Hey James. The metal fuel line right next to the tank is the main feed line. The metal line on the outside is the return line. I've attached a picture of the pump to show which is which. The wider fitting is the supply line and the narrower fitting is the return line.

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I have since found a better way to attach the rubber fuel hoses. These allow for a better connection and you can use the same size hose. DMCH uses the same type of fittings.