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Re: '71 with an LBZ duramax. Need advice on fuel tank.
I had a 1986 nissan p/u pre-runner. It had the stock tank 60L and a 80L tank in the bed that would drain into the stock tank below. It had a 3/8" fill line and 3/8" vent. You could use the stock tank like normal non vented cap. Then fill the 80L tank with a vented cap. I would sometimes fill through the upper tank, empty stock tank. By the time I filled the 80L and drove away there was about 40L left in the upper tank. So it did fill the bottom tank at a half descent rate. Good luck
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