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What should the fuel pressure be on a 99 Chevy suburban with 350 engine?

The fuel pressure specification for a 1999 Chevy Suburban with a 350 engine (likely a TBI or early Vortec system) isn't a single number. It varies depending on the specific engine and whether it's at idle or under pressure. You MUST consult your vehicle's repair manual.

That manual will provide the precise specifications for fuel pressure at both idle and key-on-engine-off (KOEO). Trying to find a universal number online is unreliable and could lead to incorrect adjustments that damage your fuel system.

Generally, for older TBI systems, it's in the range of 12-14 PSI at idle, but again, your owner's manual or a reputable repair manual for your specific year, make, model, and engine is the only reliable source. Do not rely on internet forums for this critical information.

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