fuel psi on a duramax LB7
 

I have a Fass fuel 150 fuel system, What psi should i get at idle? normal driving? and racing? Im getting a gauge soon i just would like to know what the psi should be before i get EFI live. thanks.

no more than 12psi to the cp3, it will cause funny things at idle. the AD165 is set to 10psi and its more then enough. As long as its getting posotive pressure to the cp3 ur good.

i also haveit get 90hp injectors .... Will it get any lower than 10psi with a hot efi tune ya think?

the pressure will drop, 10psi at idle is fine, the injectors alone dont make a difference in the supply pressure to the cp3. the cp3 will flow what it can and even with stock injectors, the tuning you use will demand the cp3 to flow more/less, drawing more fuel to keep up with demands.

that being said having positive pressure is alot better then none. Mine has been as low as 4psi but i have under wot with a full tank, and i have seen it with no pressure due to the fuel sloshing around in a nearly empty tank

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