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i used a $25 painless wiring relay kit from summit racing for my Efan and and i hooked it up to the fuel pump fuse. it works perfectly and doesnt' allow current to flow back into the circuit when i shut the car off. without a relay you'll turn the car off, the fan will still spin, and it could feed back enough current to keep the car alive for a few seconds then sputter, backfire, and die.
not so good for impressing the ladies.
relays are king.
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