I tried everything, and they were all hooked up right. I even slowed the pump down with a voltage dropping resistor. I know alot of people who have these fuelers and they work great for them, so, Im going to just accept the fact that my Super (picky) Stearman / Saito 72 does not like them. Maybe more releif in the vent line might of helped, but I didn't think of that at the time. I have a simple coupler in the line now and it works fine. Perhaps I will play with it again at a later date, but for now, Im running out of hair to pull out and just want to fly. I left the fueler in the cowl just in case I get bored and need something to stimulate my brain. Dennis (Red Bluff)