mechanical fuel pump question

[superwade57]

I've got a carved 86. It has functional dual tanks and a quadraje 825 cfm? Its the big one. Anyway I keep burning up today's junk fuel pumps they sit over winter and done-zo I can hear my tanks switch and I have at least 5 gals of fuel in tank. But no fuel delivery. My question is on the three orafice pumps am I correct in saying one line in for inlet one for return and one for the feed to Carb. Do I need the return line? If that's what it is. I ask because I have a nice Carter pump on the shelf but its only two orafice. Can I use it?
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