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2001 GMC Sierra Fuel pump or sensor cutout only off road

Tiny
JOEL KOH
  • MEMBER
  • 2001 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 90,200 MILES
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
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Monday, February 11th, 2008 AT 1:05 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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?
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Monday, February 11th, 2008 AT 3:53 AM

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