Fuel Pressure: Fiat
- Release fuel system pressure. Disconnect vacuum hose from fuel pressure regulator. Remove fuel supply line at cold start injector and connect fuel pressure gauge in line with a "Y" connector.
- Crank engine and check pressure reading in Fuel Pressure Specifications chart. If pressure is lower or higher than specified, pinch return fuel line. If pressure increases, replace regulator. If pressure remains constant, check fuel pump operation. If no reading is measured, replace fuel pump and repeat test.