Question about 1996 Ford Explorer
The fuel pressure with key on is : 35 - 45psi
Fuel pressure with engine running : 30 - 40psi
Hope this helps.
Posted on Oct 14, 2010
General Information NOTE: The pressure regulator reduces fuel pressure to 39-40 psi under normal operating conditions. At idle or high manifold vacuum condition, fuel pressure is further reduced to approximately 30 psi. The fuel pressure regulator is a diaphragm-operated relief valve, in which the inside of the diaphragm senses fuel pressure and the other side senses manifold vacuum. Normal fuel pressure is established by a spring preload applied to the diaphragm. Control of the fuel system is maintained through the Powertrain Control Module (PCM), although electrical power is routed through the fuel pump relay and an inertia switch. The fuel pump relay is normally located in the power distribution box, under the hood, and the inertia switch is located on the toe-board, to the right of the transmission hump, in the passenger-side footwell. The inline fuel pump is usually mounted in the fuel tank. Tank-mounted pumps can be either high- or low-pressure, depending on the model. The inertia switch opens the power circuit to the fuel pump in the event of a collision. Once tripped, the switch must be reset manually by pushing the reset button on the assembly. NOTE: Check that the inertia switch is reset before diagnosing power supply problems to the fuel pump. The fuel injectors used with SFI system are electro-mechanical (solenoid) type, designed to meter and atomize fuel delivered to the intake ports of the engine. The injectors are mounted in the lower intake manifold and positioned so that their spray nozzles direct the fuel charge in front of the intake valves. The injector body consists of a solenoid-actuated pintle and needle-valve assembly. The control unit sends an electrical impulse that activates the solenoid, causing the pintle to move inward off the seat and allow the fuel to flow. The amount of fuel delivered is controlled by the length of time the injector is energized (pulse width), since the fuel flow orifice is fixed and the fuel pressure drop across the injector tip is constant. Correct atomization is achieved by contouring the pintle at the point where the fuel enters the pintle chamber. NOTE: Exercise care when handling fuel injectors during service. Be careful not to lose the pintle cap and always replace O-rings to assure a tight seal. Never apply direct battery voltage to test a fuel injector. The injectors receive high-pressure fuel from the fuel supply manifold (fuel rail) assembly. The complete assembly includes a single, pre-formed tube with four, six or eight connectors, the mounting flange for the pressure regulator, mounting attachments to locate the manifold and provide the fuel injector retainers and a Schrader® quick-disconnect fitting used to perform fuel pressure tests. The fuel manifold is normally removed with the fuel injectors and pressure regulator attached. Fuel injector electrical connectors are plastic and have locking tabs that must be released when disconnecting the wiring harness.
Posted on Oct 14, 2010
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Posted on Jan 02, 2017
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