NANO

ENGINE 273 MPFI

201

ENGINE

TANK PRESSURE VALVE :

The tank pressure valve is provided to keep the

pressure in the fuel tank constant. The valve operates

according to the pressure inside tank.

1. The tank pressure valve opens out when pressure

differential occurs between the tanks side and

canister side ports and allows Vapour from the

tank to carbon canister. When the pressure inside

the tank becomes positive and exceeds on

established level of 1 – 1.5 Kpa valve opens out.

2. 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.

Inspection:

1. Check tank pressure valve for crack or damage.

Replace if necessary.

2. Air should pass through valve smoothly from fuel

tank side at moderate pressure.

3. Air also should pass when blown smoothly from

canister side at moderate pressure.

4. If air does not pass through valve in step 2 or hardy

blows required in step 3, replace tank pressure

valve.

Warning:

Do not suck air through tank pressure valve. Fuel

Vapour inside the valve is harmful.

Removal:

To avoid damage to the Vapour hoses while

disconnecting slide back the clamps and pull the

hoses.

Assembly:

1. Vapour hoses connections varies for each type of

joint. Necessary care to be taken to connect and

clamp each hose correctly. Use suitable tool for

fitment of clamp.

2. Do not kink/pinch or twist hose when they are

routed. This will reduce the effectiveness of the

emission control system and may damage to fuel

tank etc.

3. Tank pressure valve must be fitted right way round.

The orange colour side must be positioned to face

towards canister .

NOTE:

Unless replacement is necessary, it should not be

removed from the circuit. Do not apply an excessive

force to the tank pressure valve nipple. This may

result in bend / damage.