Greg--- I would think that taking out the float valve on the front carb
and cleaning it good might solve the sticking problem. The isopropyl
would only help if the sticking were caused by some type of varnish that
the detergents in the fuel couldn't clean during the running of the
engine.
It's not too unusual for a fuel filter to be seen as half full or having
air in it, when the fuel level in the tank is below this level. When the
pump is operating, this air should get pushed along with the fuel and
expelled in the float bowl thru its vent. I have found that angling
these filters (and electric pumps) greatly reduces this air pocket from
forming).
If your float were occasionally staying open, rather than closed, I
would blame it on the three lb. of pressure you're getting. (Most
mechanical pumps only get about half that much)
While I'm not much of a believer in fuel tank additives, this might be a
good case for trying one of them. (If you don't want to remove the carb
bottom to clean the float valve).
Dick
From: rgperry@earthlink.net(Greg Perry) Hello,
My fuel filter before the carbs starts to fill with air when the gas
tank is about 1/2 full. The fuel pump pressure is 3 psi and holds for a
while then slowly drops off. The metal and rubber fuel lines have all
been replaced and gas tank has been coated inside and out. There are no
discernable leaks. The front carb float valve sticks shut overnight so
that the front carb runs dry and the engine runs on the three rear
cylinders. (great gas mileage with reduced power) I have to pull the
float bowl plug and tap the carb with a screwdriver handle, disconnect
the negative distributor wire from the coil and crank the engine a few
times until the fuel flows out of the carb bowl unsticking the float
valve. Then it runs on all six cylinders. Is it possible that the air is
entering the front fuel filter due to leaking float valves? Can one
rejuvenate the old float valve by using 99 % pure isopropyl alcohol? I
know wishful thinking, but it is my daily driver!
Thanks,
Greg Perry
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