You do indeed need a card. In my experience,which is many years old, some banks make you jump through all sorts of hoops and others say no problem and issue one straight away. The card draws debit fashion directly from your account. There's a small annual charge for the card. Not all stations stock red diesel(gasoil b) the independents in rural areas are more likely too. Just go into your bank and enquire. Good luck.
Bruixot