CIS Fuel Line Fitting & Refurbishing Services

[onyxco]

I am in the midst of restoration of my '73 car. As part of this restoration I plan to replace all of my existing 3mm & 6mm tubing.
With all of the CIS cars that are still out there running, I am hoping to find somebody that has the experience & tooling and is familiar with re pressing the new tubing onto my re plated barbs.

Thanks!

[timmy2]

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[onyxco]

Originally Posted by timmy2

Search for posts by BoxsterGT....


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Thanks! Sent PM...

[E Sully]

The factory lines use a press fit for the fittings. Never use heat or any lube. It is recommended to remove old line from fittings with a soldering iron. A sharp instrument can scratch the fitting, causing a leak at the high fuel pressures. In this thread is a link to Verell, he can supply different hoses. I have also purchased injector lines complete with fittings from the local Porsche dealership.
CIS Fuel Lines

[onyxco]

Originally Posted by E Sully

The factory lines use a press fit for the fittings. Never use heat or any lube. It is recommended to remove old line from fittings with a soldering iron. A sharp instrument can scratch the fitting, causing a leak at the high fuel pressures. In this thread is a link to Verell, he can supply different hoses. I have also purchased injector lines complete with fittings from the local Porsche dealership.
CIS Fuel Lines

-I removed all line ends with heat
-All fittings were re zinc plated
-Correct Cohline tubing was purchased
-I simply need one to press fit the lines on to the tubing
-Verell will not do this work
-Just looking for one that has the capability, tool and experience to perform the job.
Thanks!

[fanaudical]

I managed to do this in my garage with some improvised equipment:

- I used an old 3-jaw lathe chuck to hold the end of the tube. I left just enough tube sticking above the chuck to receive the fitting.

- I placed the lathe chuck on my drill press and chucked a piece of plastic rod as a "pusher".

- I placed the fitting barb into the hose and used the drill press as a small arbor press.

This arrangement worked well. There are other threads here on the forum describing how to make wood blocks to hold the tubing and a small arbor press to insert.

Sorry - I'm not interested in doing the work for others; just passing knowledge so you can do it yourself. It really isn't that difficult.

BoxsterGT does this work and is a good guy. Hey may be able to help you.

[Tidybuoy]

First off: that is a great looking engine!

I redid my CIS lines following a post on this forum. I don't remember who posted but I followed his guidelines and it worked perfect. Basically, I took a piece of hard wood (oak or something not soft) and drilled a hole that was slightly smaller than the cis line. Then I drilled a slightly bigger hole thru the first hole but only about a 1/2 inch deep. The second hole is to allow for some expansion when you press the fitting into the hose.

Next, I cut the wood on a band saw (another saw with a find blade would work). I cut the wood in half directly down the middle of the pre-drilled hole. This basically gave me two pieces of wood that would have a hole down the center if you put the two pieces together (kind of hard to explain).

Now you put the cis line into the hole and press the twp pieces of wood together in a vise. At this point you have a cis line that will hold still while you tap the fitting into the end. If the cis line slips at all, the hole is a little too big and you will need to start over with drilling a smaller hole. Once the wood holds the line in the vise, it's a cinch to tap the fitting into the end. The wood is needed because it helps to have the fitting tapped in perfectly straight.

There is some trial and error so buy enough cis line to waste a little bit. I did my entire cis system in a few hours.

[timmy2]

I have used the drilled and split board method myself. Works great!


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[HarryD]

Above advice is good but if your lines are ok, LEAVE THEM ALONE,

Unless they are leaking, you do not need to replace them. Mine are all original (except the one I accidentally nicked while futzing in my engine room). I really do not want to have the "fun" of replacing one of these lines unless I have too,

Also, be sure you get the correct wall thickness material. Some vendors sell the correct Nylon material but the walls are too thin and it results in misfires. This thread may be helpful in understanding: CIS misfire

[timmy2]

Harry,
He did say he burned the old ones off, had the fittings zinc plated and bought the correct cohline for them...
I think it may be too late to leave them alone...

[HarryD]

Originally Posted by timmy2

Harry,
He did say he burned the old ones off, had the fittings zinc plated and bought the correct cohline for them...
I think it may be too late to leave them alone...

You may be right but who ever reads the ENTIRE thread anyway?

I guess the real message of my post is to be sure the replacement parts are correct as some will create more problems.

[Ronnie's.930]

Originally Posted by HarryD

You may be right but who ever reads the ENTIRE thread anyway?

You didn't need to read the entire thread as that information was in the first and fifth posts!

[Flojo]

I simply baught new ones.
They are not that expensive.
Payd max $150,-

[BoxsterGT]

I have been working on these Polyamid lines for a while now. Have had success with the simple ones........





but having great difficulty with the compound lines w multiple connections......



It appears each one requires a fixture and a unique way of holding the fitting while pushing the poly line on. Then of course the orientation must be correct relative to the fitting at the other end. Once on, these lines don't move or rotate at all.

Len

[rpc356]

What year is that last fixture for? I got one with some other CIS parts but couldn't find it in PET.

[onyxco]

Originally Posted by Flojo

I simply baught new ones.
They are not that expensive.
Payd max $150,-

If you could find me a new set of CIS lines for $150, you would have a friend for life. Where could I find these lines you are talking about!?

[fanaudical]

I was able to make the compound lines with my "lathe chuck as a holder" method. If I remember correctly, I did make a special wood "shoe" to act as a pusher block for the funky fitting.

[E Sully]

You can buy lines, but not for $150. You can make them for around that amount using old fittings.
This is the line from the Fuel distributor to the injector.
Pelican Parts - Automotive Parts and Accessories - Porsche & BMW
Wur
Pelican Parts - Product Information: 911-110-097-01-M20

[BoxsterGT]

rpc356 -

This is the return fitting on a 80SC I think. If you have any of the CIS fittings like this you want to sell, please email me. I am always looking for good examples as cores.


E Sully -

This is a very helpful tool. Its just difficult to get the multiple lines back on in the tight angles while pointing in the right direction.

Len

[E Sully]

Another member made a tool out of hardwood. Easy Fuel Line Repair