Fuel Pressure (Golf & JETTA)

Install Fuel Pressure Gauge (VW 1318) and Adaptor (VW 3118-5) between the fuel distributor test port and cold start valve. Ensure control lever is in the closed position. See Fig 1 . Bleed excess air from system cycling control valve with gauge upside down.
Remove fuel pump relay and attach Remote Switch (4480/3). Open fuel pressure gauge control lever and activate fuel pump using remote switch. Fuel pressure should be 75-82 psi (5.2-5.6 bar). If fuel pressure is low, perform fuel volume check. If fuel volume is okay, replace fuel pressure regulator.

Fig 1: Fuel Pump Testing Arrangement (Except Vanagon)
Courtesy of VOLKSWAGEN UNITED STATES, INC.
If fuel pressure is above specification, remove return hose from pressure regulator and repeat test. Fuel pressure should 75-82 psi (5.2-5.6 bar). If okay, check for restricted fuel return line. If pressure is incorrect, replace fuel pressure regulator.