Porsche 924 injector lines custom made to original specifiation

[Project9241979]

Hello everyone,

The fuellines that come from the fuel distibuter and go to the injectors are not in the best condition on most 924's. On later models('80 and up I believe). Those fuel lines consist of metal tubes at the distributer and injectors and nylon hose connecting the metal tubes. the nylon hose is protected by a rubber hose which slide over the nylon. the rubber protection is what fails first. it starts to crack and exposes the more fragile nylon underneath(which also gets hard over time). This does not enhance the look of your engine bay to say the least, and can be dangerous if the fuel lines start to leak. unfortunately these hoses are no longer available, until now!

I've found a company that can make the inner nylon tube to the original size and spec! The only problem is that production starts at 750 meters of hose.

I want to make the injector lines available again and was thinking of selling a kit which will include the inner nylon hose and outer rubber protection hose. at around€150 per kit. I will need to sell 15 to 20 kits to be able to order the nylon tube(ordering 750 meter of custom tube in not exactly cheap). So I was wondering if anyone would be interested in a kit to freshen up their fuel lines on there Porsch 924?

the fuel lines I'm talking about are the ones highlighted below (7 lines total and a few shorter pieces)

let me know what you think!

Ryan

[Monkey Wrench]

do the lines coincide in size with the early 944?
I dotn know everything ( yet lol) but it seemed quite expensive to replace it all with OEM parts. someone a while back posted the fittings needed to convert the system to anodized aluminum fittings. the post and parts list was made ofr a later versio or maybe 16 valve engine but many of the parts seemed to be in common.

I did contact a hydraulic hose place I deal with quite often but was told they will not do fuel lines and the referred me to a local supplier of the anodised aluminum style fittings. I called them and they said the line is fine, its not metric line, so the fittings need to adapt.

as you state, the problem is that the metric lines are not common in NA nor is the crimping machine or dies for this.

for some one with a very original 944 i can see spending the extra money on OEM So for me I figured Id just remove all the parts and try to match up the fittings needed for the conversion to the anodised aluminum fittings.
my early 85 and those earlier had a metal tank, and no prepump needed as it was fed by gravity from the bottom of the tank to the main pump whereas later models incorporated a pre pump.

my gas line rotted out and it did let the whole tank go, so a warnign to others with early 944's DO check that fuel line where it exits the tank, it could cause a massive fire or explosion. mine was being stored outdoors so no incedent.


the 16 valve engines seemed to have more sources but I think its all available, just a little pricey for what it is. some models seem to run more fuel line overtop of the exhaust manifold than others do. and peole have been warned of the possibility of engine fires likely caused by deterioration in this area.

I did have a good conversationa few years back with a guy than can build them, with metric line, you may have had contact in your search for the line.

late 80's volvos may have a similar type of line, they have a prepump under the car and a length to the fuel rail, they do not seem to have a opening for the fuel pressure guage. early 90s I think they added a schraeder valve. my 88 ford van also bosche FI , has a schraeder valve and pipe thread fittings so I connected there.
in my 3 old 80's volvos I have a simialr issue I dotn have a place to connect a fuel guage so it need a sort of a T fitting with the right threads. I bought a fuel pressure tester but none of the fittings fit.


I was planning to cut the end off a volvo fuel line and also the end of a spare fuel rail to get the fittings so I could connect my guage, Im not certain yet if that would also work with my 944. I hoped that the volvo and the 944 might use a similar thread pattern or fitting where the flex line meets the fuel rail. If possible I will make an adapter that is common to both.

I assume others must be buying perhaps similar fittings, to do the leakdown test. if the guage can be connected while the car is driven you can check for fuel starvation by driving hard up a hill and if there is a pressure drop it indicates fuel starvation, maybe a plugged filter or similar.

if it leaks down it can be a sign that the fuel pump check valve is bad or one of the injectors isnt' shutting off , the latter can cause a puff of white smoke as the gas evacuates as you drive the first few blocks with 1 cylinder flooded.

im not so familiar with this sytem with the fuel distributor. I once had a volvo that used a similar system. it worked well. i felt that the abscence of complex electronics made it more reliable.

ive ye to see any kit for the early 944's that are complete but likley you can get all the parts. I wondered if you might consider building a kit for those who want to upgrade the whole 944 system in one purchase.

without getting political It seems there is some uncertainty around the procurement of affordable aftermarket parts as so many were traditionally made offshore and many restoreres are relying on them.

from my seat I figure I have enough of most parts to go ahead and keep myself occupied, but Id like to start with a new fuel system, I got the pump and filter bit not the fittings yet.

so Ive been hoping to do more and basically use up every part Ive bought beofore digging in too much deeper. maybe things will level out economically, here's hope for that.


I hope your venture is successful.

[Project9241979]

To my knowledge the Porsche 944 uses a fuel rail and also no K-jet ignition system. The fuel lines running to the will be much bigger then the lines I am talking about. The lines I am talking about have an inner diameter of just 1.6mm.

I am just focussing on 924 fuel lines at the moment, but will keep this in mind for a future project.

[djnolan]

Seems like it has possibilities. Have you checked out 924.org ?

[Project9241979]

Yes, I posted there aswell. People are intrested, but not much more.