Like Deezee and TT say, always fit a relay for a fuel pump. If you try to pull too much through a normal switch it will burn up at some point and leave you stranded. It's dead easy to do, instead of taking the pump feed wire direct to the pump take it to one side of the relay coil, the other side of the relay coil goes to earth. Then take a live feed to the common of the switch side of the relay (usually marked c)and another wire from the n/c terminal of the relay to the pump. When you turn on the pump switch the relay is energised which sends 12V to the pump.
PM me if you need more info.
Enoch (Dave)
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