2001 GMC Sierra Fuel pump or sensor cutout only off road

2001 GMC SIERRA
90,200 MILES • V8 • 4WD • AUTOMATIC
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JOEL KOH
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My pickup pulles a 135 code which is the fuel sensor. I have replaced the fuel pump and it still cuts fuel to the engine only when I'm off road in bumpy roads. I get towed for a little distance and it will start again. Could I have a defective new Delco fuel pump. It appears something is jogging loose. I have already check all connections and hard wired the pump wires. HELP!
Thanks Joel
Feb 11, 2008 at 1:05 AM
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RASMATAZ
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How's your oil level? might want to test out the fuel pump/oil sending unit-it powers the fuel pump constantly after the engine starts up. could be losing oil pressure and the FPOSU is cutting out-not closing the circuit an intermittently shutting down the fuel pump.

When you replace the fuel pump did you check the fuel pressure?
Feb 11, 2008 at 3:53 AM
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