fuel pressure
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
fuel pressure
Welcome to FTE!
The actual pressure used by the truck depends on the engine- The 300-6 used a little higher of pressure than the v-8's did. The in-tank pumps only make between 5 and 7 psi, so I wouldn't trust the valve with too much more than that. The system pressure at the rail is generally between 35 and 55psi.
The actual pressure used by the truck depends on the engine- The 300-6 used a little higher of pressure than the v-8's did. The in-tank pumps only make between 5 and 7 psi, so I wouldn't trust the valve with too much more than that. The system pressure at the rail is generally between 35 and 55psi.
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New User
Joined: Aug 2003
Posts: 6
Likes: 0
fuel pressure
thanks for the info, does anyone know of a fuel switching valve that can handle 50 psi. I just built a 390 efi for my 76 f150 that is running about 45psi at the rail at full throttle. I would really like to keep both tanks working the way ford designed it to work.
Senior User
Joined: Jun 2003
Posts: 114
Likes: 2
From: Harlan, KY
fuel pressure
My 89 F-150 has a high pressure pump mounted on the frame that recieves fuel after it passes through the tank selector valve. I have measured running pressure of 58 psi at the fuel rail and one manual cites 50 to 60 psi as normal for the I-6 (less for other engines). At some point Ford stopped puting a high pressure pump on the frame. If Your truck does not have the high pressure pump, then it seems that the in tank pumps must pressurize the fuel and the switch valves probably can handle the pressure.
