4-40 FUEL PUMP (CONT)
The following test also tests the fuel control valve.
2. Pressure gauge
Remove pipe plug (2) and install elbow
pressure gauge (4) on elbow.
Do not operate heater In enclosed space. Adequate ventilation is re-
quired to prevent buildup of exhaust fumes which can be toxic in con-
Wear approved ear protection equipment within 25 feet (7.6 meters) of
operating heater. Failure to do so may result in impairment or loss of
The heater must be at ambient temperature at beginning of this test.
3. Engine startup
Start engine and allow to warm up.
4. Burner control
Press down on burner control knob (5) and observe
through inspection port (6) that combustor ignites.
5. Temperature in-
Set temperature indicator knob (7) at highest setting
by rotating handle (8) clockwise.
6. Pressure gauge
Observe pressure gauge (4). Pressure should read 135
to 150 psi (931 to 1034 kPa).