The only way to find the correct sending units will be to pull the tank/tanks.....

Big difference between a fuel injected sending unit and a carbed sending unit...

.......Wookee

The in-tank pumps, if you have them, can't properly feed the engine and were never designed to do so. The in-tank pumps put out very low pressure and were designed to operate the switch over between the front and rear tanks. If you swapped the dash switch between front and rear it swapped in-tank pumps and the low pressure from that pump would push against the diaphragm in the change over valve which allowed that tank to feed though and closed off the other tank who's pump was not being powered. A main pump, either mechanical (carb engine) or electric (EFI) would take over after the change over valve and feed the engine.
Ford went to this system after having leaks, fires and recalls with the old solenoid system. The old system wiring would also get hot and fail which wouldn't allow either tank to work. Most of these problems were from corrosion and winter salt damage. Vans in good condition were usually unaffected.

Look under the van at the fuel lines and change over valve. If there is no manual handle for change over and there is no wired solenoid valve(s) then the tanks have to swap via pumps. Or just trace the wiring from the tank switch.

Ok so Ford did put both an intank pump along with a mechanical pump in there vans.
The sender units Cherry has, have the mounts on them for a fuel pump.
The numbers she used to locate the pumps came directly from a Ford dealer.
More of Fords better ideas........

......Wookee

I just don't know why Ford didn't just use one big 36 gallon tank like GM or Dodge. Seems this dual tank set-up really became a paint in the butt as the van got older.

With an actual full ladder type frame, , the Late Fords could hang the tank on the side.
No can do with a flimsy uni-body!!
I think my side tank, which is the main tank, holds about 19 gal and the rear tank, which is the optional tank, holds about 16 gal.

If the sending unit part number shows it fitting both single and dual tanks then it should have a few extra pieces (bits of hose, small clamp, etc.) with it for use with the single tank. The single tank vans, of course, had no in-tank pump.

Wookee's right, droppin' the tanks will tell the tale.

Actually Dodge did start "side-hanging" their tanks beginning in 98. They moved the spare tire down where the tank used to be. I just wonder if it had something to do with rear impacts, but I have never heard of a Dodge or GM van catching on fire during a rear end collision..ala Ford Pinto. LOL!

when I had a counter guy at advanced looking up parts via the puter.We had to go back to like 81 to finds a non pump mounted sender unit.
IF Ford put a low pressure pump in the tanks to assist the manual pump.This makes sence to me.
I pulled up this sender unit on a couple of the on line parts stores and the same unit kept coming up.

Chevy made a clean break from the manual fuel pump to the in tank electric one.
there in tank pump was also a high pressure pump wich requited all steel lines going up to the throttle body.

Cherry,your van did look nice setting at Astros place/cave...

........Wookee

replaced the EGR valve and found a universal fit hose that had the spring in it that fit.
emission light is still on, no idea how to reset it. (no computer)

drove it to town, 30 miles rounds trip, some highway.. temp was fine the whole time, need to take it out on a hotter day and get a little more highway time, but can't get it to overheat at all yet.