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?
engine performance on 1996 Chevrolet Express 1500
by Visitor in Elyria, OH on December 29, 2010
ANSWER by bakerbaker , February 08, 2012
usually when the pump wines its due for a change
ANSWER by mastertech6371 , December 29, 2010
absolutely. you need to get it checked asap before it fails totally. a simple test will confirm. make sure you change the filter too. roy