THRUSH AIRCRAFT INC – MODEL S2R R1340
AIRCRAFT MAINTENANCE MANUAL
5-14
Effective: 01/01/08
Table 5-2: Fuel System Trouble Shooting Chart
PROBLEM PROBABLE
CAUSE
REMEDY
No fuel quantity
indication.
Fuel tanks empty.
Check fuel quantity. Service with proper
grade and amount of fuel.
Fuel quantity indicator
circuit breaker open or
defective.
Check visually. If not open, check
continuity. Reset. Replace if defective.
Defective fuel quantity
indicator or transmitter.
Disconnect wire from transmitter at
indicator not registering and attach it to
an indicator that is registering. If
indicator does not register, transmitter is
defective. If the new indicator registers,
the existing indicator is defective.
Replace defective transmitter or
indicator.
Loose connections or
open circuit.
Check connections and wiring. Tighten
connections; repair or replace wiring.
Left and right fuel
quantity indicator switch
defective.
Check continuity and replace if defective.
No power to gauge.
Check power to gauge. If no power,
check for defective circuit breaker.
Power, ground and
transmitter checks
good.
Circuit board on rear of gauge defective.
(Replace board) or entire gauge.
Fuel indicated
full at all times.
Open ground between
gauge and transmitter.
Check ohms to transmitter. Check for
broken wire. Transmitter should read 0
ohms when fuel tank is empty and 33
ohms when fuel tank is full.
No fuel flow to
engine.
Fuel tanks empty.
Check fuel quantity. Service with proper
grade and amount of fuel.
Fuel line disconnected
or broken.
Inspect fuel lines. Connect or repair fuel
lines.
Header tank outlet fuel
strainers plugged.
Disconnect fuel lines from tank outlets.
No fuel indicates plugged strainers.
Remove and clean strainers and flush
out tanks.
Fuel filter element
plugged.
Inspect filter element. Clean or replace
filter element.
