I've got fuel line issues on my Holley 4160 dual feed. After cleaning the fuel line threads that screw into the carburetor inlets, they are now leaking (with them being tightened as much as I can without stripping the threads). They weren't leaking before I cleaned them with a chaser nut. I think applying Permatex High Temperature Sealant to them would stop the leaking (which is the same stuff I put on my exhaust manifold studs to seal them). I thought flared end metal fuel lines were not supposed to require a sealant applied to the threads? What I cleaned off with the chaser nut may have been some kind of sealant.
My other issues with the current fuel lines are 1) having to disconnect the main line running to the junction block, and move that line out of the way, to be able to remove the valve cover. 2) That same line is run so close to the valve cover it is almost making contact with it. 3) I have to completely remove the dual feed lines and junction block, to be able to access the fast idle adjustment screw with a 1/4" wrench.
My 383 has a Hemi style mechanical fuel pump with the Hemi Fuel Vapor Regulator/filter installed. Off hand I don't know the diameter of the Vapor Regulator fuel outlet barb. The outside diameter of the existing metal fuel lines running to the carb is .313" (5/16").
I'm leaning toward one of the two solutions shown, in this thread.
Post #7 (flexible braided lines, with the braided line run down to my Fuel Vapor Regulator/filter's fuel outlet)
Post#22 (Speed 21001 Stainless Steel Fuel Line Kit Holley 4150 Quick Fuel Black -6 AN). I would need to run hose or braided line from Fuel Vapor Regulator/filter to the line input.
I may try to PM the members that made post #7 and #22. Have to update the post yet again. I guess I was right the first time. I have a 4160 as explained to me by a speed shop employee. Therefore the line in post #22 won’t work for me. I ended up buying an Edelbrock flexible dual feed line made to use on either 4150 or 4160. So will try that..
Either of these lines would have to run between the dist cap and vaccuum advance diaphragm. But that is how the factory routed the line on a 440 Six Pack.
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