Can anyone tell me why a Model T fuel line would have a circular 360 degree bend in it?
Can this possibly be original?
Is this some sort of vapor lock prevention measure? If so, does it actually work or is it another old-wives' tale?
The car is a '25 coupe with an oval tank under the passenger's seat.
Any help much appreciated!
Not vapor lock prevention...any metal tube bent into a coil will absorb vibration and resist cracking. Ever noticed brake lines coming from the master cylinder? They are coiled to prevent stress failure.
So that's it.
I guess I should put it back the way it came off, huh?
Mine is like that too. I won't say it is original, because the only factory photo I can find at the moment is in the service manual shows what appears to be a fairly straight run toward the frame rail.
The reason the lines are coiled from later car's master cylinders is because they are suspended for a distance and vibration will wreck the lines at the fittings if the coils aren't incorporated to absorb the vibrations. metal tube with flared or double-flared fittings will usually fail first at the flare since that is where the most flexing occurs. On the T with the packing connection, there is less concern about stress cracking since the packing acts as a cushion, something the flared fittings lack. There is no part of the line that is "held fast", so it wwould be less likely to crack on the T.
Ray, I believe some Model T's do in fact have a place where the gas line is "held fast". My '19 Touring has a gas line clamp from the frame between the tank and the carburetor. I do not know what years it was used for specifically but some catalogs list it as
part # T-2916. .....Michael Pawelek
Thanks Mike...good point. Actually I think my TT also has a bracket and clamp somewhere under there. There really should be a clamp somewhere to prevent rubbing a hole in the line. I was mainly referring to the nut area though at the settlement bowl not being a held fast connection like a flared fitting would be. The lines aren't as apt to stress cracking at a clamp where the line isn't altered as they would where they are flared or severely worn from moving in packing material, but then again we are talking about 80+ year-old tubing so no potential problem area should be overlooked.