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Ed Anderson wrote:
I believe someone, Jim S?, mentioned that if there is a vapor lock problem
it is almost certainly occurring before the EFI pumps, and I agree. Many
EFI automobiles today are using a "no-return" fuel system. But in those
systems the fuel system is pressurized to high pressure all the way from
the in-tank pump to the engine - so with 20-40 psi fuel pressure in the
lines it considerably reduces the probability of vapor forming. Although
if you heat any fuel sufficiently (like a line next to an exhaust header
pipe) you can get vapor bubbles.
In Paul's case, I am not certain it was
vapor lock since he mentioned he found the his header tank cool to the touch.
Certainly not a definitive temperature sensor - but a reasonable one. Certainly
not to be discounted as a possible source of the problem and it possibility
needs to be confirmed or eliminated.
Ed, this was my experience, the vapor lock was in the
main line between the main tank and the sump tank, not in the EFI system.
This caused the sump tank to drain dry, fortunately on the ground. I think
this could have happened to Paul - because he had been running his engine
on the ground and generating a lot of heat, a vapor lock formed in the low
pressure input side of his sump tank such that it wasn't filling with fuel.
He suffered fuel exhaustion because the sump tank ran dry. He said his tank
is just 1.5 gallons, mine is 1 gallon. Just a theory...
Perry
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