THRUSH AIRCRAFT INC – MODEL S2R G10
AIRCRAFT MAINTENANCE MANUAL
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.
eft and right fuel quant.
ndicator 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 OK.
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 line from tank outlet. No fuel
indicates plugged strainer. Remove and
clean strainer and flush out tank.
Fuel filter element
plugged.
Inspect filter element. Clean or replace filter
element.
No fuel flow to
engine. (Cont’d)
Fuel line plugged.
Starting at fuel pump inlet, disconnect fuel
lines successively until plugged line is
located. Clean out or replace fuel line.
Page Effective: 03/26/2010 5-14
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