:loud point test dropped
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CHANGE in the method of tablishing the wax precipition point in diesel fuel has !en incorporated into British andard 2869 Petroleum for il Engines and Burners.
The Cold Filter Plugging Ant (CFPP) method has placed the cloud point test !cause trials have shown that CFPP is a more realistic way of simulating fuel performance in engine systems using gauze suction filters. Modifications to systems using other types of filter may be required.
Diesel engine fuel systems invariably incorporate fine. filters to protect the injectors from dirt particles entering with the fuel. In very cold weather, these filters can become blocked because of wax deposits from the fuel, leading to erratic operation, loss of power and even stalling.
The low temperature performance of diesel fuels has, up to now, been controlled by specifying a maximum cloud point. However, the BSI has thought for some years that cloud point is not a good measure of fuel performance under practical conditions and the cold filter plugging point test has been devised.
Makers' backing
Engine manufacturers fully support the introduction of the test and have been designing fuel systems on their vehicles in accordance with its requirements for some time.
A small proportion of older engines have fuel systems, which, unless modified, may be more liable to wax blockage In cold weather because they are not produced to the new standards of design. To allow for these minor modifications the change to the CFPP test will not become effective until October I.