Fuel pp problems

We have a 1.2 sport+ and it died last October as the fuel pp fuse had blown, renewed it and all was ok for a day so the fuel pp was removed and an external 12v supply used to prove it was not turning. I fitted a scrap yard pp with 35k on it and all was ok till now. The car starts when you bounce it with ignition on but now stops on idle with no fuel seeming to be getting pp'd. Im loath just to fit another pp without doing anything else i should do?
 
did you change the fuel filter? and tbh this is a problem with fitting second hand parts, either fit a new one or get an new aftermarket one also check the wring around the tank
 
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