Diagnosis And Testing - High-Pressure Fuel Line Leaks

Fig 1: Typical Test For Leaks Using Cardboard

Courtesy of CHRYSLER GROUP, LLC

1 - HIGH-PRESSURE LINE

2 - CARDBOARD

3 - TYPICAL HIGH-PRESSURE FITTING

WARNING:

Due to extreme fuel pressures of up to 1800 bar (26, 106 psi), use extreme caution when inspecting for high-pressure fuel leaks. Do not get your hand or a finger near a suspected leak. Inspect for high-pressure fuel leaks with a sheet of cardboard (2) (typical illustration). High fuel injection pressure can cause personal injury if contact is made with the skin.

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.

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

Start the engine. Move the cardboard (2) over the suspected high-pressure fuel line leak, and check for fuel spray onto the cardboard. If line is leaking, retightening line while engine is shutdown. Replace damaged, restricted or leaking high-pressure fuel lines with the correct replacement line.