Fuel Cap, Testing

-- Connect fuel cap tester to hose.

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

Fig 1: Screw Fuel Cap Tightly To Cap Receiver

Courtesy of AUDI OF AMERICA, LLC

-- 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.