3.0, 4.0 OHV, 4.0 SOHC Fuel Pressure. - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 02-12-2008
redranger4.0's Avatar
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3.0, 4.0 OHV, 4.0 SOHC Fuel Pressure.

All these threads about fuel cells have been poping up. Ive been getting contrasting info about which engine uses what for fuel pressure.

TRS lists the 3.0 to need 30-40psi.
3.0 specs

TRS also lists the 4.0 OHV to be 30-40psi, while the SOHC is listed 64-75psi.
4.0 OHV and SOHC specs

So who wants to join in and clear this up if these numbers are correct or not.
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Old 02-12-2008
04 EDGE
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my 04 spec is something like 55-65 PSI

i'll go find my alldata dvd and give you the true specs
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Old 02-12-2008
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The 30-40 psi specs are for Fords that use a conventional "return" fuel system.

1998+ Rangers use a mechanical "returnless" fuel system regardless of the engine. Mechanical returnless fuel systems have the following characteristics:

(1) there is no return line running back to the fuel tank from the fuel rail;

(2) the fuel pressure regulator is now in the fuel tank with the pump, not on the fuel rail;

(3) theyare designed to operate at higher fuel pressure (64 +/-8psi for gasoline engines, 55psi +/-8 ps for FFV);
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Old 02-20-2008
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the 4.0L SOHC engine has a pressure regulator on the drivers side fuel rail on the very back. i found it on mine in class
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Old 02-20-2008
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Quote:
Originally Posted by levelIIrdneck View Post
the 4.0L SOHC engine has a pressure regulator on the drivers side fuel rail on the very back. i found it on mine in class
What you are describing is the fuel pulse damper, which the Ford Manual describes as follows:
Quote:
Located on the fuel rail is a pulse damper. The pulse damper reduces fuel system noise caused by the pulsing of the fuel injectors. The vacuum port located on the damper is connected to manifold vacuum to avoid fuel spillage in the event the pulse damper diaphragm were to rupture (the pulse damper should not be confused with a fuel pressure regulator).
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