Pinch An Inch
If you are diagnosing fuel pressure issues that appear at idle, using the liquid-filled gauge in the regulator may be enough. If your issues appear or get worse under load, it is best to have some kind of fuel pressure gauge that you can see while driving the truck. This can be done with a temporarily installed “mechanics gauge with a hose”, with an aftermarket in-cab electric gauge or with a pressure sensor connected to a monitor screen like an Edge CTS. If you can’t see fuel pressure under load, you are going to have a hard time diagnosing the problem and confirming that it has been fixed.
