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Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 1:56 pm
by Loz
I'm at the stage where I need to install the fuel lines on my 70 911T. It's a US car in case that makes a difference.

What I need to know is what I'm missing. The photo below shows everything I can find from when the car was taken apart by myself around 12 years ago. I also have the original pump (not pictured) that will need taking apart to fit a new main O ring. If anyone has a link for a rebuild kit for that, or particular sizes required, I'd be very grateful for the info.
From some of the YouTube videos I've watched, they seem to have two hard lines in the tunnel. I have one but can't find or remember removing the other.
Also I've included a photo of the engine as it sits. If there's anything missing from the fuel system that should reside in this area, please let me know.

Much appreciate all help offered.ImageImage

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Re: Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 4:40 pm
by SeanP
A 911T on carbs only has one line running through the tunnel if I remember correctly.
MFI has a flow and return line.
The long straight one runs through the tunnel. The second pipe with the 90 degree bend sits under the rear seat. The third pipe with the Tee feeds the carbs

Re: Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 6:38 pm
by Loz
SeanP wrote: Tue Mar 31, 2026 4:40 pm A 911T on carbs only has one line running through the tunnel if I remember correctly.
MFI has a flow and return line.
The long straight one runs through the tunnel. The second pipe with the 90 degree bend sits under the rear seat. The third pipe with the Tee feeds the carbs
That's great! Thanks Sean!
I thought it was old age creeping in. Trouble is I spent at least two hours hunting the workshop today for the second hard line 😁
So nothing missing that you can see?

Re: Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 7:26 pm
by Gary71
My carb 911 has feed and return hard lines… does it depend where the fuel pump is? Mine is on the rear crossmember.

Re: Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 8:09 pm
by Loz
Gary,
Stretch sent me a useful link that gives varying opinions on the hard lines, with a mention or two on pump and positions. Hope this helps.

https://share.google/iBgSEFCEtWwI1j88L

Re: Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 9:42 pm
by SeanP
Should be a Hardl style fuel pump for a 1970 T with only two ports.
Do you have a picture of your fuel pump?

Re: Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 10:03 pm
by Loz
Sean, I've just grabbed this photo from Pelican. This is the pump I have. 3 ports. It's mounted at the front right by the tank. Image

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Re: Running Fuel Lines - Help please

Posted: Tue Mar 31, 2026 10:18 pm
by Gary71
That stacks up with just one tunnel hard line. Return comes straight off the pump back to the tank