Im working on this barn find car new to forum and MGBs, anyway was checking fuel pressure@ 2.5 psi., with switch on, then did volume test, less then a quarter qt. I then checked the voltage to pump, and the voltage is pulsating 10v, and then nothing, like off and on every second, it also looks to be rewired because every one was talking about white wires to the pump where as mine are blue, is it suppose to pulse with key on and then when running speed up Im stumped on this, it will run and drive, but backfires and sputters in 4th gear, any help appreciated.