Differential Pressure Regulator Fuel Pressure
Connect Pressure Gauge (VW 1318) as described above in SYSTEM PRESSURE. See Figure . Close pressure gauge valve. Disconnect differential pressure regulator harness connector. Fuel pressure should be 4.5-7.3 psi (.3-.5 kg/cm2 ) less than pressure noted in SYSTEM PRESSURE heading above. If not, replace differential pressure regulator.