Fuel Pressure Solenoid
WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
High pressure which is present in the fuel rail flows to the ball seat of the solenoid. See Fig 1. This magnetic force equals a certain outlet cross section at the ball seat of the solenoid. The rail pressure is altered as a result of the quantity of fuel which flows off. See Fig 1. The current fuel pressure is signaled by the fuel pressure sensor to the engine control module (ECM). The controlled fuel flows back along the return fuel line, into the tank.
In a de-energized state, the fuel pressure solenoid is closed as the spring force presses the ball into the ball seat. See Fig 1. When engine is started, the fuel pressure solenoid is held closed by magnetic force. See Fig 1.
| 1 - BALL SEAT |
| 2 - SPRING FORCE |
| 3 - MAGNETIC FORCE |
| 4 - COIL |
| 5 - FUEL PRESSURE SOLENOID |
| 6 - HIGH PRESSURE FEED |