Fuel System Leak Detection
Test Conditions:
- Procedure for "Checking the fuel system for leaks" was performed. Refer to FUEL SYSTEM, CHECKING FOR LEAKS .
- : KLI9210 with : KLI9210/55-1 or : KLI9210/55-2 connected on the vehicle.
-- Connect the : KLI9210 to the vehicle battery.
-- Remove right rear wheel housing liner.
-- Remove the hose to the air filter -arrow- from the Leak Detection Pump -V144-.
-- Close the connection on the Leak Detection Pump -V144- with a plug -A-.
-- Set the valve -D- to "Test". The fuel system is now filled.
-- Watch the pressure gauge -C- and the flow meter -E-. The fuel system is filled if the flow rate decreases and the pressure increases to 10 in. H2O (25 mbar).
-- After the pressure has stabilized, set the valve -D- to "Hold".
- After five minutes, the pressure must not drop below 8 in. H2O (20 mbar).
If the Pressure Drops or If No Pressure Develops, Then Locate the Leak as Follows:
-- Set the valve -D- to "Test" and fill the system with smoke.
-- While the fuel system is being filled, press the smoke generator button -I- for approximately one minute.
The fuel system is now under pressure and filled with smoke.
-- Check all the lines, hoses and the fuel filler cap for escaping smoke.
Illuminate components and hoses with a strong flood light, the smoke will be more visible.
An ultrasonic sensor tester or commercially available leak spray can also be used to locate leaks.
Depending on how long fault finding lasts, the smoke generator button may need to be pressed again. This ensures there is enough smoke present in the fuel system.
The installation opening inside the passenger compartment must be opened to check the flange on the fuel pump and fuel filter.
-- Replace any leaking hoses or components.
After completing the work, perform the "Check tank ventilation system for leaks" guided function with the Vehicle Diagnostic Tester.