DR-33C Checking For Low Fuel Pressure

1. Turn ignition switch Off, then release pressure in fuel lines.
2. Remove pressure gauge before filter and reinstall it after fuel filter.
3. Depress ATM button.
4. Very gently squeeze fuel return line at pressure regulator valve and immediately let go.
5. If fuel pressure increases above 55 psi., replace pressure regulator valve.
6. If fuel pressure does not increase, replace in-tank fuel pump. Before replacing pump, check for contamination in fuel tank that may be plugging pump filter. Check for corrosion at electrical connections.