Leakage Test
WARNING: This page is about a different car, the 1983 Volkswagen Vanagon, 1983 Volkswagen Rabbit, 1983 Volkswagen Quantum, 1983 Volkswagen Pickup, and 1983 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
With nozzle connected to gauge, press pump lever down slowly and hold pressure at about 1595 psi (112 kg/cm2 ) for 15 seconds. No fuel should leak from nozzle tip.