Removal And Installation Of The Fuel Flow Sensor Probe; Removal And Installation Of Warning Indicator Housing; Removal Of Fuel Filter; Disassembly Of Fuel Filter - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
9-39. REMOVAL AND INSTALLATION OF THE FUEL FLOW SENSOR PROBE. Removal is
accomplished by the following:
a. Remove the cover plate aft of the fuel quantity sender.
b. Disconnect the electric wires and remove bolts.
c. Remove sensor probe from cell.
d. Installation is the reverse order of steps a through c.
e. There is no adjustment of the switch; replace if defective.
9-40. REMOVAL AND INSTALLATION OF WARNING INDICATOR LAMPS. Each individual
warning indicator has a spring-loaded mechanism which allows easy access to the lamps. A small release
located on the inboard side of the indicator, when pushed, allows the indicator to pop out and to swing
outboard, exposing the lamps. The lamps can then be pulled out of the back of the indicator and new ones
inserted. To close, push indicator back into original position until it latches.
9-41. REMOVAL AND INSTALLATION OF WARNING INDICATOR HOUSING. Removal is
accomplished by the following:
a. Remove the two screws on each side of the housing.
b. Pull housing out far enough to disconnect connector E322 and remove.
c. Installation is the reverse order of steps a and b.
9-42. FUEL FILTER.
9-43. REMOVAL OF FUEL FILTER. (Refer to Figure 9-9.) The instructions given are for the removal of
the complete filter from the airplane. For cleaning and servicing purposes only, steps a and b of this paragraph
are necessary; then proceed to paragraph 9-44.
a. Turn the fuel selector valve to the OFF position.
b. Remove the access panel forward of the main spar, between the underside of the wing and the
fuselage.
c. Disconnect the electrical leads to the fuel pump.
d. Disconnect the fuel lines to the filter and fuel pump. Cover the line ends to prevent
contamination.
e. Remove the bolts that secure the filter and pump to their mounting brackets.
f. Separate the filter from the fuel pump.
9-44. DISASSEMBLY OF FUEL FILTER. (Refer to Figure 9-11.)
a. Cut safety wire (17) and remove cap nut (7) from the bottom of the filter bowl (15).
b. Remove the bowl from the filter body (1).
c. The O-ring seal (2) may be removed from the body.
d. Loosen and remove both the check nut (14) and nut (4) from the stud (5) that holds the filter
cartridge subassembly.
e. Slide the filter cartridge from the stud. The filter discs (11) and washers (12) need not be
separated from the element outer tube (3) for normal cleaning.
f. If necessary to disassemble the filter cartridge, remove the retainer cup (13) from the outer tube
(3) and slide discs (11) and washers (12) from the outer tube. Do not use a screwdriver or sharp tool that
may damage the discs.
g. The filter bypass assembly may be removed by using the proper size screwdriver and turning out
the relief seat (10). Remove relief ball (9) and spring (8).
Reissued: 9/23/80
FUEL SYSTEM
2K23