Fuel Pump Pressure Test
- Disconnect fuel line between fuel pump and fuel filter inlet on the engine. Install fuel pressure gauge on fuel line.
- On V8 engine, start engine and run at slow idle using fuel in injection pump. Pressure should be 5.5-6.5 psi (.39-.46 kg/cm2 ). Replace fuel pump if pressure is too high, too low, or varies materially at different engine speeds.