XJ-S Convertible (XJ27) V12-6.0L (1994)
Fuel Pressure: Testing and Inspection
For fuel system related Testing and Inspection refer to Computers and Control Systems / Testing and Inspection. See: Powertrain
Management/Computers and Control Systems/Testing and Inspection
The manufacturer does not provide a seperate fuel pressure test procedure. The vehicle is equiped with two pumps inside the tank; nominal operating
pressure is 3 bar above manifold depression. Built into the pump assembly is an overpressure relief valve which blows at 4.5 - 8.5 bar. The second pump
is controlled by the engine control module (ECM) the "switch on" logic is a map based on engine speed and load.