Carb Expert Advice on 74 FJ40

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Joined
Jan 25, 2017
Threads
61
Messages
166
Location
Grand Rapids, MI
I have a 74 and it has the original carb. Timing is set perfectly, truck idles nice but we were having an issue where it would die every time we come to a stop. My mechanic decided to block/shut off the return fuel line out of the carb by pinching the line with a pair of vicegrips. The return line goes into the frame on the passenger side. The truck came with an extra new Aisin Carb, and when we looked at it, it did not have a return line, so he decided to do the same for the Carb that is on the truck. So far it has not died and seems to be running much better.
Also and maybe unrelated, when looking at the firewall by the passenger side, there are 2 metal lines sticking out (See pics), does anyone know where they go?
Any help or diagrams are appreciated. We are not going to completely remove the return fuel line until we are 100% sure that it is the cause of the truck dying.
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I think the lines your pointing at are for the charcoal canister. Im pretty sure the 2 lines I circled are fuel supply and return.
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