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Posted by: Dr Evil Apr 23 2006, 11:18 AM

Well, the fuel pump that ejm so generously provided for my car has done its job as it has provided pressure. What a guy!

Next problem: Pressure in system = found hole in high pressure fuel line

So, where can I get some of the hard palstic CIS fuel line?

Posted by: Series9 Apr 23 2006, 11:43 AM

Where are you talking about?

Posted by: Dr Evil Apr 23 2006, 12:10 PM

Warm up enrichment line off of the fuel distributor. All of my fule lines from the distributor are hard plastic fuel lines.

The line for the 74 is different from the others (of course) and I think that I can get some bulk line from Volvo, but I was hoping for other leads.

Posted by: iamchappy Apr 23 2006, 12:11 PM

http://cgi.ebay.com/ebaymotors/PORSCHE-911-FUEL-INJECTOR-LINES-Cyl-4-5-6-Save_W0QQitemZ8055261335QQcategoryZ33555QQssPageNameZWD1VQQrdZ1QQcmdZViewItem

Posted by: ejm Apr 23 2006, 12:14 PM

Some of the factory CIS lines are formed hard plastic that are shrunk onto the barbed fittings. This stuff springs a leak first time its kinked. I use high quality braided cloth covered hose with pinch clamps and have never had a problem.

Posted by: Dr Evil Apr 23 2006, 12:17 PM

It is the unlabeled piece in this diagram. (arrowed)


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Posted by: rhodyguy Apr 23 2006, 12:17 PM

wow! you're man ed!

k

Posted by: Series9 Apr 23 2006, 12:40 PM

Cut the plastic line off and replace it with quality FI hose and FI hose clamps available at NAPA.

Posted by: Dr Evil Apr 23 2006, 12:54 PM

Not too sure that a thicker walled hose will work in this location, but I will look into it tomarrow.

Napa in town sucks, I will have to go into the city to see if they have the stuff. This Napa doesnt cary, or even know what an FI hose clamp is.

Posted by: dimitri Apr 23 2006, 01:44 PM

I have used teflon tubing on the csi. You bring the tubing to about 210 deg, using
boiling water for heating and quickly insert the banjo fitting. Quick is the trick, no clamp needed, shrinks to fitting. Dimitri

Posted by: Dr Evil Apr 23 2006, 01:50 PM

Where do you get the teflon tubing? Which type and brand?

Posted by: Dr Evil Apr 24 2006, 08:14 PM

Actually Gents, NAPA carries no such thing to help me that I can find. The closest approximation to what I have is McMaster-Carr's 1/8" teflon. I hope it is not too small. The smallest fuel line I could find was 3/16" which is too big. I may be able to get some 3, or 3.5 mm fabric braided hose from GPR that is used in MBZs. Only problem is I do not know the PSI rating.

Any sources would be appreciated. It is the only thing holding my progress up (for now).

Posted by: kwales Apr 24 2006, 08:31 PM

Hey Doctor,

Hose size doesn't matter....

Somehow that didn't come out right....

Flow is controlled by the smallest orifice....

Use the hose connectors to set the orifice size. Putting on a larger hi pressure hose is just more volume for the pump to initially fill when purging air and shouldn't affect the flow at all.

In Doctor speak... an enlarged prostate (orifice sizer) limits flow through the patient's urethra (hose). Surgical removal or cautery of the enlarged prostate tissue surrounding the urethra will decrease the restriction and increase the patient's bladder flow and comfort.

For CIS, the opposite is desired. A restricting orifice sets the flow and the Dr can go. However, electrocautery should never be performed on a pressurized system...

So, does your NAPA stock buggy whips and those orange reflective triangles?

Ken

Posted by: brp914 Apr 24 2006, 08:34 PM

http://www.supertecperformance.com/new-porsche-products.phtml

hope I did that right. might be worth a shot.

Posted by: iamchappy Apr 24 2006, 08:37 PM

Try Henry Schmidt at Supertec he may have a good answer to your problem.
Fabricated fuel lines (black or clear Paramed plastic as used by Porsche factory race cars)

I think they look cool and will probably replace mine like this.


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Posted by: robby750 Apr 24 2006, 08:38 PM

QUOTE(kwales @ Apr 24 2006, 06:31 PM)

Hey Doctor,



So, does your NAPA stock buggy whips and those orange reflective triangles?

Ken

Posted by: iamchappy Apr 24 2006, 08:39 PM

Wow BRP and I are on the same wavelink tonight.

Posted by: Dr Evil Apr 24 2006, 09:14 PM

Thanks guys, I'll be calling in the morning, but I just ordered the 1/8" hose from MC.

Ken,
thanks for the humorous account of Bernouli's principle. I wish that my understanding were the problem, but it is that I am mating said hose to pre determined male fittings so size does matter. Too big and the hose will not clamp on as tight with out potentially allowing leaks. High pressure fuel on a hot engine is probably bad.

Posted by: jimtab Apr 24 2006, 09:55 PM

QUOTE(Dr Evil @ Apr 24 2006, 08:14 PM)

Posted by: rick 918-S Apr 24 2006, 10:42 PM

Regardless of what your DA NAPA clerk tells you, they do sell High pressure black plastic Fuel injection line in bulk rolls. I purchased it there myself. Heat it in boiling water and very quickly install it on the barb'd fitting. I have it running through my tunnel for a return line.

I like the clear stuff shown above better! Cool!

Posted by: Dr Evil Apr 25 2006, 07:04 AM

Rick,
What did "they" call it? I couldn't even find it on their web site. I can go to the city and see if the more urban folks carry it. I have some 1/8" clear on its way, but I would like a back up incase this doesn't work.