I got a 1972 a little over a month ago and this is my first car project. I knew very little going in so I just assumed everything was stock, but poking around this site and manuals the engine was swapped to a g180z and I have a mixture of parts not for my truck or missing:
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I just put a Weber on and found all the emissions stuff was pretty much gone/disconnected. My concern here is what to do with what I thought was the return line on the old hitachi carb and the fact my fuel ventilator system is disconnected.
I've been reading a lot of posts on the forum about people in this situation that cap the return line or have problems when the tank isn't vented. I don't have a check and relief valve. The oil pan hose just vents to the open air.
My question is does the 1972 have a return line? The hose that was used for a return line on my truck looks like is was for the fuel ventilation system and went to a check relief valve if I'm looking at the attached graphic correct:
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Since I don't have the check valve can I just put a filter on the fuel vent line and oil pan line and just let them vent to open air?
I also have an electric low pressure high output marine fuel Pump by Carter that came with the truck. This model is slighty higher PSI then required so I got a carter p4070 coming.
This is how I found my fuel tank connected. The read lines are how the hoses are attached to bypass the ventilation system. The two hoses running to the front of the truck are still intact but an electric fuel pump mount was welded near the tank for pump and the hose on the filler is just disconnected and hanging open to free air:
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