Checking quantity delivered by fuel pump: Precondition:

Fuel filter and electrical supply in order.

1. Relieve pressure in fuel tank by opening tank cap.
2. Connect Porsche System Tester 2.
3. Raise vehicle.
4. Remove rear underside panel.
5. Disconnect fuel return line. Collect residual fuel.
   Fig 1: Disconnecting Fuel Return Line

   Courtesy of PORSCHE OF NORTH AMERICA, INC.
6. Hold fuel line in a measuring container. Actuate fuel pump with the Porsche System Tester 2 and allow fuel to flow for 30 seconds into a measuring container. Quantity supplied must be at least 850 cm3 /30 s, i.e. after 30 seconds at least 850 cm3 of fuel must be present in the measuring container.
   Fig 2: Holding Fuel Line In A Measuring Container

   Courtesy of PORSCHE OF NORTH AMERICA, INC.