hi peeps along the side of my fuel pump relay on my s2 rst is a smaller green relay can anyone tell me what this actully does as it has started buzzing like mad,iv changed the relay but still the same ,i guess it is something to do with the fuel pump system as the plug looks identical to the fuel pump one only its green. although the car seems to run fine without this relay im very curious to what it does. any help much apreciated.