924Board.org

[Meneer aard]

I have a small problem with my car, first of all yesterday she runs great, and today (moved a couple of meters) and after 30 mins i started the car again, running afwul (3 cylinders), inspection at the injection, timing and ignition nothing wrong.

After the inspection i noticed a leak from the fuel line that runs from the fuel filter (top) to the CIS..(see pics). My question: wich hose can i choose to fix this leak (i would rather replace the complete line (at the picture black).




thanks in advice.
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Porsche 924 Euro 1977

[Chrenan]

I have some 8mm (I think that is the size) rubber fuel hose between the fuel filter and the distributor, held on with hose clamps. It has never leaked or come loose, total cost less than $10.
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1987 951 - M193 Version for Japan

[Meneer aard]

Thnx, the problem is fixed. I bought a piece of fuel hose and 2 hose clamps and the leak is no more

She runs fine on all the cylinders.
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Porsche 924 Euro 1977

[Smoothie]

I think that section is under about 90+ psi (whatever the fuel pumps' relief valve limits to), so I'd rate the rubber line fix as at least slightly risky and now add you to my night-time prayers - "God bless mommy, and daddy, and Chrenans' fuel filter to fuel distributor hose and clamps, and Meneer aards' fuel filter to fuel distributor hose and clamps...". Well, you can see my prayers are getting lengthy.. -So if too many more of you do this, I won't get any sleep.

I'd at least try to get the correct stuff. It's high pressure fuel injector line, made of some kind of plastic. If/when you find it (correct internal diameter is critical because as you can see, it's just a push-on fit over the barbed fitting), don't cut the old line off so as to avoid damaging the barbs - heat the old line and pull it off. Then do not heat the new line - just push it on at room temp (if doing it in cold weather, warming it with your hands should be ok).
Also, the high pressure plastic line is often covered with rubber for protection/insulation, so you can slip a piece of rubber line over it to accomplish the same thing.
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"..it's made in Germany. You know the Germans always make good stuff."


'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

[Meneer aard]

Smoothie, this is just low pressure? Because its comming out from fuel pump and at the back they just used the same material hose.

But i see it also as a "emergency repair" I think i go for good fuel lines (stainless steel covered lines?
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Porsche 924 Euro 1977

[Lizard]

No Smoothie is right, that is a HIGH pressure hose.

You can use rubber fuel hose, but it needs to be rated for 100 PSI or greater. NOTHING LESS.
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3 928s,

[Chrenan]

The hose I use is fuel injection line, it is actually printed on the hose as such, safety first. I agree it is not ideal, but it hasn't gone wrong yet and both my pumps are new so they are developing the appropriate PSI. Nevertheless, keep me in your prayers, I appreciate it.
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1987 951 - M193 Version for Japan

[Meneer aard]

On the internet i see at the site of Gates (manufactor of the hose) that the type hose that i used, is good for 180 PSI (arround 12 bar).

Just like Chreanan its an fuel injection line.
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Porsche 924 Euro 1977

[Min]

the hose you need is EFI high pressure hose, rated 30r9 or better. Its got a running pressure of 100psi and a burst pressure of 900 psi (apparently) It will easily take all the CIS pump can provide pressurewise. Make sure you use proper EFI clamps on the hose rather than regular wormgear clamps, EFI clamps are designed not to tear the hosing at all like wormgear clamps do. If your going to take this route, do it properly so smoothie can sleep at night.

Min
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Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.

[Meneer aard]

Check and dubble check. So Smoothie can sleep now at night The clamps are new and i only used these clamps. Other clamps are junk.

How does Porsche explain the steel lines from the fuel distributor to the injectors? Because in the middle of these lines are made out of a kind sort of plastic??

On the 924 are 2 versions of lines, steel lines and some sort of steel covered lines but flexibel (like stainless steel covered brake lines).
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Porsche 924 Euro 1977

[Nobbi]

Hallo,

back in germany this fuel-lines are called/named "TECAL-Leitungen".
Those metal-covered lines are standard for 1976 and 1977 years.Not just for connecting filter and cis, also from cis to fuel injectors.
They are still available at your local porsche dealer.

Nobbi

[Meneer aard]

Thnx Nobbi, so the system (with metal lines) is not original? It looks great under the hood when everything is cleaned.

I have one question about the pressure in the hose..In the Haynes manual they say that the fuel delivery must be arround 0,5 liters every 30 seconds (i have arround 25 seconds 0,75 liters). How high is this pressure? I can`t imagine that the pressure would be 180 PSI (arround 12 bar).

The injectors working at a pressure of arround 3,3 bar to open. I can`t find any more information in the offcial workshop manual (porsche, not haynes) and the official K-jet manual from Bosch.

edit: Today i drove arround 120 km (arround? 75? miles) and runs great, no leaks.
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Porsche 924 Euro 1977

[RC]

Meneer aard wrote:

[blargonator]

speaking of fuel line, can i run plain jane fuel hose pre-fuel pump?

Edit~ my 76 has flexible lines steel braided lines unlike the ones in the picture, as from the filter, and to the injectors. not original i take it?

[Meneer aard]