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Discussion Starter #1
Hi

I'm a newbie to the forum but have read loads of helpful posts on other issues.

My current problem is a strong fuel smell in an 2010 Exige S240. I have had the car since March and there was no fuel smell at all when the car was bought.

Having read through various posts and it being in local lotus specialist 3 times I have ruled out these possible sources of fuel smell.

No exhaust leaks, all bolts checked and nice and tight.

New filler cap in case that was leaking

Fuel lines traced and no obvious sources of leaks. Injectors also checked for leaks.

Charcoal canister checked, purge solenoid works correctly.

Fuel pressure regulator is fine

The smell is noticeable whether windows are open or closed, but smell is much worse with them open (it doesn't seem to make any difference whether one window are both are open. smell is at it worst at high revs

Any help or ideas would be great fully appreciated.

Other than the smell. Love the car
 

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Nein Kinder
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My current problem is a strong fuel smell in an 2010 Exige S240.
No expert, but here are a few things I'd try...

Find an emissions/smog station willing to use a hydrocarbon sniffer and check the accessible fuel system components with the car hot. You want to keep any residual pressure in the fuel tank, so don't crack the gas filler cap open.

I have an Elise, but I'm pretty sure the Exige also has a quick disconnect (orange and gray plastic) about 4' back from the fuel rail - check that out.

Here's an owner that found vapors being pulled in his sills.

Use a search string like this in Google to search for more suggestions:

site:lotustalk.com fuel smell

Good luck...

Glen
 

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Check the fuel lines near/under the airbox. I have the cup airbox and it was rubbing against a fuel line which eventually created a hole in the line from the friction. I had a pretty severe fuel leak and had to tow it as I was losing fuel quickly. Check that area
 

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Discussion Starter #4
Check the fuel lines near/under the airbox. I have the cup airbox and it was rubbing against a fuel line which eventually created a hole in the line from the friction. I had a pretty severe fuel leak and had to tow it as I was losing fuel quickly. Check that area
Cheers for reply. It does have the cup airbox but i have checked underneath in that area and all appears ok. the fuel line also has a protective cover around it as it passes that area.. does yours have the same cover

Also, when the engine is off there is no fuel smell. i have had my mrs sat in the car priming the fuel system while i have my head in that area with the wheel and arch liner off and cant see, smell or feel any wet patches at all.. I will check it again though just in case i missed anything..

The only thing i can think of is that the leak is coming from where the fuel pump is attached to the tank or where the fuel line attaches to the fuel pump. as that area is pretty inaccessible but my logic is that if it was there then i would smell it when the engine was off or all of the time..
 

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If you can't smell it when the fuel system is *only* pressurized then I would say its either coming from after the injectors (going through the engine) or related to Purge/Evap system. The Purge/Evap only functions at idle I believe though, and at high RPM is when your engine is going to be burning the most amount of fuel (or unburning :) ). It may just be a weird thing with the way the wind is catching the exhuast. Take note of the wind direction or strength of wind if you can.

My car has lots of smells. Exhuast, Clutch, hot air. Its not a "pleasant" car to drive :D
 

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Discussion Starter #6
If you can't smell it when the fuel system is *only* pressurized then I would say its either coming from after the injectors (going through the engine) or related to Purge/Evap system. The Purge/Evap only functions at idle I believe though, and at high RPM is when your engine is going to be burning the most amount of fuel (or unburning :) ). It may just be a weird thing with the way the wind is catching the exhuast. Take note of the wind direction or strength of wind if you can.

My car has lots of smells. Exhuast, Clutch, hot air. Its not a "pleasant" car to drive :D
All of the injectors have been inspected for signs of leaks and they all look ok..

if the car had done it from day one then i would be able to accept it as normal but seeing as its came on over the last few weeks then i know something has changed.. the purge solenoid has been checked and is functioning.. one possible cause although i suspect very unlikely but any views are appreciated. I polished the car with a meguiars G220 polisher (the dual action rotary one) and this causes a lot of vibration to the bodywork and car. do you think theres any chance this has disturbed or ruined the charcoal filter in any way?

Cheers
 

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Gamera The Atomic Turtle
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sorry if i missed it in your initial description, but you do have a catalytic converter in the exhaust chain, correct? If not - that's probably the cause of the smell.
 

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Discussion Starter #9
sorry if i missed it in your initial description, but you do have a catalytic converter in the exhaust chain, correct? If not - that's probably the cause of the smell.
Hi

Yeah. Apart fom cup airbox and stage 3 back box the car is standard.

Cheers
 

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Nein Kinder
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Should the filler Cap hiss when removed.. Mine doesn't.
The gas cap should seal vapor in. It will hiss based on whether or not pressure built up in the tank. I seem to get the most pressure build-up after extended steady-state running, like cruising down the highway. I presume this results from a large amount of (warmed) excess fuel being returned to the tank.

My Porsche once had the fuel-vapor-in-the-cockpit curse. I finally traced it to very tiny cracks in the large-diameter rubber line that connected the metal fuel filler to the gas tank. The rubber line passed through the exterior panel then passenger compartment on its way to the gas tank: the tiny cracks allowed pressurized vapor to escape into the passenger compartment. The cracks were not visible unless I deformed the rubber, and the rubber was not very old. I presume it was a defective manufacture - replacing the part cured the problem.

GD
 

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Discussion Starter #11
Cheers for reply.

Its really baffling me now.. If its a damaged hose or breather for the petrol tank then im guessing i would smell it all of the time. but its pretty much only under hard acceleration which is making me think its something to do with fuel pump or fuel line as these will be working hardest at high revs.

does anyone know the sequence for the evaporative / charcoal canister system. i.e. when the purge gets activated. if its at high revs then that might lead me towards thinking its that again, although the purge solenoid has been checked but a line could be blocked?
 
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