I need to get a fuel tank prepped (rust removed and coated) to go into my 73. I have several to choose from and the one that looks best is a late tank (75?) with the plastic filler, cap & expansion tank. The 73 came with steel cap, filler and expansion tank and I would like to keep them. Can I just swap early filler neck from the early tank to the late tank?

Thanks
Jim

yes there are differances. They are interchangable if you retain
the expansion tank (steel vs plastic) and cap from the respective tank
you plan on using.
But if your suggesting mating the steel expansion tank to the late fuel tank,
no that wont work the attachment points are different.

The difference is in the outlet and return stubs out of the tank. The early (up to '75) had 8 mm supply and 7 mm return. The evaporative system had the charcoal cannister mounted on the tank up front.

From late '74? and certainly '75 and up, the fuel outlet and inlet are the same size (7mm) and the charcoal canister was mounted in the engine compartment, fed by a 1 or 2 mm line from up front (Yes, there were 3 plastic lines coming thru the center tunnel). The '73 charcoal canister cannot be mounted to these tanks 'cause the mounting strap clips don't exist on the tank.

That has been my experience ... BTDT

Please get a tank that matches 73. If you get a later version, you mat as well get a racing bladder, because you've destroyed the originality of the car, and you'll need to make so many mod's. They're out there - get the right one.
Pat

Thanks for all the info.
I have 6 tanks (I think, maybe it is just 5) but the best looking one was a late one with the plastic filler and expansion tank. And by "best looking" I mean the one that looked like it had the least amount of rust inside it. Of all of them I have none are rust free, typical for a 914.
I will probably just pull the tank that is in it now and clean it out. Hopefully it is not pitted badly inside.

Thanks
Jim