Diagnosis And Testing - High Pressure Fuel Lines

DIAGNOSIS AND TESTING - HIGH PRESSURE FUEL LINES

WARNING: HIGH-PRESSURE FUEL LINES DELIVER FUEL UNDER EXTREME PRESSURE FROM THE INJECTION PUMP TO THE INJECTORS. THIS MAYBE AS HIGH AS 1600BAR (23,200PSI). USE EXTREME CAUTION WHEN INSPECTING FOR HIGH-PRESSURE FUEL LEAKS. FUEL UNDER THIS AMOUNT OF PRESSURE CAN PENETRATE SKIN CAUSING PERSONAL INJURY OR DEATH. INSPECT FOR HIGH-PRESSURE FUEL LEAKS WITH A SHEET OF CARDBOARD PLACED IN THE SUSPECTED AREA WHILE THE ENGINE IS NOT RUNNING. START THE VEHICLE AND ALLOW THE ENGINE TO RUN FOR A SHORT PERIOD. TURN THE ENGINE OFF AND INSPECT THE PIECE OF CARDBOARD. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING WHEN SERVICING FUEL SYSTEM.

High-pressure fuel line leaks can cause starting problems and poor engine performance.

- Turn the engine off.
- Place a piece for cardboard in the suspected area.
- Start the engine and allow to run for a short period.
- Turn the engine off.
- Inspect the cardboard.

If a high-pressure line connection is leaking, counterhold and tighten the connection to specification then perform this procedure again. Replace any damaged, restricted or leaking high-pressure fuel lines with the correct replacement line.





CAUTION: The high-pressure fuel lines cannot contact each other or other components. Do not attempt to weld high-pressure fuel lines or to repair lines that are damaged. Only use the recommended lines when replacement of high-pressure fuel line is necessary.