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OldRide Answers Home Using OldRide Answers Ask a Question   Browse Questions In: AMC Buick Cadillac Chevrolet Chrysler Dodge Ford Lincoln Mercury Oldsmobile Packard Plymouth Pontiac Studebaker Volkswagen Other Makes Classic Trucks  General Topics General Questions Help Identify Classic Car News General Restoration Vehicle Maintenance Site Suggestions & Comments            Search Questions:    kcroper      57 chevy sb 400 with dual exhaust. Is it necessary to run the fuel line outside the frame? What is the best path for the line if on the outside of the frame? posted: December 5, 2008       Answers (2)   nomadsrule      It started life inside the frame,and for the most part that is where I run all of mine on coversions,less chance on it getting damaged, If you are running a 400, that is going to require more fuel .I would suggest getting a 3/8 " sending unit assembly for the gas tank & run 3/8 " line all the way to the carb. 5/16 line will cause a fuel starvation issue under hard acceleration. posted:  December 6, 2008   pontiacsd      If you are going to run a fuel line on the outside of the frame rail just make sure it is secure enough with clips and clamps. Most all my Pontiac's have the fuel line run on the outside of the frame and I have yet to hear of any issues ever arising from this type of setup! posted:  December 8, 2008

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