Technical air or vacum in tank

[pete123]

hi my tank reads half full when full get out take the petrol cap off and it releases air like its not gettin any any ideas

 

[urchin]

the breather will be blocked not sure where it is on a multipla but ill have a look on ours tomorrow.

 

[pete123]

let me no what u find out

 

[pete123]

let me no what u find out

Has any one else got any ideas to what this problem might be