Jimny fuel tank does not breath.

Submitted: Sunday, Apr 12, 2009 at 18:11
ThreadID: 67786 Views:2845 Replies:3 FollowUps:5
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My Jimnys fuel tank cap is very hard to open when low on fuel. When you do loosen the fuel cap it sucks air in.Is this normal? Brian
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Reply By: Member - William H (WA) - Sunday, Apr 12, 2009 at 18:45

Sunday, Apr 12, 2009 at 18:45
what tank on what vehicle.......???????????

William.
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Follow Up By: Brian P - Sunday, Apr 12, 2009 at 18:51

Sunday, Apr 12, 2009 at 18:51
Suzuki Jimny petrol tank. Thanks Brian
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Follow Up By: Member - William H (WA) - Sunday, Apr 12, 2009 at 19:14

Sunday, Apr 12, 2009 at 19:14
Check all your vaccume lines to the tank, one could be blocked off.
Cheers for now...William H...Bunbury...WA.
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Follow Up By: garrycol - Sunday, Apr 12, 2009 at 19:36

Sunday, Apr 12, 2009 at 19:36
William - the original post did say what vehicle.

I do not know the specifics of your`vehicle but many Suzuki tanks vent to atmosphere via a charcoal canister - this prevents petrol fumes from the tank escaping. If the charcoal cannister is clogged which can happen over time the tank cannot vent so when fuel is sucked out by the pump there is a pressure decrease making the cap difficult to remove - the tank may also be being sucked in.

20 years ago I had a Sierra and the cannister was clogged with salt water after a deep crossing - my tank got sucked in and the cap would not come off - until I got it fixed I used a cheap plastic orange cap which let air in.

Cheers

Garry
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Follow Up By: Brian P - Sunday, Apr 12, 2009 at 20:05

Sunday, Apr 12, 2009 at 20:05
Thanks to both of you will check it out tomorrow after work. Also can the canister be serviced by me?
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Follow Up By: garrycol - Sunday, Apr 12, 2009 at 23:12

Sunday, Apr 12, 2009 at 23:12
It is just a container full of charcoal - is a replacement item

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Reply By: mechpete - Sunday, Apr 12, 2009 at 20:02

Sunday, Apr 12, 2009 at 20:02
in my experience the fuel cap should have a valve to allow air to be sucked in from outside the but not pressurise itfrom inside . its called evaporative emission
mechpete
AnswerID: 359326

Reply By: Rangiephil - Monday, Apr 13, 2009 at 10:10

Monday, Apr 13, 2009 at 10:10
Modern tanks have breathing into the inlet manifold controlled by the ECU.
At low throttle and car moving they will open the EEC valve which then vents the carbon canister into the inlet, which is at high vacuum vs the atmosphere.

So it is normal after driving on a long trip for the tank to have vacuum, as the engine vacuum is transferred to the tank.

My Range Rover does the same.
Regard sPhilip A
AnswerID: 359354

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