Post by jarden29 on Aug 31, 2020 15:32:35 GMT -5
I have a 4412 on a dirt track car and it started turning the exhaust manifolds cherry red at the collector..took car to dyno and 1st pull it show lean all the way across the spectrum. We immediately went from 89 jets to 99 jets and the fuel curve barely changed. We even changed power valves and no significant change.. im thinking fuel pump flow rate issue. Any thoughts