lean
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R
454 low fuel pressure
I have a 1999 7.4 vortec with both banks throwing lean codes. Bank 1 is just slightly above 10% sometimes but bank 2 is consistently 25%. Vacuum tested good @18. New fuel pump, filter, regulator and injectors. Fuel system harness was replaced in ‘21 and I’m still getting less pressure than I’d...- Renncredible
- Thread
- fuel lean pressure
- Replies: 25
- Forum: Engine Performance + Maintenance
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96-00 454 Running Rough
I have a 1999 K2500 with the L29 454. I replaced the 34 gal. fuel tank, fuel lines, upper intake manifold gaskets, and the cap and rotor in the truck. I also replaced the small vacuum line going to the fuel pressure regulator as it was dried out and brittle, and I replaced the PCV hose. Before...- scons96
- Thread
- 454 96-00 intake gaskets l29 lean running rough
- Replies: 12
- Forum: Engine Performance + Maintenance
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