Question about 1986 Ford F 250
You probably have a bad fuel pump in the front tank. There are other possibilities as well. I have replaced tank switches for this reason also. You need to check for power and ground at the front tank when the switch is in the front tank position and the ignition switch is turned on.
At the wiring connector that goes up to the tank, (on the frame rail next to the tank) the power wire is the RED wire and the ground wire is the ORANGE wire. (The other wires are for your fuel gauge.)
The fuel pump relay will supply voltage to the RED wire for only about 2 or 3 seconds (to prime the fuel rail) when the ignition switch is turned to the ON position, so you will need a helper to check this.
If there is no power, then you should suspect the switch. However, check for power at the switch to verify that it is the switch and not a broken wire between the switch and the tank connector.
If power and ground are both present at the tank connector, replace the front fuel pump.
Posted on May 25, 2012
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Posted on Jan 02, 2017
SOURCE: I have an 85 Ford
You should be able to hear the pump in the tank running. If you don't check the fuel pump relay. If you hear the pump running then the line/filter could be plugged. The white relay is the tank selector relay, the green relay is the fuel pump relay. If the green relay is bad you will have a bad time getting the replacement. The new relays from the dealer and parts stores are all 5 pin. The green relay is a 4 pin.
Also your genset probably has a pump that pulls from that tank on its own.
Posted on Aug 10, 2009
SOURCE: I have a 1990 Ford
Sound like your fuel tank selector valve is bad.it's located on the frame rail between the tanks and the filter.
Also, keep in mind that the rear in tank pump is bad. The dual function reservoir is mechanical. The pressure from the in tank pump switches the mechanical valves; the dual function reservoir serves two purposes:
1. Mechanical Selector valve for the tanks.
2. Holds extra fuel in the reservoir so if the gas tank is low on fuel and you go around a turn and the low pressure pump can't pump any fuel, the high pressure pump can still draw fuel from the reservoir.
Read this thread which explains how to test the in tank pumps: ford-trucks/88-5-0-no-start-fuel.
Keep us updated.
Posted on Feb 28, 2011
Sounds like the rear fuel pump in the tank is not working and the float or sender is bad also. check to see if the rear pump is working should make a humming noise.
Posted on Jan 29, 2009
85 ford 350 econoline van with 460 engine and duel tanks, lost prime on both tanks, cannot get gas up to inlet on carb, it happen after having shot work on vaccum lines, i can't hear the pumps in the tanks making a buzzing noise, i hear a click when i switch from front tank to the rear tank , somewhere under the hood, on the driver side front fender, what is the next step.
Posted on Oct 07, 2009
When you switch tanks can you see what the correct amount of gas is in the that forward tank? Can you verify that the fuel-pump inside the forward tank is coming on? A common problem for fords are the selector switch units. But you want to make sure you narrow it down enough so you don't buy the wrong part. Let me know how it is going.
Posted on May 19, 2010
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