Fuel supply Installation

Fuel supply

The following safety instructions must be observed when mounting the dosing pump,routing the fuel pipes and mounting the fuel tank.

Deviations from the instructions stated here are not allowed.

Failure to company can result in malfunctions.


Risk of fire,explosion,poisoning and injuries!

Switch off the vehicle engine and heater before refueling and before working on the fuel supply.

No naked lights when handling fuel.

Do not smoke.

Do not inhale fuel vapours.


Safety instructions for routing the fuel pipes

Only use a sharp knife to cut off fuel hoses and pipes,interfaces must not be crushed and must be free of burrs.

The fuel pipe from the dosing pump to the heater should be routed at a continuous rise.

Fuel pipes must be fastened safety to avoid any damage and/or noise production from vibrations(recommended clearance of approx12.5px).

Fuel pipes must be protected from any mechanical damage.

Route the fuel pipes so that any distortion of the vehicle,engine movements etc.cannot have any lasting effect on the service life.

Parts carrying fuel must be protected from interfering heat.

Never route or fasten the fuel pipes to the heater or vehicle exhaust system.At crossings,always ensure adequate heat clearance,if necessary attach heat deflection plates protective hose.

Dripping or evaporating fuel must never be allowed to collect on hot parts or ignite on electric systems.

When connecting fuel pipes with a fuel hose,always mount the fuel pipes in a butt joint to prevent any bubbles from forming.


1Correct connection

2Incorrect connection-bubble formation

Safety instructions for fuel pipes and fuel tanks in buses and coaches

In buses and coaches,fuel pipes and fuel tanks in buses and coaches

In buses and coaches,fuel pipes and fuel tanks must not be routed through the passenger compartment or drivers cab.

Fuel tanks in buses and coaches must be positioned in such a way that the exits are not in direct danger from a possible fire.


For noise reasons,do not rigidly fit fuel pipes onto structural sound transferring components.

A sponge rubber hose can be pushed over the fuel tubes for nose reduction.


Installation position of the T-piece

Use the installation positions shown in the diagram 18 when inserting a T-pipe


1Direction of flow from the fuel tank

2Direction of flow to the vehicle engine

Fuel supply

Fuel suction pipe install in the vehicle tank or independent fuel tank(optional)


1.Fuel tank 2.Fuel extractor 3.Fuel pipe connector

4. Fuel pipe  5. Filter  6.Fuel pump  7.Damper 8F

A- Fuel pipe surface

Installation position of the fuel pump

Always mount the dosing pump with the pressure side rising upwards.Every installation position over 15is allowed,although an installation position between 15and 35is preferable.

1Installation position between 0and 15is not allowed.

2Preferred installation position in range 15and 35

3Installation position in range 35and 90is allowed.


Damper installation

Damper installation should be according to the practical situation.If the packing list doesnt include the damper then it is should not be used temporarily.

Installation of Fuel Filter(only diesel)

A fuel filter shall be installed before the fuel inlet port. Please make sure that the fuel flow is correctly followed. Its position shall be in conformity with Fig. 21


Fuel filter should be changed after 2 years,fuel pipe and clamps should also be changed. 


Safety instructions for installing the fuel pump

Always mount the dosing pipe with the pressure side rising upwards-minimum incline 15

Protect the dosing pump and filter from intolerable heat,do not mount near to the silencer and exhaust pipes.

Fuel criterion

Gasoline should meet the criterion DIN EN 228

Diesel should meet the criterion DIN EN 590


The fuel brand should be used to meet the requirements of low temperature in winter and biofuels is not allowed.


Fuel supply


After refueling with winter or cold diesel,the fuel pipes and the metering pump must be filled with the new by letting the heater run for 15 min.

Possible suction and pressure height of the dosing pump

Pressure height from vehicle tank to dosing pump:


Intake height in pressure-less vehicle tank:

b=max.1000mm for diesel

b=max.500mm for petrol

Intake height in vehicle tanks with withdrawal by negative pressure (valve with 0.03bar in tank cap)


Pressure height of the fuel pump to the heater:



Check tank venting


1Connection to heater

2Max.fuel level

3Min.fuel level

Installation of Fuel Sucking Device

When fuel is sucked from the vehicle fuel tank or from an independent fuel tank, a sucking pipe shall be used. Attention shall be paid to that the openings on the fuel tank (or tank cover) for installation shall be size φ25±0.2, with trimmed brim and with good evenness around the opening. Good sealing is necessary for the base of the fuel sucking pipe. The bottom end of the fuel sucking pipe shall be 30mm-40mm from the bottom of fuel tank to suck enough fuel and at the same time to avoid sucking in impurities sediment on the bottom of fuel tank(Fig.23).

Fig. 23

If fuel is sucked from the fuel pipe to the engine, the fuel pipe from the fuel tank to the fuel filter shall be disconnected and re-connected with the thicker pipes of the reducing T and the thinner pipe of the reducing T shall connect the fuel pump of the heater via oil pipe fitting and fuel pipe. Must ensure fuel extraction without any pressure and extract the fuel smoothly when the car is stopping.The angle for installation must in conformity with Fig.18, or normal work of the heater will be affected.

After installation, the vehicle engine shall be started and then turned off after one minute’s work to eliminate air trapped in the fuel sucking pipe.


Heater air system
Treatment of Usual Troubles



Fuel supply Installation

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