Leaking (spraying) CIS help.

imaircooled · 06-21-2010, 05:43 PM

My car is a 1974 911 Targa with a 2.7 and CIS. The other day I noticed it was spraying.....yes spraying fuel out of the top of the fuel injection while the car was running. I'm a beginner Porsche mechanic and need some advice. I haven't touched the car since I noticed the spraying fuel. I have had a garage full of stuff that belongs to my sister in law until she moves into her new house. She is moving in this week so I'm excited to start working on my car hopefully in time to get ready for the Porsches 2 Oxford show at the end of July.

I've attached pictures below showing the unit that the fuel is spraying from. I don't even know what this piece is called. It's spraying out where the hard fuel line comes out.....where the line attaches. I'm wondering if there is an adjustment to the line by moving it closer to the firewall or back towards the rear bumper that would make it stop leaking. Or does it just need a new line? Hope this is clear enough. Thanks in advance for your help.

HarryD · 06-21-2010, 05:50 PM

If you black line is leaking, it will need to be replaced. If it is the banjo fitting, with luck, you should be able to get new sealing washers and replace.

Scott R · Scott R's Garage

Are you saying its spraying from the line going to the center of the fuel distributor in your picture? This line comes from the warmup regulator on the drivers side intake runner to the top center of the fuel distributor.

If it's leaking from the banjo fitting a few new crush washers should do it as suggested above. They can come lose at that connection. If one of the plastic lines has failed source a used one, or multiple used ones.

HarryD · 06-21-2010, 08:56 PM

The unit in your picture is called the fuel distributor.

Where EXACTLY is the leak?

tab tanner · 06-21-2010, 09:32 PM

If it's leaking at the line, I have the correct Porsche tool to reinstall the line back on the barb fitting. I have in the past been able to cut the end off and put the fitting back on, this will shorten the line a small amount.

imaircooled · 06-22-2010, 04:27 AM

Harry,
I believe it is spraying from the line just under the banjo fitting. In the first picture, right in the center of the picture is where the fuel was spraying from. I will loosen the fitting and see if I can't move the line just a bit.

Scott,
It's not spraying from the line going to the center of the fuel distributor. In the first picture, it's coming from the right most line at the fitting.

Tab,
I will take a look and see if it's actually the line or the fitting that is loose. What does that tool look like?

Thanks guys, as always, for your good advice.

Walt Fricke · 06-22-2010, 10:15 PM

Chris

If you open one of your pictures with Microsoft Paint (comes with Windows, I think), you can figure out a way of marking the picture. Save the picture as a .jpg under a new name, repost, ans say "the fuel is spraying from the red dot" or arrow (if you can make one) or where I have a circle, etc. Don't worry about not being able to make round circles or straight lines with typed legends like some of these guys can. But then we will know just where you saw the spray. Words aren't quite cutting it.

Walt

BoxsterGT · 06-23-2010, 01:55 AM

The plastic tube is called Polyamid and made by Cohline in Germany.

If in fact the leak is from the tube I should have the correct stuff for you.

The key is the heavy wall thickness to prevent expansion of the line or what is called fuel surging.

If you email me I will send you whatever length you want. Don't know the price but its cheap.

Lots of threads on this board on how to assemble it using your old fittings.

Len at Autosportengineering dot com

imaircooled · 07-11-2010, 06:34 PM

Everyone,
I finally got to take a look at my fuel distributor and found out it wasn't spraying/leaking where I thought. At first, I thought it was coming from one of the injector lines at the fuel distributor. It's coming from behind the fuel distributor. Of course, where I can't see anything. I was wondering if anyone that has their engine out could take a picture of the fuel lines that are directly behind the fuel distributor. Also, time has taken it's toll on my engine pad inside the engine compartment. Is it fine to run without one? What is it's function? Does it protect the car from heat or sound?
Thanks again,

HarryD · 07-11-2010, 06:41 PM

You can run your car without the pad. It provides limited sounds damping.

As far as you leak, take the U shaped horn off between the Air box and the throttle body. You may be able to see the leak better.

imaircooled · 07-12-2010, 05:13 AM

Harry,
I think I did take off the horn. It did help a little. I need one of the extensions with the mirror on the end of it. I'm getting really close to finding the source of the leak/spray.

Thank you,

imaircooled · 07-18-2010, 04:10 PM

It looks like the leak/spraying is coming from a fuel line right behind the fuel distributor.....Man, I can't see behind there! So I searched and found a couple different answers to: Should I take the fuel distributor off so that I can get to the fuel lines better? I saw it's easy to take it off just be careful of the piston and then I also saw don't mess with it if it isn't broken.
What do you guys think?
Thanks

Scott R · Scott R's Garage

Do a partial drop and find the leak, then do a complete drop and repair it. Reseal everything at the same time.

imaircooled · 07-18-2010, 05:42 PM

Scott,
While I was researching taking the fuel distributor off I did see a couple people mention a partial engine drop. I will take a look and see what's involved.
Thank you,

imaircooled · 07-18-2010, 05:43 PM

Scott,
Also, what do you mean "reseal everything"?
Thanks again,

Scott R · Scott R's Garage

Quote:

Originally Posted by imaircooled

Scott,
Also, what do you mean "reseal everything"?
Thanks again,

Just a reseal of the CIS. New copper rings on the fuel lines, new intake runner boots, keyway gasket, throttle body o-ring, injector o-rings, CSV o-ring. Just a refresh of the injection system. It's so very easy to do with motor out if you end up going that route.

Walt Fricke · 07-19-2010, 01:22 PM

Chris

You can remove the fuel distributor without running undue risks by removing the entire cast metal part which bolts onto the right side of the plastic air box. You can't inadvertently screw something up that way. But you do need to have on hand the gasket which goes between these two pieces.

That should give you the access you need to get at the fuel line connections on the backside of the distributor.

imaircooled · 07-25-2010, 04:36 PM

Ok, I got a mirror on an extension that has an LED light and it helped immensly. Another motorhead came over and helped me with replacing the line. With the mirror we were able to see the line immediately. Its the line that has crazy bend in it going into the back of the FD. So thanks everyone for your ideas because they all helped.

So, I'm trying to get my car so that its driveable to the Porsches 2 Oxford show next weekend (7/30 and 7/31). So after the fuel line issue was corrected. I also replaced drop link/sway bar bushings and rebuilt one rear caliper. I'm awaiting a new caliper for the driver's side and I think the car will be ready.

Thanks again for your help,

Do you think the drop link/sway bar bushings need replaced?