THRUSH AIRCRAFT, INC – MODEL S2R R1340
AIRCRAFT MAINTENANCE MANUAL
Effective: 01/01/08
5-15
PROBLEM PROBABLE
CAUSE
REMEDY
No fuel flow to
engine.
(Continued)
Fuel line plugged.
Starting at fuel pump inlet, disconnect
fuel lines successively until plugged line
is located. Clean out or replace fuel line.
Fuel starvation
after starting.
Partial fuel flow from the
preceding causes.
Use the preceding isolation procedures,
checking for sufficient rate of flow. Using
the preceding remedies.
Malfunction of engine-
driven fuel pump.
Check pump outlet during starting.
Replace fuel pump. See Section IV.
Fuel vents plugged.
Check ram air inlet for blockage.
Pressure check each vent line. Clean or
replace vent line.
No fuel flow
when auxiliary
pump is turned
on.
Defective electric
auxiliary fuel pump
switch.
Check continuity of switch. Replace
defective switch.
Open or defective
circuit breaker.
Check visually. If not open, check
continuity. Reset. Replace if defective.
Loose connections or
open circuit.
Check connections and wiring. Tighten
connections; repair or replace wiring.
Defective auxiliary fuel
pump.
Disconnect outlet line. With proper fuel
supply to pump, fuel under pressure
should flow from outlet. Replace
defective pump.
Defective engine-driven
fuel pump by-pass
valve.
Check pump outlet during starting. See
Section IV and replace fuel pump if by-
pass valve is defective or installed
backwards.
Fuel flow
indicator
inoperative.
(Optional Equip)
No voltage to indicator.
Check voltage and ground wire. If
voltage is present and ground is good,
replace indicator, maintaining the same K
factor.
Fuel flow
Indicator comes
on but will not
show fuel flow.
(Optional Equip)
Bad wires to transducer
or defective transducer.
To check transducer, remove four screws
holding wire housing to flow vane
housing. With battery power on, pass
screwdriver back and forth over wire
housing pickups. You should get a
reading on indicator. If no reading,
replace units.
