Hoping someone can help solve gas smell

[paulnorwich]

I have a 2015 911 Turbo S. The issue I am experiencing is a smell of gas sometimes when coming to a stop through the vents in the cabin. The smell isnt present when the a/c is set to recycle. but is present whether the air conditioning is on or off. I am no mechanic, but the fumes are being drawn into the car I believe through the fresh air intake. I would be incredibly grateful to anyone else who has experienced this issue and found a solution, it is completely spoiling my enjoyment of the car.

Many thanks in advance.

[Discseven]

Paul... older 911s will eventually have hose and gasket issues. A '15 seems too new for that but who knows. Rather than something rotten I would suspect something "loose." Provided newer 911 fuel runs are like the old, there's the fill, vent, pump, return, and a hole in the tank for the fuel level sender. I had a worn level sender gasket so when the tank was near full, the cabin smelled of fuel due to that gasket leaking. Low fuel in tank... no smell. That leak was not severe enough so fuel could be seen below the car when it was parked. It could easily be spotted by looking around the sender. Am not saying it's the sender gasket but rather that being the simplest thing to check. Next I'd suggest looking at the filler and vent hoses. To check below the tank, I imagine there's a panel or more to remove.

[OldSpool87]

Check the sender gasket as Suggested above. Make sure the sender is snug. I had a similar issues where a shop don’t snug it up. Smelled gas. Pulled carpet and saw wetness around the sender.

[dannobee]

Guys, it has OBD2diagnostics. If there was a fuel vapor leak bad enough to smell, the check engine light would be on.

[Discseven]

Originally Posted by dannobee

Guys, it has OBD2diagnostics. If there was a fuel vapor leak bad enough to smell, the check engine light would be on.

I looked into this OBD2diagnostics stuff. Fascinating. What I could not tell from the info was whether or not the location of a fuel leak could be told by a scanner.

.

[BoxsterGT]

To the best of my knowledge it cannot, unless there is a pressure drop or a change in mixture.

If that happens, you would have a flood under the car or misfire/rough running.

Len

[dannobee]

The OBD2 system is always monitoring fuel vapor pressure. If it decays at a rate faster than the engine is burning fuel, it'll set a code and the check engine light will come on. It's also applying vacuum and letting pressure build in the gas tank, monitoring for leaks. That's how it knows when the gas cap is loose.

[BoxsterGT]

Doesn't the loss of vacuum in the fuel tank mean an air leak at the cap?

Don't think this could identify a fuel leak, but perhaps fuel vapors could escape.

Learn new things every day.

Len

[911obgyn]

You could do a smoke test on the fuel system, see where its coming out.

[Hi_Fi_Guy]

Do the newer cars still use some form of charcoal canister? We had one fail on a late model Jaguar and the entire cabin smelled of fuel. Replaced the canister, no more fuel smell.

[paulnorwich]

Thank you for your messages, I really appreciate it, I am having it looked at again today. Its really spoiling my enjoyment of the car.

Sorry, what is OBD2?

[paulnorwich]

The smell only occurs as you come to a stop and for a few seconds.

[Quickstep192]

Originally Posted by paulnorwich

Thank you for your messages, I really appreciate it, I am having it looked at again today. Its really spoiling my enjoyment of the car.

Sorry, what is OBD2?

It’s the second version of On Board Diagnostics. OBD detects problems and turns the check engine light on. There’s a connector under the dash to which a reader connects to provide more info. The OBD readers are relatively cheap and are worth having to diagnose and reset a check engine light.