Walbro 225 hot wire kit?
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The factory wire going to the pump is small which creates resistance. That resistance will limit full power going to the pump. Hot wire kit runs a larger wire direct from the battery (fused) and to a relay that is activated by your old wire. If you want to save the money on the hot wire kit go to a parts store and buy a 30 amp relay for a fog light setup and wire that in, they are like $3.