Steve J.

Nobody sells replacement fuel lines (the rubber parts) for my OB. The shop that rebuilds my other hoses won't touch fuel lines (liability). And the old hoses will not come off no matter what. They are brittle and cracked on the outside. Does anyone see any safety issues with cutting the steel tubes and clamping on rubber fuel hoses with fuel line clamps (not the worm gear hose clamps)?

Sean79 5spd

Steve, I think you should try another shop. I had both of those flexible lines rebuilt using the existing fittings. They also did the flexible section of my clutch hose and both power seering hoses. I explained the service of each hose and they had no problem with doing the work. Cheap too, $100.00 CAD.

Sean

blau928

Find out what the metric fitting is, get a metric-AN adapter, and get some braided stainless lines from any speed shop... problem solved....

Rod Underwood

Did you get them for specific lengths / were you able to modify them to fit exact dimensions? I am planning on going this route, but was curious about fit.

Rod

jpitman2

I am doing something similar. I was able to get genuine rear hose from filter to first steel line on body (to accumulator), and the pressure hose from steel line to engine, but not the return line from engine to body. The old pressure line to engine looks to be in excellent condition. FWIW, many japanese cars with efi (some running at 60psi) use clipped hose connections rather than steel connections....apparently safely.
jp 83 Euro S AT 49k

Tony

Try and find another shop if you can. Just dremel the fittigings off the hose and take the fittings to them. For my SC fuel system, I used clear vinyl tubing to get and idea of how long i wanted my hoses. I slid the tubing on the fittings and told them to make lines the same overall lenth. Pretty easy actually?
I always find it funny how places wont do fuel lines yet many of the same shops do hydraulic lines for machinery that prodce tremendous amounts of pressure and have serious consiquences if they fail.
I dont understand the fuel line hysteria with some of these places?

toofast928

Solved this problem months ago. The OEM rubber hoses are double wrapped with a nylon brad in the middle. PUSHED on the barbed fitting. -6 hose is the exact size you need to replace the OEM hose. Just use a Dremel cut wheel or razor blade and cut away the OEM hose, push on - 6 fuel hose and use a worm clamp. Good for over 100 PSI of fuel pressure. (remember Porsche uses push on barb fitting, installing a worm clamp improves the hose to fitting connection)

or
If your pushing more fuel PSI than stock:
Their are no metric to -6 AN adapter fittings available because the steel OEM fuel line has a LINE compression fitting, not of an inverted ball flare. What I did was to take the hose fittining (from fuel line tank to fuel hose) have a welder cut off the barb and weld -6 end onto it. Works great and allows you to use the OEM fuel line. The line is about 3/8 in diam, big enough to feed 500hp.

or
Get a metric adapter fitting at the fuel pump to -6, Run -6 hose to the fuel rail. (Not easy to do)

What ever you do you'll need two -6 AN to metric ball fitting to connect to the fuel feed tube and fuel return. One fitting is 14 mm the other is 16mm. I have these fittings, PM me........

Chuck Schreiber

Steve,

I had mine for the 79 rebuilt by classic tube. http://www.classictube.com/
They did a fantastic job. I bought 2 used lines from Rixter and had them rebuilt. They do old musclecars, etc. The lines looked factory fresh, they even re cad-plated the fittings. I have the old ones off the 79 if you need them. Call me or lets get together in the next few weeks when we reschedule Third Coast.

tammons

No way, dont clamp on rubber hose, unless you want to start a fire. If you spray the joints with PB blaster for several days, you can get them loose.

Otherwise if you want to go to Aeroquip braded lines Global express sells a compression fitting to go from Metric tubing to JIC. The comection at the other end might take more work. I had custom fuel rails with jic fittings so I did not have to bother with that end.

Steve J.

I'll take 'em! Thanks Chuck. I may have to Dremel the old ones off.
I've soaked them with PB Blaster for months and they won't loosen. What is the risk with clamps? Does the hose slip off because of the pressure or rupture because it gets cut by the clamp?

jpitman2

FWIW, I work at a hydraulics hose fitting factory, and I asked about hose to rebuild my engine bay pressure line recently. I was told none of ours is suitable for fuel, its not the pressure (some go to 15,000psi), its the rubber type apparently.
jp 83 Euro S AT 49k

toofast928

"No way, dont clamp on rubber hose, unless you want to start a fire. If you spray the joints with PB blaster for several days, you can get them loose. "

Why? The factory PUSHES ON the hose to the barb. No heat applied, no crimp clamp. The only thing holding that factory fuel line on is the barbs of the fitting.
Remember the max factory fuel PSI is 40. No pressure in return side. Using a hose clamp is just xtra insurance that the hose won't pop off.

Dennis Wilson

JP,

Your guys are probably correct. The high pressure hose used for the CIS system is lined with a nonexpanding plastic. That's why it is so hard to get off the barbed fittings. I've tried the regular fuel injection line on my 931 and it has resulted in cracking due to expansion and ultimately leaked. There are steelbraided fuel line hoses available but the prices are very high.

Dennis

tammons

Steve J - yeah that sucks. I had a car like that about 5 years ago, and I finally did get them off, but it was a real knuckle buster. I would not clamp on to the smooth metal fuel line. If you want to clamp on new hose you should cut the sleeve off the rubber hose/barb and go that route. You could double clamp the new hose to that barbed fitting or I also saw some permanent crimp clamps that were sold at the Aeroquip store here just for that purpose. Also they do sell rubber fuel line that can take fuel at those pressures. Pretty neat really, but what I really thought was cool, was that they also sold that setup for AC fitting so you can make custom AC lines. Just buy the ends, the clamps the AC hose, cut it to length and clamp it together. Instant AC lines.

Toofast928 - He was originally talking about cutting the 10mm steel fuel line and clamping onto that. I cut the ends of my steel lines, but I used a 10mm compression to #6 male jic fitting, but all my FI system was custom.

kary4th

Since you've been working on this recently, do you know offhand, what the size of the fuel line from the tank to the pump is on the '78?