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August 24th, 2017

8/24/2017

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Determining the Health of your Fuel Pump

Case Study on a Suzuki SV650S.

We can check the health of the fuel pump and filter by using a technique with our scope called "Current Ramping" What is is essentially is looking at a currrent draw waveform when the fuel pump is activated. Looking at the first waveform you can see the irregular pattern. This is an indicator that the pump is worn ( bushings, brushes, commutator etc.) We can also determine the pump rpm and average current draw which can also indicate a partially restricted filter element or a pump that is on its way out.
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We replaced the in tank fuel pump and in the next picture you can see the obvious difference in the waveform. Regular pattern, average of 5 amp draw and aprox 6,000 rpm. Finding this probably saved a customer from being stranded somewhere.
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Below is a picture of the fuel pump disassembled. The commutator is badly worn and there is hardly anything left of the brushes. This pump was certainly on the way out.
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    I have been involved in mechanics and motorcycling from a young age. I formed Cycle Improvements in 1981 and still have the same passion to learn today as when I started. Hope you find this blog interesting and educational.

    James Hunt

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