Volkswagen Passat 1995 Official Factory Repair Manual page 2135

Engine components,checking
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- Start engine and let run at idle.
- Measure fuel pressure.
Specified value: approx. 2.5 bar positive
pressure
- Disconnect vacuum hose from fuel pressure
regulator on upper section of intake manifold
(arrow). Fuel pressure should rise to:
approx. 3 bar positive pressure
- Switch ignition off.
Note:
If fuel should escape at the vacuum connection of the
pressure regulator, replace fuel pressure regulator
Page 24-13 , item 14 .
- Now check for proper seal and residual pressure.
Observe pressure drop on pressure gauge for this.
After 10 minutes:
at least 2.0 bar positive pressure should still be
present.
If residual pressure falls below 2 bar positive
pressure:
- Start engine and let run at idle.
- Wait until pressure has built-up, and then switch
off ignition. Simultaneously clamp return line (with
blue marking) on fuel rail completely closed.
- Observe pressure drop on pressure gauge.
Page 54 of 59
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12/6/2004