OB fuel injection question
12-11-2007, 04:02 AM
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OB fuel injection question
Well guys it's been cold and icy here for the last few days. Driving home in my 81 OB tonight I was almost home and I started smelling gas. I thought it was just in the air until I got out and it was very strong around my car. I popped the hood and found one of the short rubber hoses that feed my fuel injectors from the fuel rail leaking. I looked at them before the 3rd coast and they were very hard and needed to be changed according to Russ. Well I guess he was right so here's my question. Is there anything special to changing these hoses? Do I just lift the fuel rail up and remove and replace the little hose sections? I've been told that it needs to be fuel injection hose. Does that sound correct? Does anyone know of a tutorial on doing this job? Thanks for the help guys you are the best
Jason
Jason
12-11-2007, 04:43 PM
#2
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An OB with L-jet? yes the hoses need to be suitable for Injection pressures (~40psi), and I am sure somebody who has done it will chime in. Clips that wont cut into the hose are worth looking for.
jp 83 Euro S AT 51k
jp 83 Euro S AT 51k
12-11-2007, 04:53 PM
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If you have the same set up as I do, that is L-jet, then I have found it easier to just pull all four out with the fuel rail, put new o-rings on (like 5 bux for a side) and re-do the whole thing at once, on the bench. you do want to get the proper fuel injection rated hose, and the proper fuel injection hose clamps, very common parts at any local parts store. Pretty easy job, some have said that the lower o-rings stuck, I did not have that problem, but I only have 205K miles, so mine may have still been factory fresh.
12-11-2007, 05:31 PM
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Yes it's L-jet according to Russ. Looking at it last night I don't recall seeing clips on the hoses. Do they look like hose clamps or something else? Jason
12-11-2007, 05:33 PM
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12-11-2007, 05:34 PM
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If you have the same set up as I do, that is L-jet, then I have found it easier to just pull all four out with the fuel rail, put new o-rings on (like 5 bux for a side) and re-do the whole thing at once, on the bench. you do want to get the proper fuel injection rated hose, and the proper fuel injection hose clamps, very common parts at any local parts store. Pretty easy job, some have said that the lower o-rings stuck, I did not have that problem, but I only have 205K miles, so mine may have still been factory fresh.
But I'm sure my neglected Ebay car is in much worse shape despite the low miles. Jason
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12-11-2007, 06:41 PM
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short inj hoses
Some will argue different, but in my experience, you don't need clamps, the rail & the injector are barbed, and what LOOK like compression rings are just decorative. When I did my '80 last spring, I had to grind off the metal "compression rings", then use a wire wheel to abrade the remains of the hoses off of the barbs. Standard injection rated line is fine ~5/16" IIRC. Pull injector rails & injectors together & replace all really is best/easiest.
You should consider replacing the feed & return hoses on the pass. side as well, since they are likely the same age. They are pricey, and a total b14tch to remove if original & untouched.
WYAIT....vac hoses, coolant hoses, oil/intake hoses, heater hoses.....................>>>>>>>>>>
Ken
You should consider replacing the feed & return hoses on the pass. side as well, since they are likely the same age. They are pricey, and a total b14tch to remove if original & untouched.
WYAIT....vac hoses, coolant hoses, oil/intake hoses, heater hoses.....................>>>>>>>>>>
Ken
12-11-2007, 06:42 PM
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I've done this a few times now. The factory holders for the fuel hose it a bitch to remove. I use a small hack saw to cut away the small bowl shape holder on each end.
There are two seals on each injector - replace all of those (one of each of these per injector:
http://www.mailordercentral.com/928i...0133%20261%20A
http://www.mailordercentral.com/928i...11%20133%20263
928 International also sells this kit:
http://www.mailordercentral.com/928i...110%20903%2000
The only part I do not like about this kit is the use of the bowl shaped hose holder. The clamps in that picture (norma band clamps) I use 16 of those, one on each end of the hose versus using the types of clamps the factory uses.
Since you are taking off the rails anyway - replace the two short hose pieces going to the fuel pressure regulators. Same type of hose, same age as the one leaking on your injector.
There are two seals on each injector - replace all of those (one of each of these per injector:
http://www.mailordercentral.com/928i...0133%20261%20A
http://www.mailordercentral.com/928i...11%20133%20263
928 International also sells this kit:
http://www.mailordercentral.com/928i...110%20903%2000
The only part I do not like about this kit is the use of the bowl shaped hose holder. The clamps in that picture (norma band clamps) I use 16 of those, one on each end of the hose versus using the types of clamps the factory uses.
Since you are taking off the rails anyway - replace the two short hose pieces going to the fuel pressure regulators. Same type of hose, same age as the one leaking on your injector.
12-11-2007, 09:32 PM
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Jason,
I have all the hose and clamps and seals you will need for a lot less money.
Other than that do as Erik says.
Roger
I have all the hose and clamps and seals you will need for a lot less money.
Other than that do as Erik says.
Roger
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
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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."
12-12-2007, 12:03 AM
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Some will argue different, but in my experience, you don't need clamps, the rail & the injector are barbed, and what LOOK like compression rings are just decorative. When I did my '80 last spring, I had to grind off the metal "compression rings", then use a wire wheel to abrade the remains of the hoses off of the barbs. Standard injection rated line is fine ~5/16" IIRC. Pull injector rails & injectors together & replace all really is best/easiest.
You should consider replacing the feed & return hoses on the pass. side as well, since they are likely the same age. They are pricey, and a total b14tch to remove if original & untouched.
WYAIT....vac hoses, coolant hoses, oil/intake hoses, heater hoses.....................>>>>>>>>>>
Ken
You should consider replacing the feed & return hoses on the pass. side as well, since they are likely the same age. They are pricey, and a total b14tch to remove if original & untouched.
WYAIT....vac hoses, coolant hoses, oil/intake hoses, heater hoses.....................>>>>>>>>>>
Ken
I'll definately change everything hose related on the motor while I'm at it. I'm with you everything is pretty well toast if it's original like the fuel injection hoses. Jason
12-12-2007, 12:06 AM
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12-12-2007, 12:08 AM
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Some will argue different, but in my experience, you don't need clamps, the rail & the injector are barbed, and what LOOK like compression rings are just decorative. When I did my '80 last spring, I had to grind off the metal "compression rings", then use a wire wheel to abrade the remains of the hoses off of the barbs. Standard injection rated line is fine ~5/16" IIRC. Pull injector rails & injectors together & replace all really is best/easiest.
You should consider replacing the feed & return hoses on the pass. side as well, since they are likely the same age. They are pricey, and a total b14tch to remove if original & untouched.
WYAIT....vac hoses, coolant hoses, oil/intake hoses, heater hoses.....................>>>>>>>>>>
Ken
You should consider replacing the feed & return hoses on the pass. side as well, since they are likely the same age. They are pricey, and a total b14tch to remove if original & untouched.
WYAIT....vac hoses, coolant hoses, oil/intake hoses, heater hoses.....................>>>>>>>>>>
Ken
12-12-2007, 04:45 PM
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Just the injector hoses should take no more than a couple of hours for an (non-928) experienced DIY'er, less than 1 hour for those with 928/prior experience.
YMMV
Ken
more info here in my old post:
https://rennlist.com/forums/928-forum/349586-1980-intake-r-and-r-lotta-work-but-success.html
YMMV
Ken
more info here in my old post:
https://rennlist.com/forums/928-forum/349586-1980-intake-r-and-r-lotta-work-but-success.html
Last edited by kjurkic; 12-12-2007 at 04:58 PM. Reason: link added