I decided to use a 3 port fuel pump as a bypass regulator today,it works great. 1 hate running rubber line under pressure over the top of the engine so I was using a n original 2 port pump with no pushrod as a junction to my factory steel line. The fuel we have and the electric pump would blow the needle off the seat even,just parked when the fuel would expand. Put on a 3 port pump as a bypass regulator problem solved. This is useful info for anyone run running an electric pump or a 2 port pump,the 33041 3 port fuel filters are extinct nobody has them. What happens if you run an electric pump and deadhead it will make more pressure than the float can stop. But this is what I found out after the fuel vapor incident, if you park hot,the fuel we have now expands too much just with heat so the expansion blows the seat off and gives you a way too rich start. But with the 3 port In place when the needle closes the fuel bypasses through the return line. And when the fuel expands it bypasses instead of overfilling the float bowl. Learned it from the guy at carb shop in Eldon talking about people blaming plug well leaks not knowing its flooded fuel bowls. So far this is working great we used to do something similar at a shop I worked at,to reduce fuel when putting a carb on an injected model. We use to put in a tee run the dogleg back to the tank and put a redtrictor in the return line. This working great, did need to be restricted it was bypassing to much. I'm going to get a lawn mower fuel shut off valve to use where I've pinched my restriction.
