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All technical contents of this standard are compulsory.
This standard was formulated with the aim to enhance the design and manufacturing quality of fuel tank, to reduce environmental pollution, and to reduce personal injury and vehicle damaged condition caused by the damage of fuel tanks and leakage of fuel in vehicle accidents.
This standard made reference to "Federal Motor Vehicle Safety Standards" FMVSS Part 393 Subpart E "Fuel System" and "Automobile Type Approval Handbook for Japanese Certification" (1977) V-11 "Technical Standard of Plastic Fuel Tank for Passenger Vehicles".
This standard was proposed by State Bureau of Machine Building Industry.
This standard is under the jurisdiction of National Technical Committee on Automobiles of Standardization Administration of China.
Dongfeng Auto Engineering Institute is in charge of drafting this standard.
Chief drafting staffs of this standard: Ning Qiang, Song Pengjun, Xiong Baoping and Yi Xuedong.
Safety Property Requirements and Test Methods for Automobile Fuel Tank
1 Scope
This standard specifies the safety property requirements and test methods for fuel tank used on automobiles fueled with gasoline and diesel oil.
This standard is applicable to metal and plastic fuel ranks used on the vehicles of categories M and N
2 Definitions
For the purpose of this standard, the following definitions apply.
2.1 Fuel tank
An independent tank assembly fixed on automobile to contain fuel, it is assembled as a whole by the fuel tank proper, fill pipe, fill port, cap, pipe joint and other accessories.
2.2 Fuel leakage
Fuel falls down from the tank in line or in drops.
2.3 Rated capacity
Volume of fuel filling specified in the design specification of fuel tank.
2.4 Fire-proof test vessel
A container with flat bottom in which fuel for fire resistant test is to be burned.
2.5 Fire-proof test barrier
A fiat plate to cover the pan in fire-resistant test.
2.6 Vulnerable parts of fuel tank
The parts of fuel tank which are determined as most vulnerable to impact damage according to the shape and fitting method of the fuel tank.
2.7 Ventilation system for fuel tank
Including safety venting system, air inlet valve, air outlet valve and the air vent used for controlling fuel tank evaporative emission.
2.8 Hammer
Steel impact body used in the test of plastic fuel tank.
3 Safety Properly Requirements
3.1 Rated capacity shall be limited as 95% of the maximum liquid volume of fuel tank. The fuel tank with a rated capacity of more than 95L must have a safety venting system, which can be fitted as a separate unit of the fuel tank, or as part of its accessories, In the event of the tank is subjected to fire, the safety venting system can prevent internal tank pressure from rupturing the tank's body.
3.2 The fuel tank with fuel evaporative emission controlling system must have an air vent, which shall be situated above the fuel level when the tank is fully filled, to ensure that the fuel evaporative emission can be emitted out of the tank at any time.
3.3 Sealing performance of fuel tank cap
For diesel tank cap there shall be a maximum leakage rate of not more than 30g/min; for gasoline tank cap there shall be no leakage.
3.4 Opening pressure of safety venting system
In the case of the fuel tank with safety venting system, its opening pressure shall be 35 to 50kPa. After the opening of the safety venting system, the fuel tank shall have all internal pressure not more than 5kPa above such opening pressure.
3.5 Vibration enduring performance of fuel tank
There shall be no fuel leakage of fuel tank when tested in accordance with 4.3.
3.6 Pressure resisting performance of metal fuel tank
There shall be no fuel leakage and crack of metal fuel tank when tested in accordance with 4.4.
3.7 Pressure resisting performance of plastic fuel tank
There shall be no fuel leakage and crack of plastic fuel tank, when tested in accordance with 4.5; however, but permanent deformation is permissible.
3.8 Impact resisting performance of plastic fuel tank at cold temperature
There shall be no fuel leakage and crack of plastic fuel tank, when tested in accordance with 4.6.
3.9 Heat-resistance performance of plastic fuel tank
There shall be no fuel leakage and crack of plastic fuel tank, when tested in accordance with 4.7.
3.10 Fire-resistance performance of plastic fuel tank
There shall be no fuel leakage and crack of plastic fuel tank, when tested in accordance with 4.8.
4 Test Methods
4.1 Test for the sealing performance of fuel tank cap
Fill the fuel tank with water to its rated capacity. With the tank cap being installed, and all other inlets and outlets being sealed, turn the fuel tank until the center line of fill port is perpendicular to ground surface. Wait 15s after the fuel tank has been in steady state, then measure the water leakage for 1 min by using a stopwatch as timer and using a measuring cup to receive leaking water.
4.2 Test for the opening pressure of safety venting system
With the tank cap being installed, and all other inlets and outlets being scaled, fill the fuel tank with compressed air until its internal pressure reaches 55kPa with an increasing rate of 8kPa/min.
