I disconnected the positive terminal from the pump and wired it direct to the positive battery and the pump kicked on. then reconnected the wire to the pump and put in a 25A fuse and now it runs and doesn't blow the fuse. i checked some of the visible wire and see no cut/chafing. can a pump on the brink cause fuses to blow? should i change the pump even though it's huming quiet and fine and the fuse is holding. Don't have an ameter that goes to 25A but should I borrow/buy one and test the pump draw? What should it be, its listed as a Piersburg E3L in my shop manual? Any suggestions regarding tests or likely fail scenarios?

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1972 450SL
1982 300D Turbo