Residual Pressure

1. Turn the fuel switch to the on position. Turn the switch off. If the pressure remains within 1.5 - 2.9 psi (0.1 - 0.2 bar) of the original fuel pressure after 10 minutes of the fuel pump off, the system is good. If the pressure drops out of specifications, check for leakage in the pressure regulator and the non-return valve.