Quote:
Originally Posted by Gaz64
We need to work out whether the fuel is leaking internally or evaporating (or both).
If you cold start the engine and run for a short period without putting a lot of heat into the engine, then let it sit for 2 days, do the float levels stay correct or drop down as stated?
If they do drop, I'd look at the power valve gaskets and/or the power valve diaphragms for leaks.
If they don't drop, then I'd be looking at adding a phenolic or wood carburettor spacer to help insulate the carb from the engine temperature at hot shutdown.
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Good post thank you. So here's my experience based on the two scenarios you provided
1) hot shut down, engine
oil temp 180-200F. Within 1 hr fuel levels in the bowl are no longer visible and if I take the air cleaner off I can see the vapor rising from carb. But at this 1 hr mark if I give it 1 pedal push it will crank for 1 second and start up with no stumble or smoke
2) cold shut down, ambient temp. With in 48 hrs the fuel in the bowls is no longer visible. It's at this point where the problem to start begins to occur.
But the question is why is it not flooding when it's hot but it floods on the 2nd and 3rd try when cold. I should also note that when I got the car in October I had none of these issues, but beginning in November we switch to winter grade blend in CA. Not sure it's the cause but that is when this cold start issue began.