The fuel pump relay "2" is located on the relay holder in the luggage compartment on the right behind the trim above the battery. Its task is to supply the fuel pump with current. By disconnecting the battery, the relay interrupts the current supply to the pump when the crankshaft speed pulses are no longer received with the ignition on (the engine stalled).
When it is necessary to turn on the fuel pump to check the injection system without starting the engine, it is necessary to remove the relay and connect terminal 30 to terminal B7b with a 1.5 mm diameter jumper (in a diesel engine terminal B7).
Caution: To test the fuel pump relay, the battery must be charged.
Check the injection system fuse. The location of the fuses is indicated on the fuse box cover.
Remove the fuel pump relay.
Connect terminal 30 with terminal B7b using a jumper (in a diesel engine terminal B7). Make sure that the relay's sensitive contacts are not damaged. If the pump works, replace the fuel pump relay. If the pump does not work, check the supply wires to the relay and the fuel pump, replace the damaged wire.
Checking the relay / fuel pump is set out here.