Fuel Cap (If Equipped), Testing

NOTE:

Beginning with MY 2016, some NVLD equipped vehicles come with a capless fuel fill system. This means that a removable fuel cap is not part of the vehicle fuel fill system.

Vehicles with Capless Fuel Fill System

If a leak is suspected at the capless fuel filler, employ the use of the smoke generator. Refer to METHOD 1: LOCATE LEAK WITH SMOKE GENERATOR .

Vehicles with Removable Fuel Cap

-- Connect fuel cap tester to hose.

-- Screw fuel cap tightly to cap receiver -arrow- .

Fig 1: Screw Fuel Cap Tightly To Cap Receiver

-- Turn control valve to "Test" .

-- Read flow meter on tester.

If no flow is indicated:

-- Proceed to Leak Detection Pump -V144- , TESTING FOR INTERNAL LEAKS .

If flow is indicated:

-- Replace fuel cap and re-test.

If new fuel cap shows no flow:

-- Repeat leak test, with new fuel cap installed, using Vehicle Diagnostic Tester in "Basic Settings" mode.

If Leak Test shows 'System OK":

-- Perform quality check and return vehicle to customer.