kmascotto

As I was going through my Intake refresh and I had a good look at the medal fuel line that comes from the Drivers side and over top of the Valve Cover. Porsche doesn't make these lines any longer and my old one was pitted so I decided to buy another good (used) one. I took the new (to me) fuel line and had it refinished (zink). Here are the results.

PHIL928

Wow that's shiny!! Awesome!

Ducman82

Looks great!

dr bob

Recommendation: Clean all your fingerprints off that part, and spray-paint it with clearcoat to help maintain the fresh yellow finish. Otherwise, in a couple short years, it will be faded to gray zinc again just from normal environmental exposure. Easy to head that oxidation off now while the part is out and easy to paint. Protect the ball end where it seats at the damper.

I'll let Greg B remind you of the risks around screw clamps on sharp-barbed hose fittings.

kmascotto

Good call, I would hate to loose the finish so quickly. From what I had read I thought the screw clamps were the way to go.

Is there a better way?
Thanks

Ducman82

have a hose shop use clamp clamps...

Rob Edwards

One way is to have a length of fuel hose crimped onto your stock hardline:



Another way is to have the hardline modified with a soldered fitting that allows a metric 90-degree hose fitting to be threaded on:



A third is to have the hardline bypassed and replaced with a flexible section of fuel hose covered in firebraid:



Options #2 and #3 are shown here, top and third hoses in the middle column:

kmascotto

Those are some very nice hoses!

I guess people can get into trouble over tightening screw clamps, leading to problems later.

granprixweiss928

I did it also. with a bunch of other parts.

siscogts

OK, I need to find a factory specialized in plating parts, somewhere around here....
Francesco

kmascotto

There is nothing like a Box of shinny new parts!!

dr bob

Post where "around here" is, and you might get some suggestions.

GregBBRD

Thou shall not clamp rubber hose onto sharp barbs made for plastic hose. Those sharp barbs cut the inside of the rubber hose.

Thou shall not clamp rubber hose onto sharp barbs made for plastic hose. Those sharp barbs cut the inside of the rubber hose.

Repeat 98 more times.

Update your fire insurance policy, if you ignore.

dr bob

^^^ Every once in a while, a client asks me about breaching an ASME or other code requirement in software. I --ALWAYS-- ask them to package their suggestion, send it on to their insurance undewriter for blessing before I look seriously at it. Pretty much stops the problem in its tracks. We need to be thinking along the same lines when we make little adjustments or shortcuts to original materials, methods and techniques. Admittedly, there have been significant improvements in materials in the years since these cars were built. Besides Greg's spare-full-time business as 928 guru, he has another spare-full-time business building hose assemblies and plumbing for race cars and race trucks. There's a reason that the pro builders come to him for this stuff, and it's a lot more than just making it pretty. It has to work. Every once in a while we see some little DIY modification that seems, on the surface, to make sense. Then a voice of experience and wisdom (Greg) reminds us of the potential unanticipated consequences, in this case the potential to spray fuel on a hot engine and exhaust manifold and burn the car to the ground in mere minutes...

GregBBRD

My "mantra":

If Porsche thought that rubber hose and clamps was adequate for fuel, they would have done it that way, when they built the cars!

The first few years of the 911 Carrera engines (1984-1989), they came from the factory with a rubber fuel line that had high quality crimps on it. Went from one rail to the other and also to the regulator. We were replacing those lines by 1987. The rubber hose would shrink and leak around the crimp. The "superceeded" line had a very thick external cord re-inforced hose, with crimped ends that were double length and which had a double set of crimps. The metal ends on both lines were made for rubber style hose.

Putting a rubber hose onto a metal end with sharp barbs on it is just about as smart as putting an open container of gas in your garage 20 feet from your water heater. Might not cause any problems the first day, the first week, the first month...but sooner or later, you will learn the lesson.

However, like I've told people for years...for the 928 model to get really really valuable, more of them need to "disappear". Fuel lines with clamps is great for that reason!