Packard Forum Index » Pre-War (1899-1942)

What was the original size of line running from tank to fuel pump

5/16

I used EziBend tubing (a copper nickle material) when I replaced the fuel line on my '32. It was easy to work with, doesn't work harden nor does it rust. Not cheap, but I would use it again instead of doing it in steel (preferred over copper because of safety reasons).

Another brand, same concept.

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Thanks for all the replies I am now ready to start

One more question would using 3/8 line hurt anything if I have plenty of that

Don't think it would hurt anything but you would need to obtain any necessary fittings to connect 3/8 tubing to the factory 5/16 fitting at the tank plus whatever is needed to connect to the flex hose at the fuel pump.

Can't speak directly to 37 but later cars have a brass block fitting bolted to the frame or sheetmetal that the flex hose connects to. The 5/16 tubing is soldered or brazed to that block so if you have one, reusing it might be an issue with larger tubing.

One more question would using 3/8 line hurt anything if I have plenty of that

1930s Eights have 5/16 lines
1930s Twelve have 3/8 lines

Often wondered if the 3/8 line was one of the culprits to the Twelve being more prone to Vapor Lock. Line Fittings IDs are the same, Fuel Pump designs are identical on the fuel side and Carb orifices are almost identical. Thinking larger line would leave more stagnant fuel which might add to Vapor's being created. JUST A THOUGHT.

Thanks Howard I went and got 5/16 line Moving right along

Yes I got to thinking the larger line may cause issues for mechanical pump suction