Join Date: Feb 2011
Location: Bay Area
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It doesn't make any sense. The selector should still allow the fuel to go through whichever it is selected to. I say that because its obvious that there isn't power going to the solenoid when the truck is off just to keep the valve in position. And when I customized my fuel system, you'd be surprised how fast you will get soaked with diesel when you pull the supply hose off the steel line (after the selector). That was both with the valve electrical connector disconnected too.
You should trace from the tank forward to find out what the issue is. What I would do is:
Look at your selector. There are six lines that go to it. They connect using a Ford quick disconnect, which doesn't require a special tool. Grab some plieres or a flat tip screwdriver, or the wife's long nails, and pick off the supply line quick disconnect retaining clip. Then pull the quick connect off and oh, make sure you have a drip pan underneath with cardboard under that. It should constantly flow out. The quick disconnect that you want is, as I remember, above the return.
There are no fuel pumps in the fuel tanks, which is what I gathered from your post... Just check where I said, and then you'll know if the problem is before the selector or after the selector. I don't know why your fuse would keep blowing. The harness is easy to trace to look for perhaps a short.