Petrol expansion on a warm day.

[HBG]

Came home yesterday to see a drip drip of petrol on the floor under the rear wing. I've had this before with a full tank and a warm day.

I didn't open the filler cap. There was no fuel inside the flap so it wasn't leaking through that small drain.

The car is parked on a slight slope so that the filler cap is slightly down hill with can't help but is this normal? Surely the car can cope with a little expansion?  What if it gets really hot?

Thanks

[nistri]

Probably leaking from the joint between filler pipe and tank.

[HBG]

All dry under there. Do these cars just not have enough expansion capacity with a full tank? Should I just not fill it up unless I'm a out to hit the road.

[ColinMarr]

The plastic vent pipe from the top of the tank goes up high inside the rear wing and then down and out below the filler pipe. On the up-hill side there should be a plastic ‘bottle’ for any fuel to drain back to the tank. Sometimes, this bottle is missing and dollops of fuel can appear on the down side. I had this issue with my Fulvia and it puzzled me for ages.