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Fuel pump lines


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89 Chev 1/2 ton 4x4.

I just put a fuel pump in it and now I'm curious. This truck isn't in the greatest of shape so instead of dropping the tank I cheated and cut a hole in the bed. Installed a new pump and wiring harness.

Just to make sure before I hooked up any fuel lines I turned on the key and, thank God, fuel pumped out of the larger of the 3 lines. I'm too lazy to trace everything out. My question is, I understand the larger (3/8) line must go up to the carb to feed fuel. What do the other 2 (1/4) lines do? I'm guessing one of them is a return, and if that's so, what does the remaining line do?

Just curioius.

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haha i lifted the box off when i did it on my 97. unfortunatly i had spent the previous weekend on the lake ice fishing, and it went out on monday morning. the underside of the box was caked with ice and snow and was at least 100lbs heavier becasue of it.

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