[s-cars] Humming after shut off

[Dave Forgie]

Buffalo Spring Field.  Neil!!  Far out, man!!  Groovy. (N'stuff)

Bob:  I get the same noise some times, I think it is the air pressure equalizing in the tank, i.e. while the fuel pump is running the tank is under a slight negative pressure.  When you shut the motor (and fuel pump) off, this negative pressure has to equalize back to atmospheric and what you hear is air leaking in through the overflow vent (or something like that).

But I am just guessing.

Dave F.


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