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Discussion Starter · #1 ·
Cant find anything on scanner except electric pump pressure jumps to 70 psi during hiccup and high pressure rail goes from 26000 to as low as 5000 psi. Truck jumps bad like a tranny issue but got one code p0191. Is it likely its one of the fuel pressure regulators? Might just replace entire high pressure pump to be safe. Any help greatly appreciated
 
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