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94 850 - smell of gas from engine and heater

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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ir637113
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Year and Model: 94 850 NA Wagon
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94 850 - smell of gas from engine and heater

Post by ir637113 »

Hey guys,

Was working on some minor repairs on my 850 wagon (replaced a LOT of vacuum hoses, including from the charcoal canister behind the manifold) and finished last night. Driving it today, I noticed a gas smell coming from the heater, and a co-worker told me it smelled like gas in the engine when they walked by. Haven't checked the fuel injector seals yet, but I'm wondering what some common causes are (i also read it could be from the charcoal canister lines - any chance I could fix that without taking the manifold off again?)

Any help and insight would be wonderful - I don't do much to my car other than routine stuff (heater core, radiator, starter, etc.) This whole thing with the vacuum lines is about as in depth as I've ever gone with an 850.

Thanks in advance!
ir637113
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Re: 94 850 - smell of gas from engine and heater

Post by ir637113 »

Update - small leak from an injector. The left bolt hole for the fuel rail was a little stripped, and looks like that bolt came loose. Anything I can do other than retapping or helicoiling?
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Re: 94 850 - smell of gas from engine and heater

Post by Ozark Lee »

ir637113 wrote:Update - small leak from an injector. The left bolt hole for the fuel rail was a little stripped, and looks like that bolt came loose. Anything I can do other than retapping or helicoiling?
Short of just replacing the manifold that is about it.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
Jaguar xjs
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Re: 94 850 - smell of gas from engine and heater

Post by Jaguar xjs »

In aluminum I'd use a keen-sert vice a helicoil. A keen-sert will provide more grip in the aluminum. Check McMaster Carr and they have fast and cheap delivery.

Gordon
1996 850 turbo
1994 Jaguar XJS 4.0
1976 Triumph TR6
2012 Scion Xb
ir637113
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Re: 94 850 - smell of gas from engine and heater

Post by ir637113 »

Thanks for the notes, guys. For right now, I'm going with tightening the bolt as much as I can and paying attention to any smells. Haven't had anything since I posted. If the manifold wasn't such a pain and I hadn't taken it apart so recently, I'd pull the mainfold off my broken down 850 and swap them. If it gives me any issues, I can retap or helicoil it when I need to.
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abscate
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Re: 94 850 - smell of gas from engine and heater

Post by abscate »

You could try seating the fuel rail well, maybe with new seals, then applying JB weld to the hole and screwing in the fuel rail screws and letting it set up for a day.

If you get the hole completely clean and degreased, that should hold.You could probably even hold it down tight enough with a ziptie to stop the leak
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ir637113
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Re: 94 850 - smell of gas from engine and heater

Post by ir637113 »

abscate wrote:You could try seating the fuel rail well, maybe with new seals, then applying JB weld to the hole and screwing in the fuel rail screws and letting it set up for a day.

If you get the hole completely clean and degreased, that should hold.You could probably even hold it down tight enough with a ziptie to stop the leak

I debated on doing this originally, and if I was certain I'd never have to change my injectors, I'd go for it. I might try to zip tie fix and see. But I'm not having too much of a problem with just tightening as much as possible and leaving it alone. I don't mind retapping the hole if possible - I've got a buddy who says that it shouldn't be a huge hassle (not as much as changing the hoses from the charcoal canister - THAT was a PITA)
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Re: 94 850 - smell of gas from engine and heater

Post by abscate »

I don't even think the rail really seals the Orings as much as just prevents them from walking out. Orings seal by being an interference fit between the two circular surfaces, not by pressure down, usually.

There is also no fuel pressure on the Orings, they just have to seal from vacuum leaks, if I understand where you are leaking correctly.
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ir637113
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Re: 94 850 - smell of gas from engine and heater

Post by ir637113 »

When the bolt works its way loose, it was leaking from the connection between the rail and the injector. If the bolt is secure, there's no problems. I haven't had an issue the the month-ish since I decided to just tighten it as much as possible and see, but I picked up a metric tap and dye set at an estate sale ($10 for the whole kit - score!), so if it ever becomes an issue, I can give it the proper fix.
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