Fuel tank sending unit size?

[hellfirechrome]

Hey guys! I've got a '66 Signet /6 that needs a gas tank and sending unit. What line size should I expect? 1/2" 5/8", etc.? Ebay shows a bunch. Thanks!

 

[EL5DEMON340]

5/16" was stock

 

[SRT_DSTRHOLC]

5/16

 

[805moparkid]

lol 5/8! everything was 5/16 for the most part

 

[longarm]

I wouldn't put anything less than 3/8" in if it
wouldn't cause you too much trouble.
5/16" was stock.

 

[BillGrissom]

5/16 is stock and fine for a carburetor. Indeed, my 383 C-body had that.
I put the 3/8" one w/ 1/4" return in my 65 Dart because I plan EFI.

 

[4spdcuda66]

The subject of overworking the stock fuel pump with a 3/8 size fuel line came up in another thread I read here a while back. Someone said the stock pump would have to work harder to suck the fuel through the larger line. Is there any merit to that, or is that B.S.

 

[BillGrissom]

The subject of overworking the stock fuel pump with a 3/8 size fuel line came up in another thread I read here a while back. Someone said the stock pump would have to work harder to suck the fuel through the larger line. Is there any merit to that, or is that B.S.

I can only reply as a mechanical/aerospace engineer who has designed fuel systems for aircraft engines. There are some amazing "technical facts" spread around by the unschooled, but that is an amazing one. Perhaps you mis-read or mis-quoted. Anyway, there is no way you would have more pressure drop through a larger diameter line (assuming it stays full of fluid and other caveats).