Carl Fausett

This is typical of the condition of the fuel injector hoses on most 1980-1984 L-Jet equipped Porsche 928’s.

The hoses are embrittled, cracked, and dangerous.

Fortunately, replacing them is not that hard. We sell the correct metric fuel hose for this application.

Carl Fausett

Remove your fuel injector rails and lay them on your workbench.

Carl Fausett

Cut the old injector fuel hose in half near the center. Then split it down the center. If you use a hawk’s bill shaped razor knife like this one, you can cut all the way down into the ferrule and also not scratch the injector on the back-side.

Carl Fausett

The old hose will come off like this...

Note it has no liner, and the cracks do also appear on the inside.

Carl Fausett

Now take your new fuel hose and slice it into 8 sections, each 50mm long.

Carl Fausett

Assembly is easy. A little Dawn Blue Dish-washing Liquid on the barbs will make the hoses slide on easy.

We like to lay the fuel rail on the bench so we can push down onto it. Add a ferrule, a hose, the other ferrule, then the injector.

Carl Fausett

All done, ready to put back on the car.

AS ALWAYS, CHECK FOR LEAKS AFTER SERVICING ANY PART OF THE FUEL SYSTEM

Mrmerlin

Nice tutorial.

FWIW if your going to take the time to swap out the hoses,
you should also consider sending the injectors off to a Witchhunter for cleaning and inspection ,
also order the new upper and lower injector rubber seals .
NOTE not all lower seals are the same,
I found some that have round edges and seem to fit better in the bore than the flat sided seals.

I also suggest to use some DC 111 on all of the rubber seals.

New upper rubbers are necessary, to restore the crush that they provide,
This will enhance the lower seal pressure

Make sure to inspect these hoses when the temps drop to below freezing ,
as the new barrier hose may not be malleable enough to prevent fuel leaks.

AirtekHVAC

Nice...thanks Carl, and you too For the input Stan....this is in my future with the new 2 me 82.

yaskota

Mahalo Carl & Stan!

Saving this and putting parts on my shopping list!

Carl Fausett

Yes! Yes! New o-rings and seals for sure. Good catch. I will add that to my instructions.

j.kenzie@sbcglobal.net

Hi Stan,
You mentioned "barrier hose" in your post. Not sure that is what we have here. I think it's just plain, good rubber with fiber reinforcement.
I could be wrong.
Also what hose should be used? I obtained the German fuel hose that Greg recommends #N 020 281 1. It is 7mm I.D. x 13mm O.D.
Thanks,
Dave

Daniel5691

This is very informative and useful.
Thanks so much for taking the time to photograph and post for us.
Dan

Jetdriver69

If you send the injectors off to Witch Hunters, they will install new hoses and clamps for just a few dollars each.

It was worth it to me.

ROG100

Gates Barrier hose is good to -40F and far better than the standard older EFI spec hose. Unfortunately the old spec EFI hose is not compatible with the **** (ethanol is just one additive) they put in our gas these days and will deteriorate faster than normal. Make sure you check the hoses on an annual basis and we recommend using EFI clamps as well as the hats as Porsche does in their hose kits.
Nice tutorial Carl.