Gas smell

[timc]

1986 930 3.3 - I smell gas on acceleration and boost. Under normal driving I don't notice any smell whatsoever.

No smog, no cat, all else stock. Timing is also set to specs, and idle is approx 1k. I have not checked CO, but when I changed the plugs and adjusted the valves last week all was OK. I did have the odor on accel and boost before I did the service, and before I removed the smog and cat.

[NathanUK]

Check the small rubber hose that comes from the WUR and goes into the air filter housing assy is not dumping fuel. If it is flowing fuel (it is meant to be just a vent) then your WUR needs to be rebuilt or replaced.

[William930t]

If you have access to a CO or an LM-1 meter, use it to check for rich mixture. Also check all rubber fuel hoses and clamps. How's the fuel mileage?

[timc]

Mileage was approx 14 on last tank, with mixed city,hwy driving. I'll ck the hoses.

[h20cooled7]

i have seen a loose spark plug give a fuel smell
food for thought
pete

[timc]

Originally posted by NathanUK
Check the small rubber hose that comes from the WUR and goes into the air filter housing assy is not dumping fuel. If it is flowing fuel (it is meant to be just a vent) then your WUR needs to be rebuilt or replaced.

I checked the hose, but I am not sure how to determine if it is "bleeding" fuel on acceleration. I did see that it is missing the clamp on the end that attaches to the air cleaner. I assume this hose does carry fuel vapors under normal conditions?

[NathanUK]

It doesn't have a clamp. With the fault I describe, when the engine is running fuel pours out of the hose into the air cleaner.

I think if it was that you would have known when you checked.

[550SPYDER]

have you dismissed that it may be coming from an area from your gas filler to your engine? 1. when you fill up with gas, does your cap release a vacuum when you unscrew it? 2. is there a smell of fuel in the engine compartment or trunk when you lift the bonnets?

[timc]

Good point. I was just thinking about that the other day. When I was low on fuel, did not notice the smell, but when I filled it back up I did. Going to pay more attention to the fuel level as related to the gas smell over the next couple of tanks. See if it goes away as the fuel level decreases.

And going to re ck the CO after I change the muffler out.

Thanks for the repsonse...

tim.