Hi Phil. As far as the Fuel quantity in the tank it seems to make no difference at all. I do have the large Bosch fuel filter and I renewed it during the diagnostic stage. My suggesting that the accumultor was leaky was actually taken from the internet and what other owners had experienced. After removing the sending unit from the tank it did appear that the accumulator was somewhat loose . I had expected it to be much tighter . Not having the required fuel pressure at the rail resulted in backfiring and poor accelerator response. I made another post about the hesitation and backfiring .The only issue I am having now is an idling one. I believe the coolant temperature sensor is bad as the car seems to think it is cold and the revs stays pretty much at 11-12 hundred rpms. I will be removing that sensor a shortly and testing it .