Fuel Pressure

Checking the Fuel Pressure:
Battery voltage at least 12.5 V.
Fuel filter OK.
Fuel tank minimum 1/4 full.
Fuel Pump (FP) control module (J538) OK.
The ignition is off.

With the V.A.G. 1318 and adapters connected:
Connect the vehicle diagnostic tester.
Select "engine electronics" in On Board Diagnostic (OBD).
Select "output diagnostic test mode".
Select "fuel pump electronics" and press "start".
Close the shut-off valve on the pressure gauge as soon as fuel starts to come out of the auxiliary hose.





Lever stands perpendicular to direction of flow - arrow -.
Read the fuel pressure on the (V.A.G 1318).
Specified value 5 to 8 bar

Holding Pressure:
Check for leaks and constant pressure. Watch the (V.A.G 1318) for a drop in pressure while doing this.
After 10 minutes there must be a residual pressure of at least 3.0 bar.

Fuel Pump Delivery Rate:
Minimum delivery rate 800 cm3/15 s