if your car is running low on petorl would this cause it not to boost as i have just filled it up and its going like mad as i have only had the car for a few weeks i have been putting in a fiver or a tenner. whan i brought the car the lad said the petorl guage did not work and putting five or ten pound in is not going to take it out the red antway as it was just not moving at all but i have just filled the tank and its boosing a lot better now but the turbo guage is still not moving much at all only going to 0.4 can anyone help me please