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DTC 91 Fp low voltage

Dual fuel truck.
Runs great on LP but when you switch to Gasoline the truck will idle all day , but when you travel with it will go into limp mode with code 91.
Manual fuel pressure is between 59-54 psi.
Ground circuit wiring is ok.
Any ideas? Thanks
  • Posted 18 Oct 2018 21:10
  • By Toy1
  • joined 12 Apr'16 - 4 messages
  • Georgia, United States
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