Having a problem after engine,(sb350) is good and hot, will not start after sets 5 min or so without crankkkkking foot to floor.
Have rebuilt the 4bl qjet. Covered all that I thought would be related to carb itself.
Thinking that it might be related to the heat from the exhaust crossover??
I thought I had seen some discussion in the forum relating to this a short time back but can't find anything now.
Any help out there on this?
I've had the carb off about five times and still the engine floods when I shut it off. I proved that the fuel is passing through the carb into the engine by clamping off a rubber section of fuel line between the fuel pump and carb, waiting a half hour and then disconnecting the hose at each end of the clamp. The pump side still had pressure in it and the carb side did not.
So far I have
1 - Cleaned and rebuilt the carb with kit
2 - Installed 1/4" paper gasket under carb
3 - Installed metal plugs in heat ports in manifold
4 - Installed new float needle and seat and gasket with Cliff's improved seat (no fuel inlet windows)
5 - adjusted new brass float leaner that specs (I forget the exact measure offhand)
6 - installed new fuel pump
I even checked the plugs carefully in the bottom of the float bowl by spraying soapy water on the plugs and blowing compressed air into the jet openings inside the bowl. It's a 1974 carb with the improved plugs and they look good.
All this work and still the carb floods the engine and loses float bowl pressure. The engine starts great shortly after stopping and runs great but floods when left to stand a while. Does anyone know what I missed? I'm stumped.