Thrush Aircraft S2R-R1340 Maintenance Manual page 122

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