Fuel Supply System — System Troubleshooting Guide
6-70spec tableSystem Troubleshooting Guide
NOTE
Across each row in the chart, the systems that could be sources of a symptom are ranked in the order they should be inspected starting with ①. 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 ②, etc.
Engine won't start
Fuel Injector (page 72)
Injector Resistor (page 76)3
Pressure Regulator (page 76)
Fuel Filter (page 77)3
Fuel Pump (page 78)1
Main Relay (page 79)2
Fuel Tank (page 81)
Contaminated Fuel (*)
Difficult to start engine when cold
Fuel Injector (page 72)3
Injector Resistor (page 76)
Pressure Regulator (page 76)
Fuel Filter (page 77)2
Fuel Pump (page 78)1
Main Relay (page 79)
Fuel Tank (page 81)
Contaminated Fuel (*)
Rough idle
Fuel Injector (page 72)1
Injector Resistor (page 76)
Pressure Regulator (page 76)2
Fuel Filter (page 77)
Fuel Pump (page 78)
Main Relay (page 79)
Fuel Tank (page 81)
Contaminated Fuel (*)3
Frequent stalling — while warming up
Fuel Injector (page 72)1
Injector Resistor (page 76)
Pressure Regulator (page 76)
Fuel Filter (page 77)2
Fuel Pump (page 78)3
Main Relay (page 79)
Fuel Tank (page 81)
Contaminated Fuel (*)
Frequent stalling — after warming up
Fuel Injector (page 72)1
Injector Resistor (page 76)
Pressure Regulator (page 76)3
Fuel Filter (page 77)3
Fuel Pump (page 78)2
Main Relay (page 79)
Fuel Tank (page 81)
Contaminated Fuel (*)
Poor performance — misfire or rough running
Fuel Injector (page 72)1
Injector Resistor (page 76)
Pressure Regulator (page 76)2
Fuel Filter (page 77)
Fuel Pump (page 78)
Main Relay (page 79)
Fuel Tank (page 81)
Contaminated Fuel (*)3
Poor performance — fails emission test
Fuel Injector (page 72)1
Injector Resistor (page 76)
Pressure Regulator (page 76)2
Fuel Filter (page 77)
Fuel Pump (page 78)
Main Relay (page 79)
Fuel Tank (page 81)
Contaminated Fuel (*)
Poor performance — loss of power
Fuel Injector (page 72)
Injector Resistor (page 76)
Pressure Regulator (page 76)3
Fuel Filter (page 77)1
Fuel Pump (page 78)3
Main Relay (page 79)
Fuel Tank (page 81)
Contaminated Fuel (*)2
NOTE
* Fuel with dirt, water or a high percentage of alcohol is considered contaminated.