Thread: BBC fuel pump question

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Hey guys,
Why does the fuel pump I have on my '84 454 have three connections? The motor originally had a quadrajet on it. I am assuming the large one is "in from tank", the square threaded one is "out to carb", the third smaller is a "return to tank" maybe...I dunno??? I always thought only fuel injection had a return.

I am dropping this engine into an older car with only one gas line. I plan to replace this pump anyway, not run a return or whatever that third one is. Will be using an Edelbrock carb.

here is a picture:

Right, it's a bypass to the tank. It is supposed to keep the pump moving some gas, reducing the chances of vapour lock. Sometimes it works.