[ford38v8]

Not to dispute cas3’s advice, but I don’t believe the difference to be important enough to change out the pump. Rather, you can easily change out the sender, that job being merely a one beer task. The even better news is that you can kick back with your beer and watch someone change it for you job complete in exchange for the 50 lb sender. On the other hand, your rebuilder should take responsibility for his not being alert to the non compatibility of pump and sender. I would go the first route however, and have a cold one with a new friend!