4-40 FUEL PUMP (CONT)
Install new fuel control valve
(21) using fluid passage bolt
(15) and preformed packing
(16). Connect fuel tube (11)
using tube nut (12). Connect
fuel tube (13) using tube nut
Install burner control knob
(5) and tighten setscrew (10).
Set temperature indicator knob
(7) at highest setting.
and probe do not need to be installed for this test.
Lay carefully to one side.
17. Pressure gauge
plug (2) and
(3) and pres-
sure gauge (4).
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
18. Fuel pump
Start engine and retest. If pressure pump is adjust-
able to 135 to 150 psi (931 to 1034 kPa) range,
fuel pump is not defective.
If fuel pump is not defective, complete installation of replacement burner
control valve as described in paragraph 4-44.