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Fuel Pump Fault Phenomenon
May 27, 2017

Fuel Pump fault phenomenon; a mileage of about 142,000 km, using 1. 6L BWH type engine and manual transmission of Volkswagen Speed-Teng sedan. The car suddenly appeared in the driving can not accelerate, then the engine flameout, flameout after the failure of the car. Inspection found that the fuel pump fuse (SC27 15A) fusing, the fuse after the replacement of the engine work normal, Fuel Pump but the vehicle after a period of time, will again appear above the fault phenomenon. In the repair station has replaced 6 times fuel oil pump fuse, but the problem has not been completely resolved.


Failure Analysis: The inspection found that the fuel pump fuse (SC27 15A) fusing, the fuse after the replacement of the engine work normal, Fuel Pump but the vehicle after a period of time, the above-mentioned failure phenomenon. In the repair station has replaced 6 times fuel oil pump fuse, but the problem has not been completely resolved. According to the user's description of the failure phenomenon, the initial inspection. Found that the left side of the instrument board in the fuse box SC27 position fuse block has been burned seriously deformed, Fuel Pump the plastic cover outside the fuse has fallen off, leaving only the metal part.


According to the owner, Fuel Pump the beginning of the time when the new fuse can travel nearly 10,000 km, but then the frequency of the replacement fuse more and more high, Fuel Pump the last service station simply to replace the fuse wire 20A, the time to adhere to a little longer. According to the above analysis, the vehicle may be overloaded with electricity, resulting in SC27 15A fuse is often fused. Check the circuit diagram that SC27 15A fuse alone to fuel pump power supply. The possible reasons for the frequent fusing of the fuse are: the quality of the fuse, the loosening of the weld wire, the bad of the fuel pump, the short circuit of the fuel pump and the excessive load of the fuel pump. Check the fuse socket on the fuel pump fuse, there is no loosening. Fuel Pump The fuel pump on the iron point grinding treatment after the test, the fault remains.

Use V. A. 5054 measuring fuel pump working current, fuel pump working current up to 22.7A, far more than 15A, the analysis that the fault should be the fuel pump internal short-circuit caused by its resistance too small to pass through the current become larger, fuel pump fuse frequent fuse. Check the maintenance manual that the fuel pump working current maximum of 9A. Troubleshooting: After the replacement of fuel pump, again read the fuel pump working current, for 7. 22A, the above fault phenomenon disappears.


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