First disconnect the pump, if fuse still blows then it's wiring, maybe relay, if not then it is the pump. Another possibility would be blocked fuel filter, lines or fuel pressure regulator making fuel pressure too high and causing pump to work extra hard which blows fuse.
What value fuse have you got, I think it's meant to be 30A, maybe somebody replaced it with lower value in the past.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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