just got my jeep converted over to propane. forklift tank, vff 30, impco model e and impco 425 on a 258 i6. itll only start if I push the primer button on top of the model E. once started if you let it die, gotta prime it to start again. it wont idle either. messed with the timing and its not dialed in perfect but its pretty good. could it be a timing issue or maybe need to rebuild the model e or 425?