Tank Leak Diagnosis, Performing, Vehicles Through My 2012
Diagnostic leak test occurs in "Guided Fault Finding" see Vehicle Diagnostic Tester.
Checking the Fuel Tank System and Tank Ventilation System for Leaks
The following describes individual areas in the fuel supply and ventilation systems where leaks are possible. After repairing a possible leak, perform a leak test to ensure that leak was successfully repaired.
-- Switch off the ignition.
-- Make sure the fuel tank cap -arrow- was closed completely during the test.
-- Check whether seal of fuel filler cap was damaged or crimped. Replace if necessary.
-- Remove the rear bench seat, refer to REAR SEAT, REMOVING AND INSTALLING .
-- Remove the locking flange cover -1- -arrows-.
Observe installation notes for locking flanges, refer to FUEL DELIVERY UNIT/FUEL LEVEL SENSOR, REMOVING AND INSTALLING .
-- Check sealing rings seals under locking flanges are OK and lock rings are properly tightened on fuel tank. Also check the fuel line connections.
-- Visually check all wires and hose connections of fuel supply system and replace leaking lines, for example:
- Line from Evaporative Emission (EVAP) canister to EVAP Canister Purge Regulator Valve 1 -N80-
- Lines from EVAP canister to Leak Detection Pump -V144-.
- Line from fuel tank to EVAP canister (below heat shield for EVAP canister).
- Lines for tank ventilation (beneath right rear wheel housing liner).
- Fuel lines to engine.
Leaks at lines and components of tank system can sometimes be located using a nonflammable, environmentally compliant leak detection spray. For this, initiate leak diagnostic several times in sequence to build up pressure in the system. At leaking areas, bubbles will form.
-- Perform a visual inspection on the fuel system components and tank ventilation system:
- Fuel Tank
- EVAP Canister
- Leak Detection Pump -V144-
- EVAP Canister Purge Regulator Valve 1 -N80-
Due to the form or function of the components, leaking areas may not always be localized by spraying on leak detection spray. In this case, clamp off the relevant component using Hose Clamps - Up To 25mm3094 and initiate tank leak detection diagnostic. If the leak is no longer indicated, the component that was clamped off is defective. If clamped off directly at the leak detection pump and a leak is still indicated, the leak detection pump itself is leaking.