Vehicles With 8-Cylinder Engine (Open Loop System)

Fuel Pump Delivery Volume, Checking -vehicles With 8-cylinder Engine (Open Loop System)

Test requirements







- VAG1348/3A with VAG1348/3-2
- Container (fuel resistant)

Test requirements
- Battery fully charged (at least 12 volts)
- Fuel tank filled at least 1/4 full min.
- Fuel filter OK
- Ignition switched off

Test sequence

WARNING:
- Fire Hazard. Do not smoke, work near heaters or have anything in the area that could ignite the fuel or fumes.
- Fuel supply lines are under pressure. Before loosening any lines, cover the connection with a rag. Release the pressure by slowly separating the connection.

- Open cover for fuse panel on driver's side under instrument panel.
- Remove fuse 28 from relay panel (left-row, fifth large fuse from top).







- Connect VAG1348/3A remote switch with VAG1348/32 adapter cable to cavity for fuse 28 (arrow).
- Connect test probe to Battery Positive Voltage (B+).
- Remove fuel filler cap.







- Remove fuel return hose from line adapter
- Attach auxiliary hose to the distribution pipe and insert into container
- Operate remote maintenance for 15 seconds with the button depressed.







- Compare amount of fuel with the desired value.
*) Minimum delivery cubic centimeter/15 seconds
**) Voltage at fuel pump with engine stationary and pump running (approx. 2 volts less than battery voltage).

- Install the fuel return pipe with new hose clip.