1998 GMC Safari • 6 cylinder AWD Automatic • 118,000 miles

GMC Safari '98. Fuel pump starts making high pitched sound. OBD = PO452. Then goes away. Also, fuel gauge needle vibrates at a high rate that just makes needle look fat. Gauge goes extreme right and off scale when key first turned on. Fuel pump is only 8 months old and still warrantied, but is very hard to remove as you know. Any thoughts?

August 9, 2011.

Code 452 is low voltage to fuel pressure sensor which is in the tank. I d check for a grounded wire along the harness. Maybe it's become pinched since the install of the new pump.

Aug 9, 2011.