Monticello Flying Club Pilot Transition Manual: Mooney M20F
Page 14 of 42
engine-driven fuel pump and to the fuel injector system on the engine. Fuel quantity transmitters
in each tank are wired to fuel quantity gauges in the engine cluster gage. The aircraft master
switch turns on the fuel quantity indicating systems.
Fuel System Schematic
On our aircraft, a Bendix RSA-5AD1 fuel injection system uses measured airflow in a
stem-type regulator to convert the air pressure into a fuel pressure. This fuel pressure differential
is applied across the fuel metering section of the fuel injector, making fuel flow proportional to
airflow. The injection system is composed of the injector, flow divider, air-bleed nozzles, and
associated lines and fittings.
The Lycoming fuel injection controls on M20E, F and J models do not include an engine
primer. Fuel will be sprayed into the intake manifold whenever a fuel pump is operating and the
mixture control is open. Thus proper positioning of the mixture knob is critical for insuring the
engine is properly primed but not flooded.
RAM-AIR SYSTEM
The ram-air feature was incorporated with the 200 horsepower engine in M20E and later
models, including M20J production through 1991. It provides a 1" manifold increase by allowing
engine induction air to partially bypass the induction air filter (see schematics below). Use of
ram-air must be strictly limited to clean, dust-free air, as the engine operates on direct unfiltered
air when the ram air control is pulled on. RAM air must also not be operated in clouds below 40
degree F due to the risk of freezing at the injection ports.
If the ram-air is on while the landing gear is down, the ram-air annunciator light will
illuminate, reminding you that you should close the ram air door. Do not wait for this light; close
the door just prior to starting the descent. Should the induction air filter clog, a spring-loaded
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