Residual Pressure

WORK SEQUENCE
- open valve on VW 1318 pressure gauge
- turn ON US 4480/3 for 30 seconds, then turn OFF
- minimum pressure after 10 minutes must be 2.6 bar (38 psi)

If pressure NOT OK
- inspect fuel pump check valve and all connections for leaks

If NO leaks
- check sensor plate clearance

If clearance OK
- replace diaphragm pressure regulator
- repeat system leak test

If pressure still NOT OK
- replace fuel distributor O-rings

NOTE: Residual pressure check does not include cold start valve.