Well what happens is when the fuel pump burns out on some cars (fairly common. An independent shop probably does 1-3/wk) the entire module gets replaced. So go ask at your local mechanic if you can have their dead fuel pump modules (they are worthless to the mechanic).
The complete module looks something like this:
You the remove everything but the bucket, and venturi (aka jet) pump. And you have something like this
Ignore the valve. It doesn't matter.
You then install your walbro (or stock replacement pump) by putting it into the black sleeve, sticking a filter sock on the bottom, and connecting the black hose to the venturi nipple on the fuel pump (heat the end of the hose before stuffing it on. Just remember heat+gas fumes=bad).
Ok, so now you have your own custom fuel module. Build a bracket to weld to the bottom of the bolt on filler plate (make it fairly sturdy. Fuel can hit it pretty hard when sloshing). Strap or bolt the module to this bracket. Your RCI should have a pick-up tube on the "Fuel out" nipple. Cut part of this tube off, flare a bump on the end, and stuff a hose over it and secure with a hose clamp. Only problem is the pick-up tube is larger than the fuel pump outlet on the walbro. I had to stretch the **** out of the hose to get it over but I think it will be fine.
The only other thing to worry about is the return has to dump into the bucket. The jet pump can't keep up if the main pump is taking what is in the bucket and dumping it into the cell. So either make a bracket to hold the bucket under the return nipple, or make some sort of tube to direct the returned fuel into the bucket.
The jet pump does work, I've tested it. It will pull fuel from less than 1/4" and keep the bucket overflowing with nice cool gas (and your pump/engine happy).
Hope this helps.
Cory