Fuel supply and return hoses on 1986 US Spider - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 8 (permalink) Old 04-02-2019, 08:53 PM Thread Starter
Lew
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Question Fuel supply and return hoses on 1986 US Spider

Hey everybody,

Finally getting around to replacing the 7.5 mm fuel supply and return hoses on the 1986 Spider. (Already replaced the fuel rail to injector lines). I'm trying to keep the hose as close to original as possible. The supply and return lines have been replaced once already, so are not the originals. Does anyone know what manufacturer and style/model fuel line was used for the supply and return lines in a 1986 US car? Was it the cloth braided fuel line like this that was typical in other parts of the fuel system in the 1986?

https://www.belmetric.com/braided-me...mm-p-8316.html

(I'm not familiar with Cohline, but I don't buy fuel hose every day).

I understand that the supply side needs to be "fuel injection" pressure rated (but that the return doesn't necessarily). Got it. However, were the supply and return hoses the same on a stock car?

I run only ethanol-free gas in the car, so I'm not necessarily concerned with finding a modern type of hose that's protected from ethanol, etc. Would be a bonus, but not as much of a base requirement as trying to stay with original.

Answers and thought are appreciated.

Thanks,

Lew
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post #2 of 8 (permalink) Old 04-02-2019, 11:57 PM
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this might help

https://www.alfabb.com/bb/forums/865737-post6.html

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #3 of 8 (permalink) Old 04-03-2019, 09:19 AM Thread Starter
Lew
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That's helpful! I was headed down the wrong path with 7.5mm ID. Thanks!

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post #4 of 8 (permalink) Old 04-03-2019, 01:53 PM
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From what I've seen, the 7.5 hose is pretty much unobtanium!!! I suspect 1.5 feet is enough to do the injectors. Where did you get yours? Thanks Paul
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post #5 of 8 (permalink) Old 04-03-2019, 01:56 PM Thread Starter
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From what I've seen, the 7.5 hose is pretty much unobtanium!!! I suspect 1.5 feet is enough to do the injectors. Where did you get yours? Thanks Paul
Centerline sells the 7.5 mm in a pre-cut injector kit.

https://centerlinealfa.com/catalog/f...tor-repair-kit

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post #6 of 8 (permalink) Old 04-03-2019, 02:23 PM
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I would suggest using fuel injector rated hose on both the supply and return lines. It's not that much hose overall since you're just connecting the metal sections.

Unless you're wedded to the idea of the original hose for some reason, just pick up some off-the-shelf fuel hose: the fabric hoses make it hard to evaluate the condition of the rubber and I don't like them for that reason. 8mm is pretty much the same as 5/16" (7.94mm) and I think the FI hose I bought at the local auto parts store was labeled as both.

Any modern hose should be rated for ethanol, but you should ensure you're using ethanol-resistant hose regardless of what you're putting in the tank.

Tom

1963 Giulia Spider (1750 engine)
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post #7 of 8 (permalink) Old 04-03-2019, 03:10 PM Thread Starter
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Originally Posted by Gubi View Post
I would suggest using fuel injector rated hose on both the supply and return lines. It's not that much hose overall since you're just connecting the metal sections.

Unless you're wedded to the idea of the original hose for some reason, just pick up some off-the-shelf fuel hose: the fabric hoses make it hard to evaluate the condition of the rubber and I don't like them for that reason. 8mm is pretty much the same as 5/16" (7.94mm) and I think the FI hose I bought at the local auto parts store was labeled as both.

Any modern hose should be rated for ethanol, but you should ensure you're using ethanol-resistant hose regardless of what you're putting in the tank.
Thanks Gubi. This makes sense. Will probably go this route. I was just trying to keep things as original as possible, but you're right about the fabric obscuring deterioration (dangerously, as many of our members have recounted).

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post #8 of 8 (permalink) Old 04-03-2019, 08:03 PM
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They originally came with the rubber high pressure hose on the supply side which would be the fuel end closest to the firewall. the return hose is standard cloth braided fuel line. As it is just a return line that is not high pressure.

1969 1750 Spider Veloce w/dual webers, 1969 1750 Berlina, 1971 1750 Spider Veloce w/ dual webers, 1985 Spider Veloce 23,000 orig. miles, {Two} 1986 Spider Veloces, 1987 Spider Veloce bought new, 1988 Quadrifoglio, 1991 164S, Plus several more. I think they are breeding.
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