Ok, easy mistake, fuel pump wont like petrol, but in this case, more diesel than petrol, just drain a bit off, should be fine 
I hope none of the bike saddle sniffers read this, it will give them a whole new hobby :}Micky said:Try sniffing the nozzle before inserting, although this does lead to some strange looks from other refuellers.
The alternative is to spray a little of the fuel on the forecourt and throw a lighted match at it, expect stern words from the magistrates though.