CHAPTER 73
PAGE 17
MAINTENANCE MANUAL EXTRA 300SC
PAGE DATE: 1. August 2014
73-30-00 INDICATING
Fuel pressure is sensed on the EXTRA 300SC engine and is
indicated to the pilot in command.
Trouble Shooting
Trouble Possible Cause Remedy
No fuel pressure indication Gauge defective Replace gauge
Fuel pressure low Orifice in engine fuel
pressure fitting defective Clean fitting
Sense line leakage Replace sense line
73-30-10 Fuel Pressure
The fuel pressure gauge is located in the instrument panel.
The instrument takes fuel pressure from the sense line (refer
to figure 8).
Because the fuel flow to the engine cylinders is restricted,
there is a direct relation between fuel pressure and fuel flow.
This relation is shown on the Lycoming curve N° 13011 "Fuel
Flow vs. Nozzle Pressure". So the fuel pressure gauge indicates
fuel pressure but on a scale which is converted to fuel flow
values (generally the fuel flow value is more useful for the
pilot). The red line however shows a pressure value.
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