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Discussion Starter #1
I have since installed a carburated 383 with an inline fuel filter- getting rid of the factory AC one with the nipple for the fuel return line back to the tank. So with that gone, what do I attach to that return line? I have a fuel regulator that I have heard guys will use one port to return. I'd certainly rather use the line than plug it off, so any advice is appreciated.
 

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If recall, this 1/4" nipple line off the filter was run back to the bottom of the fuel pump can. Or do you actually have a line going back to the tank? If so, use it, if not , going back to the return line is the same thing. Right?
 

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Discussion Starter #4
Its an actual line going back to the tank. It parallels the 3/8 fuel line. I am trying to figure out how to utilize it. Since the fuel filter is gone, where/what would I hook into it?
 

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Its an actual line going back to the tank. It parallels the 3/8 fuel line. I am trying to figure out how to utilize it. Since the fuel filter is gone, where/what would I hook into it?
OK, I suspected it was a single line set up, I think this return line was put in place to help with the hot start issue as when engines are shut down, pressure remains in the carb or line, thus if you have leaking carb float needles, it dribbles down the carb and sits.
So if that's not a concern, plug it, but it would come in handy if you ran an after market EFI that did not have any means of keeping the fuel cool . I ran an EFI in one car and it had no return lines back to the tank, thus fuel was always hot . Running a return to the tank keep circulating the hot fuel but while maintaining a 55# psi on the injectors at all times.

My Z has only one fuel line and mechanical pump so , it works well with one line. Plug it at the filter and see what happens . At one time I thought these lines worked with a vapor canister but your line comes off the filter and goes back to the tank. I did not see a set up like that in the AIM manual.
Maybe someone will chime in on this.
 

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Discussion Starter #7
Doug- that is exactly the filter I took off. These are factory lines back to the tank, thus if I can use the return line, I will. Again, just not sure where I can plug into.
 

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This filter is common with A/C option because of the extra heat generated.
If mine, I would leave the line in place, and maybe, install a 0.030" orifice into the line and T it from the present supply line and just keep using the return line.
Certainly doesn't hurt leaving it.
 

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Marc, where was the filter located before you took it off. Here is a diagram of a fuel system. See what you would have to add to makeup a return system like in the attachment
 

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Discussion Starter #10
So, the filter was in the hard line from the fuel pump up to the carb. The (vapor return I guess its called) curved downward back to the line, back to the tank.
 

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So, the filter was in the hard line from the fuel pump up to the carb. The (vapor return I guess its called) curved downward back to the line, back to the tank.
Correct, steel hard lines heat up and fuel boils inside turning liquid into a vapor.

Thus the return line lets this vapor escape back to the tank to keep lower temp fuel, read liquid fuel, pumping.
 
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