as of now im using a internal fuel pump out side of the tank im looking to to get a external fuel and don't know what to get i was looking at a external fuel pump that can pump 255 L\HR @ 40psi is 40psi enough????? what specs should i look fore in a external fule pump ? also i was thinking whould the fuel sending unit from 84\87 gn fit in a non fuel injected regal tank? does any one know the size of the o ring that goes between the tank and sending unit on 84/87 gn????