Fuel smell after brimming 996turbo

[the other me]

Recently whilst driving after filling up (I stop fuelling when it cuts ,don't try to force the last drops in ) there is a smell of fuel for the first few minutes driving. Any ideas ?

[Magic919]

Open the window?

[TTX50]

Happened to me a couple of times - on both occasions I hadn't screwed the filler cap back on properly - could it be that?

[Rockster]

the other me said:

Recently whilst driving after filling up (I stop fuelling when it cuts ,don't try to force the last drops in ) there is a smell of fuel for the first few minutes driving. Any ideas ?

I've never smelled gasoline after fueling any of my Porsches.

Is the nozzle contaminated with gasoline from a previous use?

Is the nozzle leaking?

Are you sure you are not getting some fuel on your hands when you move the nozzle from the pump to the filler neck or from the filler neck to the pump?

Be sure the fuel cap is secure.

If you fill to the point the fuel runs out or you tip the nozzle and dribble some fuel out of the nozzle there's a drain in the fuel filler tube basin. This drain leads to a hose that should carry any fuel down to underneath the car.

If the hose is damaged fuel may not drain or drain out someplace inside the car. This can have fuel fumes being pulled into the cabin as you drive down the road.

Once in a while I "test" this drain by when I am washing the car pouring some water in the drain basin and noting the water runs out under the car and from the drain hose end and not from off the top of a plastic panel.

If you are sure the answer to all of the above is no then you have to consider a fuel system fluid or vapor leak.

If you want remove the battery cover and the two plastic panels on either side and after a fill up carefully check with a bright flash light for any signs of wetness (fuel) around the fuel pump cover or any signs of leaking fuel lines.

To eliminate the fuel vapor recovery system requires more work and probably a tech's expertise and access to the proper diagnostics computer to exercise the vapor system to check for leaks.

There is another possibility: In a dealer service bay I came across a new Cayman that was in for repairs after rodents (mice) had been at the car. One thing they loved to chew on was the plastic fuel vapor line that runs down the center of the car under the car but above the plastic under body panel/tray.

The creature stopped chewing when it chewed through the plastic vapor line and probably got a snoot full of high test.

[the other me]

Thanks for that, as you say I have eliminated cap not on/ overfill so it is something else. I am only smelling it for the first couple of minutes after fill-up, so am guessing not fuel vapour leak as I guess that would continue even with a less than full tank.

[ricola]

the seal on the filler cap can sometimes get dislodged, worth checking as it's an easy fix..

[monthefish]

the other me said:

Thanks for that, as you say I have eliminated cap not on/ overfill so it is something else. I am only smelling it for the first couple of minutes after fill-up, so am guessing not fuel vapour leak as I guess that would continue even with a less than full tank.

On your shoes perhaps?

[Rockster]

the other me said:

Thanks for that, as you say I have eliminated cap not on/ overfill so it is something else. I am only smelling it for the first couple of minutes after fill-up, so am guessing not fuel vapour leak as I guess that would continue even with a less than full tank.

Not necessarily. As you fuel the vapor recovery system captures some of the vapor to avoid this vapor from being vented to atmosphere.

If there is a leak in this vapor recovery system this vapor can leak out -- part of the system is under the right hand side of the car under the front fender in the general vicinity of the fuel filler tube. When you start the engine and drive the car the DME will air out this canister so it is ready to accept vapor from the tank as the fuel heats up.