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On early cars the fuel pump power is normally from the non-fused side of the terminal block. The fuse actually protects the wire on the opposite side of that terminal. Porsche did not choose to fuse the fuel pump and a relay till later model years. The fuse blocks have straps on the back that connect fuses together, so adjoining terminals are sometimes connected. I don't have a good or complete diagram for your year, but it seems to show fuse position #12 for your car.
It should get power from the ignition switch terminal #15 which is power in run and start, not acc.
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Ed
1973.5 T
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