Ok, once I started to suspect that I didn't have an air leak but just boiling
fuel,
I decided to do a simple test (should have thought about that earlier): I
connected one of these glass filters to the fuel inlet of the engine, so I could
see what the engine was getting.
While the inlet filter looked like I was pumping foam, the filter at the inlet
of the engine showed that the engine was only getting liquid fuel, without a
single
bubble of air...
Now I have determined that I have no air leak but simply that my fuel is boiling
due to underpressure at the suction side of the fuel system, I have some further
questions:
1) Is this nornal, or do I have bad fuel, or for some reason too much
underpressure
that is causing this? With other words, do I have a problem?
2) At altitude, the pressure will be even lower, hence the fuel will boil
earlier.
Today is a nice fall day, but the temperatures are nowhere as high as I'm
going to experience during my flights in the south of Europe. Isn't it likely
that some of the vapour bubbles will make it into the carbs once the conditions
go "worse"? Once you have vapour, the bubbles tend to grow rather than to
dissolve.
It just doesn't look good that the fuel is already boiling at this comfortable
but not too high a temperature at 10 ft AMSL...
Frans
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