Dave---You wrote that a "leaking jet cannot be the source of gas in the oil" on
the Stromberg or SU carburetor. It's been a while since I've dealt with the the
former, but I can vouch that a stuck open float needle will certainly cause the
excess fuel to come up thru the jet on the SU and (ultimately) into the engine.
Without the shutoff feature that the float and needle seating provides when a
certain level is reached, the fuel has to go somewhere. This assumes that the
fuel level in the tank is higher than the outlet in the carburetor. In an
engine running at any speed, the overflow would occur faster.
I can't think of a reason that the same scenario wouldn't occur with the ZS
carb.
Dick
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