engine performance on 1996 Chevrolet Express 1500

recently the van has experienced a total loss of power when accelerating. diagnostic codes p1133 and p1153 and p0151 were found. i replaced both upstream o2 sensors and the maf sensor. no good. found a vacuum leak in the upper plenum and regasketed that. nada. van hard start now and as soon as you touch the accelerator it bogs down and tries to stall out. i do have a high pitched whine coming from my fuel pump and when the van shuts off a sound like the fuel is surging back to the tank. could my fuel pump be causing the hard start and lack of power?

Asked by for the 1996 Chevrolet Express 1500
2 answers
usually when the pump wines its due for a change
you need to get it checked asap before it fails totally. a simple test will confirm.
make sure you change the filter too.