Fuel lines

Tiny
BARBLEE95
  • MEMBER
  • 2002 GMC YUKON
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Need a diagram on how && what fuel lines run where
Tuesday, July 15th, 2025 AT 8:12 AM

3 Replies

Tiny
AL514
  • MECHANIC
  • 5,499 POSTS
Hello, is this a Flex Fuel vehicle? The 8th digit in the VIN number should be either a T or Z, that will tell us if it is a Flex Fuel system (VIN Z) or not (VIN T). Or you can just post the entire VIN number here and it will take us directly to the correct vehicle in service information.
And is there a specific section of fuel line you are addressing, such as back by the fuel tank or in the engine compartment?
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Tuesday, July 15th, 2025 AT 10:09 AM
Tiny
AL514
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These are the instructions and routing of the fuel lines on the Chassis going back to the fuel tank, the 2nd diagram with the transfer case will not apply for your vehicle being 2WD, To relieve any fuel pressure before disconnecting lines or adapting a fuel pressure gauge to the Fuel rail, you can pull the fuel pump relay and crank the engine over, it may start for a few seconds, but will then stall out due to fuel pressure dropping off. The fuel line diagrams look the same for the Flex Fuel and conventional system. If you need any further info just let us know.
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Tuesday, July 15th, 2025 AT 10:30 AM
Tiny
AL514
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Here is some additional information, the fuel vapor diagrams (2, 3) for either a single or dual fuel tanks, the fuel pump relay location and hooking up a fuel pressure gauge.
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Tuesday, July 15th, 2025 AT 10:39 AM

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