Test NS-4B - Correcting Fuel Delivery
WARNING:
Fuel system must be opened and may be under high pressure.
- Ensure fuel tank is at least 1/4 full. Relieve fuel system pressure. Remove fuel return hose from fuel rail. Connect a 6 foot long piece of fuel hose to fuel rail return fitting. Place other end of hose into an approved gasoline container (minimum 2 gallon capacity). Turn ignition on. Using DRB-II, actuate ASD fuel system.
- Read fuel pressure gauge. If fuel pressure is 43 psi or more, replace fuel pressure regulator. Perform VERIFICATION TEST VER-1 . If fuel pressure is less than 43 psi, turn ignition off. Reconnect fuel return hose. Disconnect fuel return hose from fuel tank. Connect 6 foot long piece of fuel hose to disconnected fuel return hose. Place other end of fuel hose into an approved gasoline container (minimum 2 gallon capacity).
- Turn ignition on. Using DRB-II, actuate ASD fuel system. Read fuel pressure gauge. If fuel pressure is less than 43 psi, replace fuel return assembly in fuel tank. Perform VERIFICATION TEST VER-1 . If fuel pressure is 43 psi or more, repair restricted fuel return line between fuel rail and fuel tank. Perform VERIFICATION TEST VER-1 .