Confused about fel lines for CIS pump relocation

[rrichar]

I am replacing my sway bar mounts with Wevo mounts so therefore I have read all the threads about moving the fuel pump to the front and am a little confused about fuel lines. My questions are around fuel line sizes.

I have a 1974 911S that has a later model fuel tank with the threaded return line. I have converted to Webers but have retained the Bosch CIS pump. It seems to me that there are some sizing issues with the fuel lines. Coming out of the fuel tank is the larger line (1/2 inch equivalent?) into the pump but the outlet from the pump is the smaller line (5/16 equivalent?) but into the through the body line that is back to the bigger size. Do I just use a hose adapter to increase from the smaller size coming from the the pump to the larger size going into the through the body line? Then do I do the reverse at the rear of the car, going from the larger through the body line back down to the smaller lines that run to the carbs, etc. Is there a better way to address this difference?

No one seems to have mentioned this in the other threads so any help is appreciated.

[Tidybuoy]

I haven't relocated my fuel pump yet (I have a '74 too). But I suspect that the larger line is due to the fact that the input to the pump is large volume and since the pump was originally at the back of the car, it was large line and tube all the way until the pump.

I've read where many guys replace the tunnel lines at this time and you can get the correct size lines made out of the same material as the fuel injector lines, with fittings at each end for screwing onto the tank and onto the engine compartment area.

I don't remember the name but there is a guy on this board that makes these lines and his handle has the word Boxster in it. I purchased new fuel lines from Unobtainium.com and you can also get the correct line there. You might try a search for fuel lines and you probably will find this guy.

Vern

[Tidybuoy]

Ok, I found a thread with the guy who makes the lines. He is BoxsterGT with e-mail of Len at Autosportengineering dot com


Here is a link to the thread:
Replacing Plastic CIS Lines with Late Metal Lines

[rrichar]

Vern,

Thanks i really. don't want to change the through the tank line at this point, mine seem to be in good shape currently.

I had already sent Len an email yesterday but haven't heard back yet. I too had used him when I put in the later model tank.

[rrichar]

Any more thoughts would be appreciated, what have you done when you did yours?