we have a vauxhall astra 1.6 16v that loses power when cornering and on hard acceleration. We have checked all the electrics with no success, however... we have driven the vehicle with the fuel pressure gages connected and there is a notable drop in fuel pressure. At first we thought that the fuel pump armature was probably loading up and slowing down when certain forces are acting upon it.
We changed the pump but alas it's still the same. I have checked the swirl chamber and I believe that the return hose that is connected to the bottom of the swirl chamber may not be returning all the fuel to the chamber. When we connect an air hose and lightly inject air into the hose we not only get bubbles from inside the chamber but also within the tank near the connection to the chamber.
Has anybody out there seen this fault before?