber. Check out tip # 10 at the link below for the correct NAPA part number. However, the newer ones aren't as thick as the old ones and the price is now $4 each. I?ve got the new ones to work, but it takes a few tries. And, at $4 for a thinner gasket, I?m not planning on using the NAPA gaskets anymore.

Put the bowl back on & hand tighten the thumb screw. Turn the gas on & look at the bowl. If it starts to fill the bowl, turn the gas off & start over; it has a leak. You will know it's sealed when gas does not flow into the bowl w/ the engine off. It won't fill with the bowl securely on because the float has closed the needle valve in the carb and there is nowhere for the air in the bowl to escape. (assuming the carb bowl is full) When the engine is started the needle valve will open and the trapped air will escape through the carb vent. If you loosen the bowl, it will fill.....and leak.
Do not open the valve more than 2 or 3 turns. All the way open gets you the 1 gallon reserve & that port is usually clogged.
75 Tips
 
If someone has tightened the nut with pliers. Good chance the top is warped. Sometimes two gaskets will help. Otherwise you need a new strainer.
 
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