notenuftime
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He has said that it will do this on both tanks, but it will do it worse on the front tank. He also said that both tanks are over 3/4 full so the shower heads are probably not the issue. When they fall off, you'll run out of fuel at about 1/4 tank. Since you can gear the FSV working and both thanks are almost full, I tend to lean toward the FSV also not being the issue unless there's a way that it can pull outside air into the system which should show up as at least dampness on or around the FSV (I think). Do you know why the truck was parked for so long? Was it having these issues back before it was parked? I believe that some have said on here that the bowl on the bottom of their Facett wasn't tight enough. If it's not completely tight, and there is some type of build up on the shower heads in the tanks, then the pump could be straining enough to pull air in through a not-quite-completely-sealed seal. Maybe the front tank pick up is more plugged than the rear one and that's why the problem's worse on the front tank?
Half the FSV is always operating under negative pressure so it won't always weep when sucking air. I have never seen an FSV itself actually leak, its generally the oring quick fittings on the in and our ports.
Working on the FSV is messy. You will be covered in diesel when its done, but if you are planning to drop the tanks you have already resigned yourself to get messy.
Why don't you disconnect the valve. You can then test it by blowing air through it to check for clear flow in both positions, you can also put air back into the tanks to blow any obstructions in the pickups out, and then replace all the FSV orings and put it back together?
If you hear the FSV click, then you know the motor works. that leaves you with debris keeping it from moving fully from one position to the other. Failed showerhead chunks can get into the fsv and cause flow problems, but usually a little air pressure from the other side can blow them out.
It sounds like you are chasing the problem that parked it years ago, so at least its consistent.
The other thing that no one has mentioned is clogged tank vent. You can test this by pulling the fuel caps off and driving it, but I have never seen one die within a couple miles of starting with clogged vents, that usually takes several miles of highway driving to show up.
Just to add here. You want to make sure that there's two sizes in this pack and it's not just a pack of one size. I don't know if they're sold in packs of just one size, but I wanted to point that out.You will probably break a holding clip or two getting them off so pick up a pack of them. Dorman sells a bubble pack of them at most parts stores.