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If the strainer fits, it will work. Remember, each fuel pump also has a strainer. Those are the first to clog and are much smaller.
NAPA sells the correct filter and two smaller gaskets (hard fiber for the bolt outside, rubber for inside) but the shell sealing ring won't work. A 4-1/2" OD...
I don't know how handy you are but you should be able to fix it. Unless it is badly corroded/broken. I've fixed the ammeter and fuel tank gauge on my 002a even though these are sealed. The frequency meter is beyond repair, all damaged by water.
If you do attempt, do it in an empty room and...
Yes, you are on the right track. Fuel pumps should flow through the injection pump and back to the tank. Take the cap off and listen. Be careful, a shorted coil in a pump could draw considerable current. Check wiring before to eliminate short circuits.