Dear John,
you know that you have gasoline in your oil, if the oil level in the
sump increases. Another (not so safe) sign is the odor and the
viscostiy. If the oil smells like gasoline and if is very "thin",
than you have gas in the oil.
Note that in WW2 the Germans filled up to 30 percent gasoline in
the oilsump of their aircraft and vehicle engines, to make the oil
thinner in the cold of the Russian winter. When the engine warms up,
the gasoline vaporizes and the oil is as it was before.
Today you can get gasoline in your oil, if you drive your car with
a too fat mixture, for example you drive with closed choke flap, or
if your engine doesn't become hot enough. (Short distance driving).
Another reason may be the diaphragm of the fuel pump, but some
mechanical fuel pumps have a tell-tale-hole, where the fuel can flow
out, before it comes in contact with the engine oil.
Leaks of the fuel pump are a problem of the supercharged Mercedes-Benz
cars of the 30s. They have a very complicated piston fuel pump and when
this pump is worn out, fuel gets into the oil.
Regards from Germany
Andreas Mehlhorn
1942 NSU Kettenkrad (under construction)
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