Is 43 psi enough fuel pressure for a 5.3 liter Chevrolet?

The ideal fuel pressure for a 5.3L Chevrolet engine isn't a single number, it varies depending on the year and specific engine configuration. However, 43 psi is generally too low. Most 5.3L Chevrolet engines operate in the 55-65 psi range at idle and may see slightly higher pressure under load.

A fuel pressure that's too low can lead to poor performance, rough running, stalling, and potentially engine damage. You should consult your vehicle's repair manual or a reliable online resource (like a GM-specific forum) to find the specified fuel pressure range for your *exact* year and model of 5.3L engine. A fuel pressure gauge is a useful tool to accurately measure this.