912uls Fuel Flow
in 912 / 914 Technical Questions
12 years ago
I am testing fuel flow on a newly built Zenith CH750. I have 17GPH flow from the line at the carb. with the electric pump on and with the fuel flowing through the mechanical pump (engine not running). If I shut off the fuel pump and allow only gravity to feed fuel I get only 2.3GPH.(engine not running) This seems low. The wing tanks have only one gallon of fuel in each (one tank per wing) so the amount of "head pressure" is minimal.The bypass valve in the electric fuel pump is working correctly as I get good fuel flow after the electric pump with the pump not running.I am wondering if this is acceptable and normal?? Ideas,comments,suggestions appreciated.
