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?

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

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