Main fuel line/ CIS fuel line question 78 911sc

LEAKYSEALS951 · 09-21-2013, 06:06 AM

Hello,

After a long time away from air cooled 911's in a 944 turbo, I have seen the light and returned to 911 basics! The bad news is that my 944 turbo burnt to a crisp. The good news is I found a 78 911 in good condition that I want to have for years to come.

Anyway, my 944 turbo caught fire and completely burnt while I was driving it. Watching 10+ years of work go up in flames sucked. FYI- even the fire extinguisher didn't do jack. Not wanting to repeat this, I want to go through the 78 fuel system and "preventatively" replace the 35 year old lines.
The main fuel lines have light checking in them. I referred to this article for the front fuel line near the tank:

Replacing fuel lines in an '81 911 SC

but have found no information on the site for the rear line from the chassis to the fuel accumulator: NLA, and thats the 80+ onward. Not even a mention of 78'.

Pelican Parts - Product Information: 911-356-087-00-OEM

Anyway, how do you guys handle this one? Any advice? Also, The plastic CIS lines look okay, but all the rubber insulation is shot. After the fire I am paranoid about any potential fuel leak. Is there a consensus on what to do with all the plastic CIS lines, or anygood sources of people who would make up a completely new set?

Iv'e included a pic of the main fuel line checking, as well as the cracking insulation around the (hopefully still good) plastic cis lines.. But "hoping" didn't help me with the 951. That sucked!!! (I also hope the resolution is good enough to see in the uploaded images).

Thanks!
Ron

LEAKYSEALS951 · 09-23-2013, 09:38 AM

bump

Brown747 · Brown747's Garage

Do a search for member BoxterGT . Len Cummings will be able to set you up with all your fuel line/hose needs.

HTH Thor

theiceman · 09-23-2013, 11:46 AM

i have a 78 also .. i just redid my entire CIS a little while back and found all the fuel lines in outstanding shape. I put it back with the same lines.

BoxsterGT · 01:42 PM

Its been my experience that the CIS lines in the engine bay very seldom fail.

The rubber cover is another story, as that is subject to age & conditions as all rubber hoses are. The Polyamid tube itself is practically bulletproof. Only when it is pulled or kinked in some way might it have an issue. That might happen during some major service/engine drop.

The main fuel lines up front are another story. Again, its the rubber hoses that fail. They are permanently crimped to a coupler to the Polyamid tunnel lines.

I make up replacement Polyamid Tunnel lines that have M14 fittings so one can replace the rubber parts as needed at any time. Of course I also make the replacement hoses both front and rear.............

This is my alternative to the problem since the factory rear hardlines and J hoses are now NLA from Porsche.

Please email me for details.

Len at Autosportengineering dot com

LEAKYSEALS951 · 09-23-2013, 02:24 PM

Thanks for all the advice,
and thanks Len,
I will be getting in touch with you later this week. You seem like to "go-to guy" for all the fuel line work around here! I saw some of your steel braided line as well. Beautiful. I definitely want the complete supply and return lines from the tank to the accumulator. And I agree with the CIS lines as well...they are probably OKAY....but.. although I "think" the CIS polyamid line is probably "o.k", my concern is what you mentioned.. The car is 35 years old. The engine has been out twice and the car has been owned by 5 different owners. Even the previous owner was tinkering with the lines around to get a new air box in. He took good care of the car, but he also put in 5w30 oil if you catch my drift. Who knows what wrenches have slammed into them during 35 years of plug changes and what not. Some of the CIS components have been changed as well. Vacuum lines have been redone. The compressor has been changed several times- people have fiddlefotzed. Since the plastic lines are all covered by the old rubber coating, I'm scared someone has potentially hit something and weakened it-- maybe/maybe not.. but after seeing my last car go up in flames last month my comfort level with leaving the original CIS is not so hot right now.
The main lines will be a definite..and I at least want to price out a CIS line replacement at this point, and if that doesn't work out I might have another option that will make you happy.
Anyway, thanks for writing and I'll be in touch email by later on this week (I have Thurs and Fri off).
Ron

BoxsterGT · 08-03-2016, 03:23 AM

Thought I would bring this to the top as I am offering a replacement for the 911.356.087.00 Fuel line that is NLA from Porsche.

This is made with E-85 rated hose and is considered by most to be a correct factory level part.

For info please email me only.

Len at Autosportengineering dot com

BoxsterGT · 11-28-2016, 06:22 AM

In case anyone needs this.........still NLA from Porsche.

To the Top!

Mark Salvetti · 11-28-2016, 09:29 AM

Len, since you're here, there is something about the SC fuel lines (mine is a 1979) that I've been confused about.

Since the front rubber lines are permanently crimped to the tunnel lines, does that mean the only way to replace them is to buy your new set of front hoses and tunnel lines together?

I was planning to buy your front lines and engine compartment lines, but leave the tunnel lines in place. Am I correct that this isn't possible?

Thanks,

Mark

BoxsterGT · 10:23 AM

Hi Mark,

The factory lines come with permanently crimped front hoses, and rubber hose will fail with time and conditions.

When your hoses do fail, Porsche makes you buy the whole assembly including the Tunnel lines and with the same old rubber compound that may have been on the shelf for years.

That's why a few years back I started making the tunnel lines with fittings at each end. It made them universal; able to fit a number of different air cooled models and able now to use the latest E-85 rated rubber hose. Another benefit of my Tunnel lines is that they are straight, and can be easily pulled through the tunnel at the rear (with a coupler I include) as you pull the originals out the front. Still another benefit is the hour(s) of mechanics time saved in not needing a "Fish-Line" to do the job.

There is no practical way to re-connect replacement crimps to the front. I offer repair hoses with high quality Norma Hose Clamps that Porsche uses that will work for a reasonably long time.........

Not really as permanent as a crimped assy would be, but the benefit of the latest E-85 rated hose is still there.

Hope this helps. Please email me for more info.

Len at Autosportengineering dot com