Testing pressure relief valve in filler cap

Screw filler cap onto tester with adapter V.A.G 1274/9.

Fig 1: Checking Pressure Relief Valve In Filler Cap

GW00008266

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Attach hand pump and build up pressure.
The pressure relief valve should open at a pressure of 1.4 - 1.6 bar.