Fuel Tank Vent Pipes
05-31-2005, 11:06 AM
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Fuel Tank Vent Pipes
I remember a little tip I read somewhere here about running the tank vent line in a particular way so as to stop fuel venting out both in flight and whilst moving the model around on the ground.
I think the tip was to run strap the line on top of the tank, off the back and then down and out the fuse bottom.
Just wanted to know how well this works in practice?
Thanks,
Mark
PS Can you also please settle an argument - filling a DA-50 powered model through a T-piece in the fuel line to the carb will not flood the engine as it would with a glow engine will it due to the pump in the carb?
I think the tip was to run strap the line on top of the tank, off the back and then down and out the fuse bottom.
Just wanted to know how well this works in practice?
Thanks,
Mark
PS Can you also please settle an argument - filling a DA-50 powered model through a T-piece in the fuel line to the carb will not flood the engine as it would with a glow engine will it due to the pump in the carb?
05-31-2005, 12:15 PM
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RE: Fuel Tank Vent Pipes
Filling any gas engine with a pumped type of carb (Walbro, Tillitson, Zama, etc) through a "T" WILL NOT flood the carb. Period.
Running the vent line from the front of the tank, then looping the line back behind the tank and then again forward will lessen the fuel loss when the plane is in flight or tipped forward on the ground. It doesn't seem to matter much if the vent line goes over the tank or to the side of it. You're just making a "trap".
Running the vent line from the front of the tank, then looping the line back behind the tank and then again forward will lessen the fuel loss when the plane is in flight or tipped forward on the ground. It doesn't seem to matter much if the vent line goes over the tank or to the side of it. You're just making a "trap".
05-31-2005, 12:50 PM
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RE: Fuel Tank Vent Pipes
Filling with a T won't flood it, but it can weaken or destroy the diaphragm if you have a high pressure pump or a hand driven, unregulated pump.
3W strongly recommends NEVER to pressurize the feed line to fill the tank. Most of the larger 3W's have tillotsons.
I always run a 3-line tank setup and run two small coils in the vent line to prevent excessive leakage (you'll never stop it completely unless you have a closed system)
DP
3W strongly recommends NEVER to pressurize the feed line to fill the tank. Most of the larger 3W's have tillotsons.
I always run a 3-line tank setup and run two small coils in the vent line to prevent excessive leakage (you'll never stop it completely unless you have a closed system)
DP
05-31-2005, 10:20 PM
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RE: Fuel Tank Vent Pipes
Filling with a T won't flood it, but it can weaken or destroy the diaphragm if you have a high pressure pump or a hand driven, unregulated pump.
3W strongly recommends NEVER to pressurize the feed line to fill the tank. Most of the larger 3W's have tillotsons.
I always run a 3-line tank setup and run two small coils in the vent line to prevent excessive leakage (you'll never stop it completely unless you have a closed system)
3W strongly recommends NEVER to pressurize the feed line to fill the tank. Most of the larger 3W's have tillotsons.
I always run a 3-line tank setup and run two small coils in the vent line to prevent excessive leakage (you'll never stop it completely unless you have a closed system)
05-31-2005, 10:26 PM
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RE: Fuel Tank Vent Pipes
I don't think this is an issue on Walbro carbs. Before you go tearing apart your fueling setup PM RCIGN1 see what he says, or ask him to comment on this thread. I am only iterating what the 3W manual states. It may be fine on DA, etc.
DP
DP
