Replacement Fuel Hoses 85 to 95
04-11-2007 | 07:43 PM
#1
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From: Double Oak, TX
Replacement Fuel Hoses 85 to 95
With due respect to Carl's original thread on this subject I have started this new thread to discuss the topic further.
I believe I have a solution for the infamous U hose on the 85 to 95 cars.
There are two different designs - one for the 85 & 86 and possibly some early 87 cars and the other 87 to 95.
The 85 & 86 design is easy to replace using standard 5/16" ID EFI hose and EFI clamps. This is because the hose has a large bend radius.
In 87 the design changed such that the hose length became smaller due to space restrictions and the bend rad tightened to 26mm.
I have a potential solution which can be seen in the attached pictures.
I need to pressure test the assembly to 3 x working pressure and to destruction to satisfy myself it is good.
If I am successful I envisage a price of about $16 for this hose and will add it to my kit for those who wish to purchase it.
Thanks to everyone who contributed to the project.
I believe I have a solution for the infamous U hose on the 85 to 95 cars.
There are two different designs - one for the 85 & 86 and possibly some early 87 cars and the other 87 to 95.
The 85 & 86 design is easy to replace using standard 5/16" ID EFI hose and EFI clamps. This is because the hose has a large bend radius.
In 87 the design changed such that the hose length became smaller due to space restrictions and the bend rad tightened to 26mm.
I have a potential solution which can be seen in the attached pictures.
I need to pressure test the assembly to 3 x working pressure and to destruction to satisfy myself it is good.
If I am successful I envisage a price of about $16 for this hose and will add it to my kit for those who wish to purchase it.
Thanks to everyone who contributed to the project.
__________________
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."
04-11-2007 | 08:48 PM
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From: Double Oak, TX
Hi Malcolm,
Not quite sure what you are asking?
This is a special hose because it is preformed to the specific bend rad.
It is EFI hose in its own right.
You are on the list.
Roger
Not quite sure what you are asking?
This is a special hose because it is preformed to the specific bend rad.
It is EFI hose in its own right.
You are on the list.
Roger
04-11-2007 | 09:25 PM
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From: DFW Texas
Hi Roger,
Put me down for one also. We've lost to many good 928's due to fires from bad hoses. My car is now 14 years old yet it's newer than alot of other 928's, but I'm not taking any chances. I have too much invested in this car, both emotionally and financially .
Jim Mayzurk
93 GTS 5-spd
Put me down for one also. We've lost to many good 928's due to fires from bad hoses. My car is now 14 years old yet it's newer than alot of other 928's, but I'm not taking any chances. I have too much invested in this car, both emotionally and financially .
Jim Mayzurk
93 GTS 5-spd
04-11-2007 | 09:29 PM
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From: Southern Alberta, Canada
Originally Posted by ROG100
Hi Malcolm,
Not quite sure what you are asking?
This is a special hose because it is preformed to the specific bend rad.
It is EFI hose in its own right.
You are on the list.
Roger
Not quite sure what you are asking?
This is a special hose because it is preformed to the specific bend rad.
It is EFI hose in its own right.
You are on the list.
Roger
My exisiting EFI line is preformed also; in a straight line
Any ETA when the new hose will be ready for sale?
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04-15-2007 | 10:20 PM
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From: Double Oak, TX
Fortunatly I work weekends but my friendly hose store does not.
Should have some numbers on Tuesday if all goes well and I get my taxes done in time 8>)
Should have some numbers on Tuesday if all goes well and I get my taxes done in time 8>)
05-06-2007 | 03:47 PM
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From: Madrid, Espaņa
Here is the translated version from the German www.pff-online.de
Excuse my English. If you find any mistakes, please keep them
A well known problem with aging Sharks are rubber fuel lines. I didn't want to wait until I had a real leak at the well known spots and decided to change the lat original rubber fuel line. I'm talking about the line between pulsation damper and pressure regulator. Between MAJ 85 and 86 the fuel line looked like this:
Exchanging was easy for this line. A standard rubber fuel line could be used. But only on 85 to 86 models.
As of MJ 87 Porsche changed the design of the fuel line and decreased the diameter significantly. A simple exchange was not possible anymore, the inner diameter of the hose is getting to small when you bend the hose:
The problem with an aging fuel line is the following: You never see the line, but it is exposed to a lot of stress. Especially heat. The hose gets brittle and shrinks, the result is a leak, sooner or later. If this happens during high outside temperatures or on the Autobahn the disaster can't be prevented anymore:
The fuel line is made out of two metal parts and is connected via a hard plastic fuel line. The plastic fuel line is protected by a rubber hose. The factory uses NO Clamps on their design!
My friend Roger found a manufacturer in the USA that makes the line to his specifications. He uses a pre-formed reinforced fuel line. He sold many kits in the USA with great results. I ordered a kit and my shark "volunteered" again as a european guinea pig
Installations takes about 45 minutes and is very easy. When I took my old hose apart it showed signs of aging. It fell apart.
On assembly use some Vaseline before you push the hose on the metal fitting. Position the clamps but don't tighten them. Assemble everything in reverse order. Tighten the metal fitting back on the regulator and damper. Finally tighten the EFI clamps. This way you don't put any tension on the new rubber fuel hose. Looks very good and is better than original (my opinion). BTW a new fuel line from Porsche costs 50 Euros, this is a bargain!
Excuse my English. If you find any mistakes, please keep them
A well known problem with aging Sharks are rubber fuel lines. I didn't want to wait until I had a real leak at the well known spots and decided to change the lat original rubber fuel line. I'm talking about the line between pulsation damper and pressure regulator. Between MAJ 85 and 86 the fuel line looked like this:
Exchanging was easy for this line. A standard rubber fuel line could be used. But only on 85 to 86 models.
As of MJ 87 Porsche changed the design of the fuel line and decreased the diameter significantly. A simple exchange was not possible anymore, the inner diameter of the hose is getting to small when you bend the hose:
The problem with an aging fuel line is the following: You never see the line, but it is exposed to a lot of stress. Especially heat. The hose gets brittle and shrinks, the result is a leak, sooner or later. If this happens during high outside temperatures or on the Autobahn the disaster can't be prevented anymore:
The fuel line is made out of two metal parts and is connected via a hard plastic fuel line. The plastic fuel line is protected by a rubber hose. The factory uses NO Clamps on their design!
My friend Roger found a manufacturer in the USA that makes the line to his specifications. He uses a pre-formed reinforced fuel line. He sold many kits in the USA with great results. I ordered a kit and my shark "volunteered" again as a european guinea pig
Installations takes about 45 minutes and is very easy. When I took my old hose apart it showed signs of aging. It fell apart.
On assembly use some Vaseline before you push the hose on the metal fitting. Position the clamps but don't tighten them. Assemble everything in reverse order. Tighten the metal fitting back on the regulator and damper. Finally tighten the EFI clamps. This way you don't put any tension on the new rubber fuel hose. Looks very good and is better than original (my opinion). BTW a new fuel line from Porsche costs 50 Euros, this is a bargain!
05-06-2007 | 05:09 PM
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I have viewed this with great interest. Is it possible to have a bigger pic showing where in the engine bay this hose is located?
Rog, do you accept paypal? Mine is a Euro 4.7 (S2) does this pipe fit, or will I need to fabricate one myself?
Anyway, even if your pipe does not fit, I will be doing this mod ASAP. A big engine fire is not a nice thought. Especially as I've just replaced all the fuel lines from the middle of the car backwards.
Rog, do you accept paypal? Mine is a Euro 4.7 (S2) does this pipe fit, or will I need to fabricate one myself?
Anyway, even if your pipe does not fit, I will be doing this mod ASAP. A big engine fire is not a nice thought. Especially as I've just replaced all the fuel lines from the middle of the car backwards.
05-06-2007 | 05:31 PM
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From: Madrid, Espaņa
The big black round opening in the last picture (bottom right corner), is for the MAF. This is the view after you remove the lower air filter housing and the MAF. Sorry I don't have a bigger picture.