Just an opinion and I might be wrong.....original filter was after the pump and had to be able to handle 2 bars of pressure. With many pumps relocated up front, it is possible to use a pre-pump filter, the caution is not to starve the pump if the filter chokes, heat and fire could result.
I have used a pre-pump filter with no issues, but I change it regularly. If the car sat 10 years, the tank is surely full of crud and the rubber lines have collapsed. be very careful. You can plug a filter very quickly.
As far as a test rig. My megasquirt has that functionality. car is not running now, but could be used to test injectors...
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