timsz Posted January 17, 2015 Share Posted January 17, 2015 Would this setup work for my fuel system? I have the pump and filter back at the gas tank also. Thank you very much. Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 18, 2015 Share Posted January 18, 2015 I would parallel the cooling bodies in all three carbs with the downstream line of the FPR before fuel cooler. It needs a separate path unrestricted by the FPR. If you have top end fuel starvation you can limit that flow with a needle valve on the outlet of the last carb ( always throttle temperature control on the outlet of the heat exchanger to prevent boiling ) If you have a high flow pump, those small cooling body returns won't bleed much. In the OEM setup in a 240Z using the mechanical fuel pump, the return line from the rail put ALL fuel through the cooling bodies downstream of the carbs, as the size of the fittings is equivalent in flow to the return line sizing on the 69-73 240Z's! Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 18, 2015 Share Posted January 18, 2015 (edited) The fuel cooler could be in the feed line coming up to the engine bay, and then one on each return. Return from the engine bay is hot, no matter what. I like to open loop the tank, and use the vapor line as it has far more flow capacity than the stock return. I also tended to use EFI pumps that flow like crazy so the two return circuits at 3.5 psi is not a big issue. Edited January 18, 2015 by Tony D Quote Link to comment Share on other sites More sharing options...
timsz Posted January 18, 2015 Author Share Posted January 18, 2015 There is only the 2 cooling ports on the 1 carb, like in the pic. The other 2 carbs don't have ports that I see. Thank you very much. Quote Link to comment Share on other sites More sharing options...
Tony D Posted January 19, 2015 Share Posted January 19, 2015 I wouldn't bother until you get them all three. The LAST thing you want is one carb with cool fuel and different density fueling two cylinders and hot gas in the other four! I'd put the fuel cooler on the return line (and the feed line for that matter.) If you have A/C, you can wrap the cool line in copper coil and then put insulation foam over it and use that to cool the feed or return---caveat being it's only functional when the A/C is running... Quote Link to comment Share on other sites More sharing options...
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