Volkswagen Passat 1995 Official Factory Repair Manual page 2028

Fuel supply system components, removing and installing
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.FU08.20.1
Fuel Pump (FP) check-valve, checking
Test requirements
Remote control connected
Pressure gauge is still connected.
Test sequence
Note:
This test also checks the connections of the fuel
supply line from Fuel Pump (FP) unit to
connection point of pressure gauge for proper
seal.
- Close pressure gauge shut-off valve (lever
perpendicular to direction of flow).
- Operate remote control in short intervals until a
positive pressure of approx. 3.0 bar has built up.
- If excess pressure is built up, reduce pressure by
carefully opening shut-off valve.
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12/6/2004