Fuel System Pressure Release

Fuel system pressure release procedure is not available from manufacturer. It may be possible to remove fuel pump relay, start engine, and run engine until fuel pressure drops (engine stalls).

On 3-series, fuel pump relay is located in fuse/relay block on left rear corner of engine compartment. See Figure and Figure .

On 525i and 525iT, fuel pump relay is located on right rear corner of engine compartment, next to DME control unit and DME master relay. First relay (viewed from top to bottom) is Digital Motor Electronics (DME) master relay, followed by fuel pump relay and then oxygen sensor heater relay.