Fuel Pressure Check

1. Unscrew test port cap nut from injection line. Use caution to catch spilling fuel and to ensure sealing ball does not fall out of cap nut.
2. Install suitable fuel pressure gauge and hose to test port.
3. Start engine and allow to idle, then measure fuel pressure.
4. Fuel pressure should be approximately 29 psi.
5. Disconnect left pressure regulator vacuum hose. Fuel pressure should increase to 33 - 39 psi.
If engine cannot be started, remove relay XVII and bridge terminals 30 and 78. Fuel pressure should be 33 - 39 psi.
6. If fuel pressure is not within specifications, slowly squeeze fuel return hose with a clamp near fuel sender. If pressure now increases to under 50 psi, check fuel filter and fuel pump and replace as necessary.