Hi,

With pumped Surpass 91-II, do i need a fueling valve or can i just use a plugged T-extension in the fuel line for fueling: will the pump-system cut fuel flow into the engine when engine is not running and filling up the tank.

Thanks.

ff9

ff9,

Many times, people use 3 lines on the O.S. pumped engines. One is the fuel pickup, one is the vent, and the other is a filler that is capped-off with a fuel dot.

You could put a fueling valve in the fuel pickup line, but some of the fillers will be sucked open by the fuel pump and then allow air into the system, making the engine go lean.

Putting a 'T' in the line will force fuel through the pump into the carb, and then out the air intake. Filler pressure is high enough to do that.

With a 3-line tank, the vent must go from top forward inside the tank and exit the bottom of the cowl or fuselage. The filler line usually dumps at bottom forward in the tank.

Is there any harm connecting the vent-line into the exhaust pipe or muffler, is the pressure problem to the pump? The idea is to route overfill fuel into exhaust pipe since oil residue already goes there.

You don't want to pressurize the fuel tank on pumped engines. Just use the modern practice of collecting overflow fuel in a bottle so that you can safely discard it.

Thanks, i really appreciate a guru like you humbly answer our stupid questions over and over againg. Thanks again, this is a great site im happy i found it.

ff9
Finland (the little country in the northern europe which beats your US and Canadian asses in the hockey-games)