T337B Fuel Problem

[big al 08]

if it ia at lower setting you maybe sucking air. at higher there is an abundance of fuel, more that is required. at the lower settings you can create a slight vac. and if there is a leak it will suck in air and super lean the engine. look at the fuel strainer for stains, almost nobody rebuild them and the "o" ring get hard and lose thier seal. check the fuel pump, there are two bearing seals in the casing next to the engine?