Piper Arrow IV, Maintenance Manual

Page: 316 / 752

INDICATING.
FUEL QUANTITY TRANSMITTER UNIT.
REMOVAL OF FUEL QUANTITY TRANSMITTER UNIT.
1. Remove the fuel tank. (Refer to Removal of Fuel Tanks.)
2. Disconnect the transmitter wire from the connection post.
3. Cut the safety wire which secures the five attaching screws.
4. Remove the five screws and remove the unit.
INSTALLATION OF FUEL QUANTITY TRANSMITTER UNIT.
1. Position the transmitter and gasket to the fuel tank and secure with machine screws and washers.
2. Safety the machine screws with MS20995-C32 wire.
3. Install the fuel tank. (Refer to Installation of Fuel Tank.)
FUEL QUANTITY SENDER/GAUGE CHECK. (Installed)
Fuel quantity sender units and fuel quantity gauges can be checked while mounted in the airplane by using
the following procedure:
1. Put the fuel selector levers in the “OFF” position. Completely drain fuel tanks that relate to the fuel
quantity senders and gauge to be checked. (Refer to Draining Fuel System, Chapter 12.)
2. Level airplane laterally (refer to Leveling, Chapter 8) and position the aircraft with a 1° nose up
attitude.
—NOTE—
The electrical system should supply 12 to 14-volts to the gauge.
3. With the master switch in the “OFF” position, the gauge needle should be centered on the white dot to
the left of the “O” radial mark, with a maximum deviation of 1/2 needle width. If not within this tolerance, the
gauge should be replaced.
4. With the master switch in the “ON” position and no fuel in the tanks, the gauge needle should be
centered on the white dot to the left of the “O” radial mark with a maximum deviation of 1/2 needle width. If
not within this tolerance, the gauge should be replaced.
5. Place 2-1/2 gallons of fuel in the wing fuel tank that relates to the gauge and sender unit being
checked.
6. With 12 to 14- volts DC supplied to the electrical system and the master switch in the “ON” position,
the needle should be centered on the “O” radial mark; plus 0, minus 1 needle width.
7. If the needle does not read within the above tolerance, remove the sender wire from the rear of the
gauge and check the resistance to ground through the sender circuit. If the resistance is not within 6.5 ± 0.5
ohms, replace the sender. Then, recheck as specified above.
8. Add fuel to the tanks in accordance with information given in Chart 2802 until tanks are full. Observe
the gauge reading at each increment.
9. With the tanks full and master switch “ON,” the needle should be centered on the “F” radial mark
within ±2 needle widths. If not within this tolerance, adjust the electrical adjustment (refer to Figure 28-8) just
sufficiently to bring it within tolerance; do not center the needle.
28-40-04
Page 28-18
Revised: December 21, 1981
2B13
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL