hi there,i have a rebuilt 5k motor with a 3k fuel pump.now the car runs really well,doesnt miss,on the flat it doesnt starve for fuel,if anything its good on petrol until i go up acertain hill.it nearly cuts out.i have rang a carby rep and he says to look at the fuel pump.my question is,is a 3k fuel pump different to a 5k fuel pump?also the carby is from a 3k[the carby rep says the carby is big enough].any suggestions thanks