FUEL INJECTION
Page 3B-10 90-883728 JULY 2001
Electronic Fuel Injection (EFl) System
Introduction
The troubleshooting information provided here consists of preliminary checks (checks to
be followed before proceeding with EFI tests), diagrams (fuel flow and electrical wiring),
component description (from diagrams), flow charts (low pressure fuel delivery, high pres-
sure fuel delivery, fuel delivery vs. electrical delivery), problem diagnosis, and a series of
test and check procedures that will help isolate problems associated with the fuel injection
system. Each test/check (listed) can be completed without major fuel system disassembly.
Using the Test Procedures
Read the entire test before beginning to perform outlined procedures. Study the RESULTS
material prior to testing. This will help in determining that each test is providing desired
results.
EFI System Tests
• EFI Electrical System and ECM Check
• Fuel Gauge Connection/Pressure Test
• Vapor Separator Fuel Delivery Test
• Vapor Separator Float Test
• Water Separating Filter Flow Test
• Pulse Fuel Pump Delivery Test
• Final Filter Check
• Fuel Pressure Regulator Test
• Electric Fuel Pump Test
• Injector Electrical Test
• Injector Fuel Delivery Test
• Injector Operating Test
• Induction Manifold Leak Check
• Sensor Tests
Safety Precautions
CAUTION
Always use approved safety glasses or goggles when working on pressurized fuel
systems.
DANGER
Motor fuels are extremely flammable. Do not show open sparks or flames when
working near fuel systems.
WARNING
To avoid potential fire hazards, use extreme caution when connecting and discon-
necting fuel line connections and test adaptors. Do not allow fuel to spill on hot
engine parts or on live electrical connections.
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