Any time the fuel system is opened for maintenance, the fuel system pressure
must be relieved first. On fuel injected engines, there is pressure in the fuel
lines even when the engine is not running.
- Start the engine.
- While the engine is running, disconnect the fuel pump or circuit opening
relay connector(s).
- Allow the engine to run until it stalls.
- Reconnect the fuel pump or circuit opening relay connector(s).
- Proceed with the fuel system repair or service. Whenever a connection is
loosened, use rags to prevent fuel leakage. If a line or connection is to
be left open for an extended period of time, plug or cover it.
