Strong smell of petrol after use (R500D)

[JustCallMeMac]

Hi,

I've recently had my R500D remapped. Not sure if it's a coincidence but about an hour or two after a drive, once the car has cooled down, there is a strong smell of petrol but I cannot see any signs of a leak anywhere and there is nothing on the garage floor. Complete PITA as smell gets in to the house although it eventually disappears with good ventilation.

Any pointers and as I'm a complete novice, please provide as much detail as possible please.

Cheers.

[DCL]

The tank can vent fumes, try removing the filler cap momentarily to equalise pressure when you put it away. If that stops it, look at fitting a new or better non return valve on the vent tube. If not, and there's no obvious leak, it could be a leaky injector (leaks into the maniflod). Once the fuel rail loses it pressure this will stop, but I suspect there would be signs of it running poorly, or rich at idle, if this was the case.

[JustCallMeMac]

Looks like a leak at the fuel tank end.

Noticed a few drops of petrol on the corner of the frame directly underneath the offside edge of the fuel tank, which had just started to drip on the garage floor. Had a good look around the filler cap, hose and filter assembly but they were spotless and from underneath, around the seal gasket but couldn't see anything obvious. Had a clean up anyway but evidence of the leak soon returned in the same area. Unfortunately I can't easily identify where the fuel is coming from with the tank in situ but I suspect the gasket might be an issue and it's a pig to get to.

Looks like a tank removal jobbie.

[PiersR]

Check the fuel level sender rubber gasket. Petrol has a bad effect on the rubber and they break up.

I had the exact same problem with an R300KWK.

Piers

[sdio]

Check the gasket of the fuel level sensor.

[alanjg1]

I had exactly the same on my CSR260.
I traced it to a loose jubilee clip in the fuel line. Located on top of the fuel tank but under the boot floor.
Good luck.
Alan