ORIGINAL: preivers
Chuck the pump. and set it up with a normal carb-tank setup.
Less factors to mess up, and known to run well.
P.S.
Also known as the KISS principle.
" Keep It Simple S***** "
*** means whatever feels right.
Serious now.
I have never seemed to get these pumps right. They either flood the engine when you play with them during the starting procedure, or they make a fool of you during flight, not to say they can ruin your engine.
The pump without the fuel demand regulator is one way to skin a cat I do not like at all when using alky engines. There are better ways. Much better ways I dare say.