Saw this picture of what was listed for sale as a genuine factory 914-6 GT car. I noticed the picture of the engine compartment shows a odd fuel line crossing over the carbs. Whats up with this ? Why would they do this? I do not see how the flow would allow for it to do anything. I know stock 911 and 914-6 engines do not have this configuration.

Can't say it's original, but it looks like a return fuel system. Keeps the fuel cooler in the lines, and helps with vapor lock.

Unrestrained battery too. In the lower right of the picture it looks like the fuel filter is in the compartment?

Looks like it's setup to use the return line to the tank to keep the fuel cooler ...

Battery hold down is setting in the middle of cooling shroud.

You can see the battery hold down clamp in the middle of the fan shroud.

return lines are slightly superior
especially for track use
especially in hot climates
especially at altitude

picture

can't be a return line - look at it - all it does is balance the psi across the "back ends" of the 2 manifolds, using a pair of non-std inlet/outlet banjos

maybe the "mechanic" did not have the correct banjos?

anyway - a return line is not necessary on a carb'd car - at least 300 million cars have been built without such - the fuel pump is internally relieved at about 6 psi, and that solves the problem

of course - if one incorrectly installs an injection pump instead of a low psi carb pump , you DO have to get rid of a helluva lot of psi & flow

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Yes it can and it is. Check the diagrams on how to route one... as stated above, it's a very competent and effective modification to keep the fuel cooler.

Does anyone have the diagram how to route the fuel lines using this method?
I assume it involves the return line at the fuel pump.

Larrys right, balance line. If you returned the fuel with carbs you would need some sort of flow restrictor on the return to make sure the bowls filled, never seen it done.

Daron

Diagram? You run the outlet of the left carb to the return pipe in the chassis .................

The Cap'n

With the fuel pressure regulator downstream of both carbs.....

The orange car is mine. No such thing as a balance line. Show me a car made today without a return. Cooler fuel equals more horse power. And the fuel doesn't care if it approaches the needle/seat from the front or back.

No he's not.

Grady had posted a few in Pelican.

I found the thread on Pelican, interesting reading. I wonder why Porsche did not set up the cars this way from the factory?