74 CIS Fuel Line ?

[gustaf]

Well, I'm just about ready to put the motor back into my car but I want/need to replace some of the fuel lines.

In particular, I want to replace the rubber return line from the fuel distributor, the rubber return line from the WUR, and the plastic supply line from the filter to the fuel distr.

-What type of fuel line do I need to use to replace the rubber return lines? Should they be high pressure or is reg. fuel line OK?

-The plastic supply line on the 74 CIS is heated/crimped onto the barbed nipple on the fuel distr. Could I cut this line and replace with a high pressure rubber line that is clamped onto the nipple or does it need to be replace with another plastic line?

Please help...I want to get on the road ASAP!!!

-Dave

[gustaf]

Can anyone help out? I want to get the engine in by this weekend..

[wckrause]

I haven't seen many answers on this board to repair/replacing CIS fuel lines. There is a special tool required to press a new line onto the barbed fittings, and that tool is no longer available. I saw a thread a long time ago about how to make your own tool, and there have been recomendations to go to a hydraulic shop to get custom lines made. Maybe somebody can add to that advice.

I purchased the fuel line from the accumulator to the fuel distributor and cold start valve from my local Porsche dealer. It was very expensive. I think if somebody could make a replacement kit for all of the FI lines in the engine compartment, they would have a pretty good market.

[Porsche_monkey]

I made completely new lines using rubber (fuel injected rated) gas line. I also replaced the Porsche fuel filter with (gasp) a Mustang 5.0 filter. I just put some brass JIC 37 degree fittings on the end of each line and sldered fittings onto the filter. Seems to work fine, and the Ford filter fits in where the P filter should fit.

[tholyoak]

Gustaf

You can make new lines using the proper tubing which is available from McMaster Carr (nitrile ?), and reusing the original barbed fittings. The fitting is pressed into the plastic line using the original tool (NLA) for the procedure, or a home made version. There was a thread on this a while back if you search the archives.

I did this with the line to the cold start valve and it worked well.

I have a bunch of the tubing in different diameters as well as the homemade jig for installing the line. I can give you some tubing and show you how it is done if you want to stop by. I'm in Woburn, MA

I don't recall any of the fuel lines after the accumulator and filter being rubber, I thought they were all the nitrile line. However, I may be mistaken. Most of the nitrile lines have a rubber sheath to protect the actual nitrile fuel line.

The CIS system opperates at very high pressures, you don't want to use regular fuel hose here.The last thing you want is fuel leaking around the engine.

Todd

[Jim Sims]

The black plastic fuel line is nylon. See the below link. Jim

looking for F/Injection hose.....

[DRV]

The fuel line tool is made by schley products www.sptool.com part no. 85400, schley doesn"t sell retail but can tell you where to get it. Pendergrass tool specialist in Somis, Ca. sells schley products, (800) 926-1847. This tool is to grip the fuel line so you can push it on the fitting. This tool is a copy of the one shown in the factory manuals.
Dennis Varney

[jk911]

gustaf,

I have done the same thing, i.e I changed my fuel lines off the fuel pump .

Problem... you can't use rubber lines on the high pressure lines ie from the fuel pump right through to the fuel distributor they will expand and possibly blow under pressure. Its o.K for the return lines.

Solution ! its easy to replace them I did it a couple of weeks go. Just cut the old lines off and buy some "POLYAMIDE" fuel line its the hard plastic line porsche used. You simply heat up the line in boiling water or a heatgun and push it on ! OR you can use a rubber hammer to get it on .

Problem (I found) ! .. was getting my hands on this fuel line , most fuel injection suppliers can get the thin lines ie. 6mm 3mm and 1mm but the line from the fuel pump right through to the fuel distributor is 8mm inner diameter ! I managed to get it from Volvo by the meter ! (not cheap!)

Let me know how you go.

[Talonz82]

I needed to replace some of my fuel lines and injector lines which were the plastic w/barbed nipple.

I took the lines to a mack truck repair facility, the line was measured and an identical line was air line for some mack truck component.

They heated the barbed nipple in a vise with a blow dryer, then pushed the hard plastic line onto the fitting.

Worked like a charm, the replacement line was made out of the same material, i used clear tubing from Lowes home center for the outer shielding.

email me if you have any questions.

Peter

[gustaf]

Guys, thanks for all of the help. The engine is in and all the fuel lines have been replaced.

Thanks!

-Dave