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Author Topic: Petrol expansion on a warm day.  (Read 650 times)
0 Members and 1 Guest are viewing this topic.
Posts: 242

« on: 03 September, 2023, 03:01:33 PM »

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?

Posts: 542

« Reply #1 on: 03 September, 2023, 04:42:01 PM »

Probably leaking from the joint between filler pipe and tank.

Andrea Nistri

Ardea S2
Appia S2
Fulvia GTE
Fulvia Sport 1.3 S
Fulvia Montecarlo
Fulvia Coupe 1.3 S
Posts: 242

« Reply #2 on: 03 September, 2023, 05:39:03 PM »

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.
Permanent resident
Posts: 1649

« Reply #3 on: 04 September, 2023, 01:12:23 PM »

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.
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