Subsection 02 (FUEL TANK AND FUEL PUMP)
TROUBLESHOOTING
FUEL SYSTEM DIAGNOSTIC FLOW CHART
Repair or
replace
Replace fuel
pump module
FUEL SYSTEM OK
Retest
Replace fuel
pump module
Activate electric system to ena
b
le fuel pump
Fuel pump does not run
Fuel pump runs
for 2 sec. then stops
Install fuel pressure gauge
on fuel pressure line
Check fuse, relay and connections.
Check fuel pump operation.
Repair or replace if necessary.
Fuel pressure within
specifications
Fuel pressure more
than specifications
Fuel pressure less
than specifications
Perform fuel pump test
Check fuel line/
rail for leaks
Fuel pressure less
than specifications
Fuel pressure more
than specifications
Check fuel
injector
Fails
Activate electric system to ena
b
le fuel pump
Fuel pump runs
Fuel pressure within
specifications
OK
OK
Yes
No
Check
fuel line/
rail for leaks
Repair or
replace
OK
Fails
Perform fuel
pump test
OK
Fast
pressure drop
Verify fuel
pump check
valve
OK
Fails
Fails
OK
Fails
Crank or
start
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