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Differential Pressure Regulator Fuel Pressure

Connect Pressure Gauge (VW 1318) as described previously 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. If pressure is not as specified, replace differential pressure regulator.