V6 4.2L fuel pressure specifications

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Dec 4, 2019 | 03:52 PM

J_P

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Joined: Jun 2016

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From: SW WA

V6 4.2L fuel pressure specifications

I've been reading in the forums about fuel pressure specifications. It appears there are two types of fuel systems for this generation of vehicle. A single line system and a dual line system.

Quote:

Models with return fuel system 97-2004 @ idle
--Vacuum hose attached: 28-45psi
--Vacuum hose detached: 40-50psi

Models with returnless fuel system at idle
--2001 to 2004: 35-55psi

I've been looking for an official source of info to verify this but had no luck. My Chilton manual does not list this information.

Does anybody have a link to an official source of fuel specs ?

Dec 4, 2019 | 10:25 PM

projectSHO89

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From: St. Louis (Out in the woods)

All gasoline F150s of this generation are return-type.

Dec 4, 2019 | 11:35 PM

J_P

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Joined: Jun 2016

Posts: 139

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From: SW WA

I also found this :

Quote:

Alldata online - 2001 ford Truck F150 2wd v6-4.2L VIN2 System specifications

Engine Running - 28 to 45 psi
Key On Eng Off - 35 to 45 psi

Dec 4, 2019 | 11:48 PM

glc

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From: Joplin MO

Returnless started in 2004 with the new body style. Return type specs are 28 to 40, and will rise at least 5 with vacuum disconnected. This is not "official".