Sounds like you have a tank pressure problem because of the smoke system. I'd put a third fuel line in the tank for refueling and then add a check valve to the smoke pump output line.
CR
Gary Kaufman wrote:
heres the equipment:
>
> Saito 180, tme smoke, slimline pitts smoke exhaust with
> preheater integral, engine in hanger 9 edge540, mounted sideways >
> problem, cant get the damn thing primed to start, i can cover the exhaust
> with my hand and turn the prop and
> slowly get fuel to carb but then the fuel gets sucked back about 4 inches
> from the carb, im using large fuel line also,
> i have come to the end of my patience and removed the smoke system and
> muffler, went back to stock exhaust and the engine fired right up, BTW, the
> few times i did get the motor going with the smoke setup it was awesome
> but then i couldnt get it running agin, ive tried check valves but
> they interfere with fueling the plane through the large dubro fueler,
> incedently i bypassed the feuler valve often timesduring troubleshooting >
> any help ar advise is greatfully accepted
>
> gary
>
>