left my rs parked up for 2 weeks, started perfect short drive later, parked it up for 5 mins, went back an it wont start, the prime/buzz sound on the fuel pump sounds weak an like its blowing air, thers petrol in it, fuel pump shagged?

 

Could be, but check the basics first:

Spark?
Fuel to Injectors?
Air leaks?

Go from there.

 

i had the same prob how much fuels going to the fuel filter is it spraying out. get a volt meter and see how much volts you got should be 12 volt. whats your meter unit like could be worn