Fuel Supply Test; To Test Fuel Pump Output; Charcoal Canister; To Remove Pump/Sender Assembly - Lotus Evora Service Notes

Lotus Service Notes
LN.6 - FUEL SUPPLY TEST

To Test Fuel Pump Output

Fuel pressure is controlled by the fuel pump and pressure regulator valve. Delivery may be checked at
the connection to the fuel rail after de-pressurising the system and using a proprietary fuel pressure gauge.
The procedure for testing fuel pressure, set by the pressure regulator valve on the end of the fuel rail,
is detailed in section Em. Base fuel pressure is 3.0 bar. If the result of this test is satisfactory, the fuel pump
delivery quantity may be checked as follows:
WARNING: Take all necessary precautions to guard against fire and explosion risk when dealing with
fuel and fuel vapour.
1. Disconnect the fuel rail return line (e.g. at quick fit connector), and arrange for collection of return fuel into
a suitable container.
2. Arrange for an auxiliary 12 volt feed to the fuel pump to allow continuous operation.
3. Run the pump for one minute and measure the fuel quantity delivered.
Specification = 2.0 - 2.8 litres.
If below specification, check the fuel filter for restriction before replacing the fuel pump.

To Remove Pump/Sender Assembly

1. Remove the fuel tank (see sub-section LN.4).
2. Release the circlip securing the pump assembly into the tank top flange, noting that the unit is lightly spring
loaded, and withdraw the unit and sealing 'O' ring. Take suitable precautions to catch any dripping fuel.
Cap the tank aperture to prevent dirt ingress and to reduce the fume hazard.
3. To release the fuel gauge sender unit, unclip the black foot from the base of the canister, and disengage
the sender mounting bracket from the canister. Disconnect the electrical cables from the unit and withdraw.
Take care not to damage the float arm.
4. For access to the pump, depress the three retaining barbs, and withdraw the reservoir canister from the
pump assembly. Unplug the pump electrical connector, and pull the pump from its outlet spigot.
5. Thoroughly clean the fuel inlet strainer socks on the pump and canister before refitting.
Re-fitting Pump/Sender Assembly
Fit the pump assembly into the tank aperture using a new 'O' ring, and locate the positional tab on the
pump top plate in the tank flange slot. Retain with the circlip. Refit the fuel tank and 'shear' panel.
LN.7 - CHARCOAL CANISTER
In order to prevent fuel vapour venting from the fuel tank to atmosphere, the breather pipe from the tank
is routed to a canister filled with activated-charcoal, which absorbs and stores the fuel vapour when the engine
is stopped. When the engine is running, the canister is connected to the depression in the intake plenum such
that fresh air is drawn through the canister to purge the charcoal of its absorbed fuel, with the resultant gas
then consumed by the engine in the normal combustion process.

Charcoal Canister

This is mounted on the bulkhead at the left hand front of the engine bay, oriented horizontally with its
base to the left, located in a socket bracket, and its top, which houses the three pipework connections, to the
right and secured to another bracket by a single m6 screw. Access to the unit is available after removal of the
airbox intake trunking.
The right hand end of the bed is ventilated via the lowermost port marked 'AIR', to which is attached a
length of rubber hose routed down the front of the engine bay. The breather pipe from the fuel tank uses a
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Section LN