BMW X5 SUV driving flameout detection engine control unit maintenance personnel found that when starting the engine fuel supply system of high and low pressure side of the hydraulic are 0 M Pa. Check the fuel gauge and found adequate oil. Remove the fuel pump checked and found plastic snake oil pump output pipeline rupture. Replacement pipe, the engine start normally.
Soon the car returned to the manufacturer for the same fault. Check again found that the last replacement tubing rupture in the same location. This allows maintenance personnel to improve alertness, a thorough examination of all parts of the fuel tank. Check the bottom of the fuel tank found in depression, under normal circumstances this is caused by the drag bottom. But the end of the fuel tank and pipeline rupture drag what is the link between this problem so that maintenance staff baffled. Can not find the answer in the premise, in order to eradicate failure, decided to replace the fuel tank assembly.
Unexpectedly long after, the same fault occurs again. Even more puzzling is that the pipeline rupture and deformation of the bottom part of the tank completely consistent with the last. This can not be a coincidence. In order to completely identify the cause, maintenance personnel check the fuel tank with the relevant information. Of its structural features can be seen, the fault should be a negative pressure on the fuel tank. This is because, when a negative pressure exists in the fuel tank, the fuel tank may not be squeezed and deformed, but also because of the tubing excessive external pressure and rupture. The negative pressure can only be derived from the intake manifold pressure.
Remove the canister, it was discovered one of the carbon particles saturated adsorption fuel. Obviously, this is because there is no fresh air into the canister, the purge of the carbon particle is formed, which coincided with the negative pressure in the fuel tank before the speculation about coincide. Check the fuel tank seal test unit and found it badly clogged air filter by sediment.
Troubleshooting: Replace the tubing and seal air filter test unit, troubleshooting.
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