is my fuel pump on the way out

[graham A4]

hi all just wondering if any one can advise me on a problem im having. there is some times when i start the car after iv been driving for an hour or so and it struggles to start and then when i accelerate nothing really happens for a while and basically runs dat way for a while. this fault has only occured approx 3 times since having the car which is 9 and 2 of them times were in the last month. any one who has had this problem and can giv me some info would b much appreciated,

regards graham