Arcturus;
May I remind you that you may forgotten the first rule of troubleshooting: Check the simple things first!
Tip for reassembly: The FuPu Spacer is brittle (I thought it was of Bakelite, but apparently Derek has better info on this), so tighten the FuPu Bolts evenly, and finally less than if you were tightening upon a stack of metal! I can't shed any light on what the rubber part might be for either...
There is no strainer in the Tank that I am aware of, but a Pick-up Tube to the bottom of Tank.
Before using "some sort of pressure pump", I suggest you simply connect a short piece of hose onto the Tank line and blow the blockage back into the Tank (remove Tank Cap to allow this!)...often, such a blockage consists of many rust particles, so this may be enough...alternately, you could a little pressure from a can of carb cleaner snoozle into the hose...
One a cleared path has once again been established between Pump and Tank (and you know there is some sort of debris in the Tank), I suggest you plumb a fuel injection fuel filter (so large, with a large filter surface area) in, immediately at the Tank (this my require cutting the hardline to add it in), and have a second FuFi handy for quick changeover when Fufi is blocked (these can be back-flush to remove and allow inspection of debris, and can be reused or replaced)...this will allow you to capture the debris...eventually, you will prevail.
Good Luck!
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