Fuel Supply System
System Troubleshooting Guide
NOTE: Across each row in the chart, the sub-systems that could be sources of a symptom are ranked in the order they
should be inspected starting with . Find the symptom in the left column, read across to the most likely source, then
refer to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system
, etc.
PAGE SUB-SYSTEM
FUEL
INJECTOR
FUEL
INJECTOR
RESISTOR
FUEL
PRESSURE
REGULATOR
FUEL
FILTER
FUEL
PUMP
PGM-FI
MAIN
RELAY
FUEL PUMP
RELAY
FUEL PUMP
RESISTOR
CONTAMI-
NATED FUEL
SYMPTOM
ENGINE WON’T START
DIFFICULT TO START ENGINE
WHEN COLD OR HOT
ROUGH IDLE
107 112 113 114 115 120 116, 124
POOR
PERFORMANCE
MISFIRE OR
ROUGH
RUNNING
FAILS
EMISSION
TEST
LOSS OF
POWER
System Troubleshooting Guide
NOTE: Across each row in the chart, the sub-systems that could be sources of a symptom are ranked in the order they
should be inspected starting with . Find the symptom in the left column, read across to the most likely source, then
refer to the page listed at the top of that column. If inspection shows the system is OK, try the next most likely system
, etc.
PAGE SUB-SYSTEM
FUEL
INJECTOR
FUEL
INJECTOR
RESISTOR
FUEL
PRESSURE
REGULATOR
FUEL
FILTER
FUEL
PUMP
PGM-FI
MAIN
RELAY
FUEL PUMP
RELAY
FUEL PUMP
RESISTOR
CONTAMI-
NATED FUEL
SYMPTOM
ENGINE WON’T START
DIFFICULT TO START ENGINE
WHEN COLD OR HOT
ROUGH IDLE
107 112 113 114 115 120 116, 124
POOR
PERFORMANCE
MISFIRE OR
ROUGH
RUNNING
FAILS
EMISSION
TEST
LOSS OF
POWER