S70: - Significant pressure build up in fuel tank

Tweedle12 · Feb 24th, 2021, 18:46

Good evening,
My 1998 S70 T5 has just developed an issue that I am worried could result in bigger problems. Basically the last two times I have filled up there has been a surprising release of pressure from the tank when I open the filler cap. Any idea what it could be? I have a couple of hundred miles journey to do in the car at the weekend - am I wise to attempt it?

Cookeh · Feb 24th, 2021, 20:16

Check the vacuum lines to your evap hoses. Also check the rollover valve, and the evap valves. All easy enough to check and or replace.

Dippydog · Feb 25th, 2021, 08:27

Fuel tank vent blocked? Not sure where they are on these but either a very small hole in the filler cap or a small bore rubber pipe attached high up on filler neck.

Feb 24th, 2021, 18:46	#1
Tweedle12 Member Last Online: Yesterday 21:27 Join Date: Apr 2018 Location: Belfast	Significant pressure build up in fuel tank Good evening, My 1998 S70 T5 has just developed an issue that I am worried could result in bigger problems. Basically the last two times I have filled up there has been a surprising release of pressure from the tank when I open the filler cap. Any idea what it could be? I have a couple of hundred miles journey to do in the car at the weekend - am I wise to attempt it?

Feb 24th, 2021, 20:16	#2
Cookeh Premier Member Last Online: Sep 14th, 2022 17:04 Join Date: Jan 2018 Location: Derbyshire	Check the vacuum lines to your evap hoses. Also check the rollover valve, and the evap valves. All easy enough to check and or replace. __________________ 1995 Volvo 850 T5 Estate (Manual)

Feb 25th, 2021, 08:27	#3
Dippydog Premier Member Last Online: Yesterday 18:24 Join Date: Jun 2016 Location: S****horpe	Fuel tank vent blocked? Not sure where they are on these but either a very small hole in the filler cap or a small bore rubber pipe attached high up on filler neck.

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