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Posted by chriscase on Tuesday, August 05, 2008 at 23:52:00 :
In Reply to: Re: Red hot on hills is normal. posted by Glen Culdesac Idaho on Tuesday, August 05, 2008 at 18:17:01 :
So the pump is then pumping gas vapors instead of liquid. And/or, the fuel is boiling in the line between the pump and carb. Same difference. Gaseous fuel is only 1 /10,000 of liquid fuel, so it would take a lot of pump strokes to keep a car running.
An electric pump in the rear keeps the fuel under pressure, preventing boiling the same way a radiator cap does.
One fella on the net doesn't believe it exists. He claims it in non-flat fuel pump suraces allowing air in right at the pump. I doubt his theory, rubber gaskets have plenty of squish.
There's some owners and some trucks that seem to have problems forever, while others never miss a lick. So I'm thinking the root is something mechanical. I had one truck that somebody threw a handful of leaves into the tank. Ran fine until a leaf would get sucked against the pick-up. Ran fine later, after using the other tank and letting the leave get un-sucked.
My current FFPW, on modern gas, gets bubbles in the bowl too. But runs fine. I'm thinking that when hot, the cap holds some vapor pressure, preventing vapor locking. It's a later model cap, vapor/suction supposedly. Next time I get it hot, I'll have to see if it holds enough pressure to whoosh when loosened.
Go ahead, ask me what time it is, I'll tell you how to build a clock...
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