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Fuel pump current waveform

  • btisher05
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1 day 11 hours ago #92315 by btisher05
Fuel pump current waveform was created by btisher05
Vehicle:  2014 Kia Forte LX 1.8L engine.
Fuel Pump Current Waveform

Does this waveform of the fuel pump current taken with a low amp clamp at the fuse box look like a bad pump?

No codes and other than a very slight shake when at idle with a warm engine no issues.  I think the engine shake could be the result of a slightly slack timing chain. 

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1 day 10 hours ago #92316 by Blechvogel
Replied by Blechvogel on topic Fuel pump current waveform
Not an extremly nice wave form but it does not look like a bad pump to me. The average current draw i enough to maintain system pressure (which I suppose should be aroun 40 to 45 psi on this car).

One revoltion takes around 8ms give or take so its around 7500 rpm.

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1 day 6 hours ago #92318 by btisher05
Replied by btisher05 on topic Fuel pump current waveform
Do you think some of the commutators could be going bad or could there be some other reason for lack of uniformity in the waveform?

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