S2000 Under The Hood S2000 Technical and Mechanical discussions.

Petrol/Gas strong smell!

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Old 07-25-2018, 09:28 PM
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Default Petrol/Gas strong smell!

Hi everyone! I need a little help here. We went for a drive on the highest road in Slovenia (Mangart) and when i reached the top i smelled petrol/gas....raw gasoline behind the car. I stopped and inspected the situation. No in-car smell, no smell in the trunk, only on the left rear side of the car under wheel well. Almost no smel around gas cap but the smell was all over the place so i couldnt tell 100% it wasnt from the cap. I oppened tha cap and alot of pressure went out and when i looked inside it looked like the gas was boiling :/. Anyway this happened last year on the same road. Slow climbing in second and first gear.

Gas cap is ok, the seal is like new and i have no CEL. Car runs fine.

Did this happen to anyone else? Mybe its the elevation or something..... We drove in a group of cars.....2 other cars also had similar problem (mazda mx5)

S2000 AP1 year 2000
New engine (block assy 2009 f20c)
Burns 0 oil.
Passes emissions with no problem.
Fuel consumption is normal.
Old 07-26-2018, 02:16 AM
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Since other cars also had the "problem" it could just be because of elevation.
Old 07-26-2018, 02:54 AM
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Was your gas tank close to full when you started the journey?
When you fill your car at the gas station do you stop filling on the first click, or do you top it up a couple of times more? (do not do this)
Sounds like your EVAP canister (also called charcoal canister) is saturated and can't keep up absorbing the added fuel fumes created at the lower atmospheric pressure (2072m above the sea).
I think the only real solution is to replace the EVAP can.
Old 07-26-2018, 06:12 AM
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Perhaps over-filling? Easy to test: Try the same road with half a tank of gas next time.

-- Chuck
Old 07-26-2018, 11:52 AM
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Check to see if the oil cap is secured.
Old 07-26-2018, 01:04 PM
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Originally Posted by cdelena
Check to see if the oil cap is secured.
Yeah, and check the cap on all the tire valves too. That would have a similar effect on this situation as the oil cap...
Old 07-26-2018, 09:52 PM
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Originally Posted by flanders
Was your gas tank close to full when you started the journey?
When you fill your car at the gas station do you stop filling on the first click, or do you top it up a couple of times more? (do not do this)
Sounds like your EVAP canister (also called charcoal canister) is saturated and can't keep up absorbing the added fuel fumes created at the lower atmospheric pressure (2072m above the sea).
I think the only real solution is to replace the EVAP can.
Gas tank was at 1/3, i always turn the cap 4-8 clicks. and this only happens on this road haha ....... Can the exhaust head up the gas that much to cause this? i have a custom aftermarket exhaust.
Old 07-26-2018, 09:53 PM
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Originally Posted by Chuck S
Perhaps over-filling? Easy to test: Try the same road with half a tank of gas next time.

-- Chuck
tanks was on 1/3 ..... im gonna try again next month and drive it little faster just to try.....
Old 07-26-2018, 09:54 PM
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Originally Posted by Car Analogy
Yeah, and check the cap on all the tire valves too. That would have a similar effect on this situation as the oil cap...
Please tell me this is just you making fun of the early post hahaha "Yeah, and check the cap on all the tire valves too."
Old 07-26-2018, 09:57 PM
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Theres nothing wrong with the car so the only problem i can see is evap canister....no leaks no nothing ..... it doesnt bother me that much its just embarrassing


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