fuel filter JAGUAR S TYPE 2005 1.G Technical Guide Update

JAGUARS-TYPEFuel System
40
J.310.046
Fuel Filter
Fuel Rail
Fuel Injectors
Fuel Injectors
Fuel Level
Senders
Jet PumpJet PumpFuel Pump
Fuel Reservoir
Parallel Pressure
Relief Valve
Pump and Sender
Electrical Connector
RH Compartment
LH Compartment
Fuel Flow
The variable speed fuel pump is contained in a
fuel reservoir in the RH module assembly. Fuel is
pumped from the reservoir through an external
cross-over pipe to the LH compartment where it
flows via a T junction to the parallel pressure
relief valve and then out to the engine fuel rail.
The reservoir is maintained by fuel supplied by jet
pumps in the LH and RH compartments.
Pressurised fuel from the variable speed pump is
forced through the small jet nozzles (diameter
0.5mm) creating a suction which draws fuel up
from the tank. From the LH tank, this fuel is
pumped through an external cross-over pipe and
then into the reservoir. In the RH tank, the jet
pump is located in the base of the reservoir.
The parallel pressure relief valve assembly
contains two spring loaded valves which operate
in opposite directions, a fuel rail feed valve whichopens at approximately 2 psi during normal
operation and a second valve which opens at
approximately 45-70 psi to relieve excessive rail
pressure.
The main functions of the valves are:
¥ To help engine starting by retaining fuel in the
supply lines and rail.
¥ To limit rail pressure due to temporary vapour
increase during hot soak conditions
(temperature and thus pressure drop after
approximately 20 minutes).
¥ To limit rail pressure caused by sudden load
changes such as a full to closed throttle
transition.
¥ To prevent siphoning from the tank in the
event of the fuel line being severed with the
pump inactive.
Each side of the tank has an independently
FUEL FLOW
Sender Electrical Connector