I had not intended to post anything about this since it pertains to Ford trucks.
But there seems to be some closet Ford owners here, so I figured I would see if anyone needed the info.
I've got a 1989 F250 351ci Gas with multiport Fi with dual tanks.
Earlier Fords, and diesels of that vintage used a solenoid operated valve to switch between tanks.
But, for gas engines from about 1987 to around 1990, they had a better idea.
There is a pressure operated valve mounted on the frame just behind the drivers door.
4 inputs, 2 outputs plus a small reservoir.
To switch tanks, a dash switch turns off one in-tank pump and turns on the other.
When the pressure from one drops and the other one builds up, it moves valves in the unit which switch both the input and the return line.
This feeds the high pressure pump that supplies the injectors.
My truck has not been able to run off the front tank for a while now. I changed the pump in the tank, and it will run off it for a few minutes then start sputtering.
That valve seems to have two failure modes.
It either does not switch at all, or switches and then stops feeding.
That is my problem.
A worse version, is when the feed switches but the return line does not. This causes the fuel to feed out of one tank but the excess to return to the other.
If the other tank is full, it starts to overflow! That will get your attention.
The local Ford dealer and parts houses say that it is no longer available.
I did some research, and have found that they are still being made. I was going to order one from the actual maker, but found that some Ford dealers can still get them under a different part name and number.
If anyone needs it, here is the info.
Here is where I bought it, with a picture.
http://www.amazon.com/gp/product/B0042HFX68/ref=oh_details_o00_s00_i00
The Ford part number is F1UZ9B263B.
BTW, the overflowing tank syndrome will occur with newer trucks too, but its a bad check valve in the tank instead of this valve.
I'm glad to find this one, because I was going to have to adapt to the solenoid style if not.
The wiring would not be hard, but the plastic lines and fittings would be a pain since the other valves do not use the same fittings.
But there seems to be some closet Ford owners here, so I figured I would see if anyone needed the info.
I've got a 1989 F250 351ci Gas with multiport Fi with dual tanks.
Earlier Fords, and diesels of that vintage used a solenoid operated valve to switch between tanks.
But, for gas engines from about 1987 to around 1990, they had a better idea.
There is a pressure operated valve mounted on the frame just behind the drivers door.
4 inputs, 2 outputs plus a small reservoir.
To switch tanks, a dash switch turns off one in-tank pump and turns on the other.
When the pressure from one drops and the other one builds up, it moves valves in the unit which switch both the input and the return line.
This feeds the high pressure pump that supplies the injectors.
My truck has not been able to run off the front tank for a while now. I changed the pump in the tank, and it will run off it for a few minutes then start sputtering.
That valve seems to have two failure modes.
It either does not switch at all, or switches and then stops feeding.
That is my problem.
A worse version, is when the feed switches but the return line does not. This causes the fuel to feed out of one tank but the excess to return to the other.
If the other tank is full, it starts to overflow! That will get your attention.
The local Ford dealer and parts houses say that it is no longer available.
I did some research, and have found that they are still being made. I was going to order one from the actual maker, but found that some Ford dealers can still get them under a different part name and number.
If anyone needs it, here is the info.
Here is where I bought it, with a picture.
http://www.amazon.com/gp/product/B0042HFX68/ref=oh_details_o00_s00_i00
The Ford part number is F1UZ9B263B.
BTW, the overflowing tank syndrome will occur with newer trucks too, but its a bad check valve in the tank instead of this valve.
I'm glad to find this one, because I was going to have to adapt to the solenoid style if not.
The wiring would not be hard, but the plastic lines and fittings would be a pain since the other valves do not use the same fittings.
