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Fuel leak
June 25, 2018
10:00 pm
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Mitch
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This is the second time this has happened now and not sure why. During my lunch break I fuelled the car up and then went to Asda for some food. After that I headed black to work. After fuelling the car had done approx 10-15 miles. After it had been parked for a short period, my boss told me the area around my car stunk of petrol. I popped out and fuel was almost pouring out of the filler cap. The car was level and as I say had 10+ miles since fuelling. I turned the key to prime the fuel pumps and it started gushing out. It was almost like there was back pressure causing it to come out. It just kept coming until I took it for a 10 min drive to use some fuel.

I can understand over fuelling it but the way it was coming out doesn’t fit with what was happening. Any ideas? Colleagues think that it over heated and expanded as it was a hot day??

June 27, 2018
12:14 pm
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mac22002
Grays Essex
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Do you have a breathable filler cap ?

June 28, 2018
1:17 pm
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Simon
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second mac22002

is the inside of the cap red or green?

June 30, 2018
8:24 am
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Mitch
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I believe I do have the breathable bersion. Inside of the cap is green.

June 30, 2018
9:37 am
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Simon
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The green one is vented, so you should not get a build up of pressure unless the vent is blocked in some way, not common but possible.

So assuming the vent is working, the vent itself could allow the leak if the fuel level in the tank rose up the filler tube and behind the cap.

My guess is expansion. cool fuel from garage underground storage, warming in the fuel system. The heat from the engine aside, we are storing fuel in an alloy tank enclosed in a metal surround, and its been a little warm recently.

Leave a fuel can in the sun and it will blow up like a balloon. the fuel system has a little more fuel in it.

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