PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 1
Nov 30/06
2J11
28-00-00
GENERAL
WARNING: FAILURE TO CONSULT APPLICABLE VENDOR PUBLICATION(S), WHEN SERVICING
OR INSPECTING VENDOR EQUIPMENT INSTALLED IN PIPER AIRCRAFT, MAY
RENDER THE AIRCRAFT UNAIRWORTHY. (SEE INTRODUCTION - SUPPLEMENTARY
PUBLICATIONS.)
This chapter contains information on fuel tanks, selector valves, filter screens, and fuel pumps.
Instructions are given for difficulties which may arise in the normal operation of the fuel system.
Carburetor maintenance is found in Chapter 73, Engine Fuel and Control.
1. Description (See Figure 1.)
NOTE: See Chapter 12 for anti-icing fuel additives information.
PA-28-161, Warrior III, airplanes are equipped with aluminum fuel tanks consisting of one in the inboard
leading edge section of each wing. Each tank has a capacity of 25 gallons, of which 24 gallons are
usable. A strainer is installed in the fuel outlet of each tank. A fuel line is routed from the tank outlet
through the wings to the fuel selector valve located on the left side of the cabin in front of the pilot’s seat.
A line from the fuel selector valve leads to the fuel strainer bowl mounted on the left forward face of the
firewall. From the strainer bowl a fuel line is routed to the electric fuel pump, the engine driven fuel pump,
and then to the carburetor and fuel inlet port.
The electric fuel pump is installed on the left forward side of the firewall. The outlet port on the pump is
equipped with a tee. One side of the tee is routed through the engine driven pump to the carburetor The
other side of the tee is routed through the primer solenoid valve (clamped to the left side engine mount)
to cylinders 1, 2, and 4. In the event of engine driven fuel pump failure, the electric fuel pump can be
activated continuously by an ON-OFF rocker type FUEL PUMP switch located in the switch panel
The electric fuel primer system may be used for cold engine start. A push ON, spring loaded OFF primer
(PRIME) switch, located just above the magneto/ignition switch on the instrument panel, is used to
activate the system. When pushed and held in, the switch activates a relay, which bypasses the FUEL
PUMP switch, and operates the electric fuel pump. At the same time, a solenoid valve is opened
electrically, permitting liquid fuel to be pumped directly to cylinders 1, 2, and 4.
The Warrior III has two electrical fuel gages, mounted in a common instrument, located on the lower
right side of the pilot’s instrument panel. The gauges are connected electrically to a transmitter unit
installed in each tank.
2. Troubleshooting
See Chart 1.
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