29-05-2021, 10:41 PM
Why is the first suggestion not viable, it is the most obvious? Has the diaphragm been changed for one to use with unleaded/ethanol fuel? Has it been renewed within living memory? Has it been checked for holes and tears? Fuel that passes the diaphragm, will drain through the body of the pump directly into the sump.
I don't think the 2nd explanation is at all likely, unless you are parking facing down hill on a 45 deg slope.
The last idea is possible, but the likely amounts that might pass in this way are small in my view, however you would need to say more about how much the level is rising.
You do not say how much fuel is present or in what period of running or simply standing still, I think a few more clues are necessary to be able to provide a proper diagnosis.
I don't think the 2nd explanation is at all likely, unless you are parking facing down hill on a 45 deg slope.
The last idea is possible, but the likely amounts that might pass in this way are small in my view, however you would need to say more about how much the level is rising.
You do not say how much fuel is present or in what period of running or simply standing still, I think a few more clues are necessary to be able to provide a proper diagnosis.