ORIGINAL: dave_anderson
I often wonder... would putting a check valve between the pressure tap on the muffler and the tank vent line crate a situation where the tank would hold pressure even when the throttle is pulled back? Sort of a weak YS pressurized pump setup. After shutdown I'd have to relieve the tank pressure (like a YS) if there were any left.
Dave,
Impossible.
The tank pressure is related to the power level of the engine on any different moment. Idle, low pressure, full power higher pressure.
The tank pressure
has to be released to the muffler in idle situation in all positions, that’s why the location of the tank in the fuselage is important. To prevent the engine gets too much fuel in nose down idle situation. Because the hydrostatic pressure can be high related to the (low) sucking pressure of the engine in that situation.
A check valve I use combined with the fuel pressure regulator so I do have enough pressure also in nose up situation to feed the carburetor.
So my Taurus can have a nearly unlimited time in nose up and nose down position after idling the engine.
When using a check valve you will measure a much higher pressure level than with the “uncheckvalved” connection but the carbs all are designed to work without a check valve!!!!
Cees