Econoline E350 1 Ton V8-5.4L CNG VIN M (1999)
Fuel Shut-off Solenoid: Description and Operation
The fuel shut off valve solenoid seals the upstream fuel pressure from entering the fuel injection supply manifold when the engine is not running. The
fuel shut off valve solenoid is open only when it is activated by the solenoid valve (fuel pump) relay.