2. Apply Lubon No. 404 sealant to male threads of five bolts, and secure sender unit to tank. Remove any
excess sealant from bolts before and after installation.
—NOTE—
Ensure that correct arrangement of washers and insulators are
used upon installation of sender units. Tighten bolts to a torque
of 20 to 25 inch-pounds.
3. Before installing tank, ensure that transmitter wire is connected to transmitter.
4. Install tank. (Refer to Installation of Fuel Tank.)
FUEL QUANTITY SENDER/GAUGE CHECK (INSTALLED)
Fuel quantity sender units and fuel quantity gauges are checked while mounted in the airplane as follows:
1. Put fuel selector lever to OFF position. Completely drain fuel tank that relates to 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 aircraft with a 1° nose up attitude.
—NOTE—
The electrical system must supply 12 to 14-volts to gauge.
3. With the master switch set OFF, gauge needle should be centered on white dot to the left of O radial
mark, with a maximum deviation of 1/2 needle width. If not within this tolerance, gauge should be
replaced.
4. With master switch set ON and no fuel in tanks, gauge needle should be centered on white dot to left
of O radial mark with a maximum deviation of 1/2 needle width. If not within tolerance, gauge should
be replaced.
5. Place 2-1/2 gallons of fuel in wing fuel tank that relates to gauge and sender unit being checked.
6. With 12 to 14-volts dc supplied to electrical system and master switch set ON, needle should be
centered on O radial mark; +0, -1/2 needle width.
7. If needle does not read within above tolerance, remove sender wire from rear of gauge and check
resistance to ground through sender circuit. If resistance is not within 6.5 ± 0.5 ohms, replace sender.
Then, recheck.
8. Add fuel to tanks in accordance with the information in chart 2802 until tanks are full. Observe gauge
reading at each increment.
9. With tanks full and master switch ON, needle should be centered on F radial mark within ± 2 needle
widths. If not within this tolerance, adjust electrical adjustment (refer to figure 28-5) to bring it within
tolerance; do not center needle.
28 - 41 - 00
Page - 28-14
Reissued: August 1, 1986
2B8
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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