SAFARI

4 PL FUEL SYSTEM

Warning :

Unless replacement of vapour separator is necessary, it

should not be removed from the body. Never apply an

excessive force to the vapour separator nipple.This may

result inbend/damage.

c ) Tank Pressure Valve : Fig. 21 & 22

The tank pressure valve is provided to keep the

pressure in the fuel tank constant.The valveoperates

according to the pressure inside tank and engine

ON/OFF condition.

The tank pressure valve opens out when the engine

is ON (since the vacuum from the inlet manifold lifts

thevalve) andallows vapours fromthe tank toengine

viacarboncanister dependinguponopening, closing

of canister purge valve operated by ECU.

The tank pressure valve also opens out when the

engine is OFF and the pressure inside the tank

becomes positive and exceeds on established level

of 3.7 – 5 kpa

The valve is otherwise closed i.e. when the engine is

OFF and the vapour pressure inside tank is less than

3.7 kpa.

When the pressure in the fuel tank becomes

negative (vacuum) and reaches it specified value it

open the valve to let the air flow in the fuel tank via

canister bottombreathingport.

Inspection :

Check tank pressure valve for crack or damage.

Replace if necessary.

Air should pass through valve smoothly from fuel

tank side at moderate pressure.

Air also shouldpasswhenblown softly fromcanister

side.

If air does not pass through valve in step 2 or hard

blows required in step3, replace tankpressure valve.

Warning:

Donot suck air through tank pressure valve. Fuel vapours

inside the valve is harmful.

Removal :

Toavoiddamage to thevapour hoseswhiledisconnecting

slide back the clamps and pull the hoses.

Fig. 22

Fig. 21

TankTube

CanisterTube

VacuumTube