How to Replace L-Jet Fuel Injector Hoses
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Joined: Dec 2001
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From: Horicon, WI
How to Replace L-Jet Fuel Injector Hoses
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.
The hoses are embrittled, cracked, and dangerous.
Fortunately, replacing them is not that hard. We sell the correct metric fuel hose for this application.
Thread Starter
Developer
Joined: Dec 2001
Posts: 7,005
Likes: 64
From: Horicon, WI
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.
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Joined: Dec 2001
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From: Horicon, WI
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.
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.
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Team Owner
Joined: May 2004
Posts: 31,097
Likes: 4,098
From: Philly PA
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.
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.
Thread Starter
Developer
Joined: Dec 2001
Posts: 7,005
Likes: 64
From: Horicon, WI
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.
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.
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Joined: Jun 2005
Posts: 3,261
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From: Park Ridge, IL (near Chicago)
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
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
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From: Double Oak, TX
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.
Nice tutorial Carl.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."