Fuel pressure regulator location

Hi,

Here is what I have related to the regulator. See attached info.

2003 Ford Truck Explorer 2WD V6-4.0L VIN E
Gasoline Fuel System
Vehicle Power-train Management Fuel Delivery and Air Induction Fuel Pressure Regulator Description and Operation Components Standard Models (Non BI-Fuel) Gasoline Fuel System
GASOLINE FUEL SYSTEM
FUEL PRESSURE REGULATOR

Fuel Pressure Regulator
see pic 1

The fuel pressure regulator (Figure 72) is attached to the fuel rail downstream of the fuel injectors. It regulates fuel pressure supplied to the fuel injectors. The regulator is a diaphragm-operated relief valve. One side of the diaphragm senses fuel pressure and the other side is connected to the intake manifold vacuum. Fuel pressure is established by a spring preload applied to the diaphragm. Balancing one side of the diaphragm with manifold vacuum maintains a constant fuel pressure drop across the fuel injectors. Fuel pressure is high when engine vacuum is low. Excess fuel is bypassed through the fuel pressure regulator and returned through the fuel return line to the fuel tank.

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Let me know if this helps.

Joe

You may need to look at the build date. The late 2003 trucks were some of the early fuel pump control module system vehicles where the pump pressure is controlled using the driver module and the PCM. Same system they used on 2004 and later.
What is the exact code you have, that may help if it's one common to the 2004 vehicles. A quick way to tell is to look at the fuel rail for the pressure sensor shown in the image. If that is what you have it uses the newer system.

Unless yours has the regulator that bolted to the intake like the earlier trucks like the one shown. Ford had a few versions of the 4.0 out there at the same time just to make it interesting.