Hi, should there be a 'hiss' every time you open fuel cap??
Had some issues with fuel smell and recently Joe replaced whole tank as suspected a leak somewhere!! This got rid of fuel smell and 'hiss' came back but recently it's gone again!!! What's going on? Is it the hot weather?
Yup, that's normal, particularly in warmer weather when the vapour in the tank expands in the heat.
Twas one of my favourite sounds when I had the Coop, opening up the filler car in a station forecourt. Sounded like you were opening up Mr.Fusion to feed power to the Flux Capacitor.