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2023 Silverado HD 6.6L Diesel Fuel Pressures

Eric Homes

By Eric Homes
in Ask A GM Technician

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Eric Homes New Member

Eric Homes

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Does anyone know what the idle fuel pickup pressures should be on a 2023 6.6L SilveradoHD? (Roughly 80° outside)

My Autel scanner says I should be around 60psi while I am at 45-46.

In PARK under load and also at idle, the pickup psi stays at 45ish but as soon as I am in gear and on the gas, rail pressures rise as normal 15-24k, while pickup pressure drops to 23-25psi. I don't know if this is an FPC issue, or the pickup pump is somehow damaged. (Filter is new, tank is clean, inside of pump basket and pickup screen are all clean)

Any info would help.

Appreciate your time,

Eric

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