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It is on top of the fuel rail under the engine cover and is readily accessable.
Fuel Pressure Regulator Replacement Removal Procedure
Important: Always maintain cleanliness when servicing fuel system components.
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Yes, The fuel pressure regulator is on the fuel rail and is retained by a clip. There will be fuel pressure behind it so the fuel pressure must be bled off prior to removing it or fuel may spray and could get in your eyes.
need help on a 1999 Chevy K3500 pickup with a 7.4 L