Mooney M20V - Page 260

MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Page
Date
13
MAR 2017
Rev Date
28-91-00 - TROUBLE SHOOTING - FUEL SYSTEM
TROUBLE
PROBABLE CAUSE REMEDY
Fuel gauge not indicating.
Broken wire. Check and repair.
Faulty transmitting unit. Replace and adjust.
Open circuit breaker. Check and reset.
Fuel gauge indicates
FULL when tanks are not
full.
Incomplete ground. Check ground connection at transmitter.
Broken wire. Check and repair.
No fuel pressure indica-
tion.
(calibrated test gauges
connected)
Tank empty. Check and service tank.
Defective fuel pump(s). Check boost pump for proper pressure buildup. Check
for obstruction in boost pump screen. Inspect engine fuel
pump and check valve.
Open fuel line. Repair or replace line.
Fuel selector in OFF posi-
tion.
Select proper position.
Fuel pressure low or
surging.
(Calibrated test gauges
connected).
Obstruction in inlet side of
pump. Faulty engine pump.
Check and clear fuel lines. Replace or rebuild pump.
Inspect fuel lines and connections for leakage and dam-
age.
Fuel selector not in proper
position.
Select proper position.
Air leak in system. Repair leak.
Refer to Garmin G1000 service literature for additional Fuel System Troubleshooting.
28-92-00 - FLARED FITTINGS
When installing flared fittings and hoses, make sure
threads are properly lubricated “Parker Thread Lube”
or equivalent (Figure 28- 5). When previously installed
fittings are removed, they should be wiped clean and
relubricated before they are reinstalled. Torque all fit-
tings in accordance with flare fitting torque chart, Chap-
ter 5, Figure 5- 1.
-CAUTION-
Exercise extreme caution to avoid “stringing”
sealer across the ends of the fittings.
Fuel system pipe thread connections should be lubri-
cated and sealed with Permatex Anti- Seize Lubricant
(part no. 133H or 133K) or Loctite Silver Grade Anti-
Seize Lubricant. Apply lubricant to male fittings only,
omitting first two (2) threads.
STRAIGHT
TAPERED
THREADS
THREADS
PIPE
NEVER ALLOW LUBRICANT
LUBRICATE
DO NOT
LUBRICATE
FEMALE
THREADS
TO CONTACT THESE
SURFACES
LUBRICATION OF FLARED FITTINGS
FIGURE 28- 5
28-91-00