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Join Date: May 2003
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1977 911 Tunnel Fuel Line options

I need to run a new fuel line through the tunnel on a 1977 911. I have an EFI Twin Turbo motor and a Fuel Safe Fuel cell installed. Everything uses AN fittings (-8 feed, -6 return) so I was wanting to hear/see what other High HP turbo cars were using in this application. I know the space is tight in the tunnel. The engine and trans is out so now is the time to get something in there. I did pull strings through when the old lines were removed.

The car is primarily a street car (full interior) but will see the occasional DE.

Suggestions?


Bill
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Bill Jones
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77 Euro 911 3.0 Wide Body - under construction
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Old 05-10-2010, 11:17 AM
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I put new stock OEM lines in when I did my EFI system so they can handle the fuel. So you should flow more than enough with one -8 (1/2") line from front to back.

The newer non-braided lines are lighter and cause less rubbing damage than the SS braided lines, so that's what I'd go with if I ever replumb my car.
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Last edited by David; 05-10-2010 at 02:06 PM..
Old 05-10-2010, 02:04 PM
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Ok, so after some thought I realize that -8 is a bit overkill for a 5-600HP car with EFI. Has anyone used the aluminum lines in the tunnel? Jegs has some in 5/16th and 3/8th that is powder coated black. Morosso does have 1/2 inch as well. 25 feet for between $30-$50 depending on brand. It is certainly light weight! I would transition it as soon as it leaves the tunnel to braided stainless.
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Bill Jones
Jupiter, FL
77 Euro 911 3.0 Wide Body - under construction
http://www.flickr.com/photos/rennsport/collections/72157618856489537/
Old 05-10-2010, 07:03 PM
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I grabbed this image from a post by Bob (dhrcr911s) and wanted to expand on it by adding annotations for the various items within the tunnel.




#6 is obviously the wiring harness to the rear of the car. Please help me ID the rest of the items.

Bill
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Bill Jones
Jupiter, FL
77 Euro 911 3.0 Wide Body - under construction
http://www.flickr.com/photos/rennsport/collections/72157618856489537/
Old 05-11-2010, 05:00 AM
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I don't see anything in that picture that looks like the stock plastic fuel lines. They're shiny black plastic in the tunnel. Maybe that's an older car.

I'm sure many have used non-stock, but my concern was the size of the entrance holes in the body. It's a tight fit with the special grommets and the stock lines, so I imagine some modification of the existing hole would be needed to run larger lines and a grommet.

With that said, I'd probably use the 3/8" hard line for supply and return and try to use new OEM grommets. I'd have the hard lines sticking out front and rear so no fittings are inside the car.
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Old 05-11-2010, 11:08 AM
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Maybe you could use the same black plastic nylon fuel line that come is newer model gm and ford vehicles.

It is a shiny black plastic fuel line made of nylon. There is a kit to repair the ends made by a company called Dorman. You could possible adapt the ends to -an or braze the flared ends to some -an fittings and use the quick disconnects that come in the repair kit.

The fuel lines come in 3/8 and 5/16

Here is a pic of the kit.
Old 05-11-2010, 12:22 PM
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I have a flexible bore scope that I will be sticking in the tunnel this weekend to have a look around. I pulled the strings in when i removed the old lines many years ago. I should be able to follow the string path to what room is available.
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77 Euro 911 3.0 Wide Body - under construction
http://www.flickr.com/photos/rennsport/collections/72157618856489537/
Old 05-11-2010, 12:55 PM
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While working on my seats recently, I noticed that the fuel lines run in an enclosed tube on the drivers side, at the top of the tunnel, from just in front of the rear shift coupler cover to 7-12" past the shifter. This keeps it from rubbing on the shift rod, e-brake cables, etc.
Old 05-11-2010, 04:12 PM
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