[JP Noonan]

If you follow the article you should do fine. I think they added some of my comments to the article but here they are again anyway.

It depends what year your car is. The 70-74 cars have a 5/16" (7mm) return line and a 3/8" (9mm) feed. This is why the factory used that expensive 9mm to 7mm rubber line between the feed and the pump (the 70-74 pumps have 7mm inlet and two 7mm outlets). Also the tank has a 5/16 inlet but a 3/8 feed. THEN you get to the back with the fuel rails, they are also 5/16" (well, this is one I'm not 100% about, so check it out for yourself first) so does it really make sense to use 3/8" at all? I guess the factory did it because the 70-72 cars also had 6 cylinder motors so a bigger fuel line was needed. If you have a 70-4 car I suggest using a filter with a 3/8" inlet from the tank(make sure to use a FI filter and not one for a carb) and a 5/16" outlet. From there go to the 70-4 pump inlet, then to a 5/16" feed though the tunnel, an elbow at the back, a steel line up to the fuel rail (remember to use a heavy duty grommet when you go through the engine sheet metal) or a braided steel hose. On the return line also use 5/16" back to the "damper" on the pump then to the tank via a brass "T" fitting (the T fittings I've seen were plastic, I don't know if this was factory but I think brass is a better idea).

If you have a 75-6 things are a little different. The factory used 5/16" line on both the return and feed. A 3/8" feed "can" be put in but the factory gommets are 5/16" and make your life miserable BTDT. Also then you will need an adaptor from the pump to the line (here is another one I'm not 100% about, check to see what size the 75 pump outlet is). So just put 5/16" in for both.

The other thing is I put the lines in a 75 2.0L with factory exhaust and a bolt on deep oil sump, so it can be done. However, like most things on a 914, it is easier with the engine out. Also a second person helps, they can feed the line down the center tunnel while you feed it though the grommets. Which reminds me, wire lubercant (the type electricians use to pull wires through a conduit) or liquid soap help getting the lines through the grommets.