My beetle has been very naughty today. 2 Breakdowns!! Both times there was a loss of power, as though you were running out of petrol. then it would start and rev a tiny bit on its own without me touching the accelorator and then die... an hour later it started and went..after i broke down and was having trouble starting it there was no fuel in the filter.... is this a sign of my fuel pump? it seems to only do it when the car is hot.. any help would be great.