1988 F-150 inline 6 cyl. 4wd. tank selector switch was used now won't start

In my old 1989 dual tank truck, the tank selector valve is operated by
the fuel pressure of the low pressure in-tank fuel pump; the switch only
selects which fuel pump runs, the front or rear.   Perhaps the valve is
stuck.  You can try to bypass the selector valve if you haven't already
and connect the lines from the front tank directly to the selector valve
outputs.


On Mon, 20 Feb 2012 10:46:42 +0000, mottvillemama wrote:

Flip the switch back.

When I went to one tank with my '89, Ford had a special kit to nullify
the dual purpose reservoir (which is a flip/flop valve, driven, as
someone said, by whichever tank pump is switched on - both tanks have
a low pressure pump and, after the DPR, with my v8, there is a high
pressure pump which delivers to the fuel rail).

That should have been 'Dual Function Reservoir',

On Mon, 20 Feb 2012 10:46:42 +0000, mottvillemama


Sounds like the switch is bad, or the switching device under the truck.
More likely the thing under the truck due to corrosion, or a corroded
wire under there.  Since you only have one tank, just wire direct to the
working tank.  You can either remove the dash switch, or just run both
wires to the working tank.  Eliminate the switching device completely.
You dont need it, unless you plan to add a second tank in the future.