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When Power Disappears from the Fuel System
Fuel Pump Not Powering Up? Start at the Circuit.
A no-power fuel pump doesn’t always mean a bad pump. It could be a bad signal, failed control module, or even a forgotten collision switch.
Power loss at the fuel pump or injectors is one of the most misdiagnosed causes of a crank-no-start or lean condition. At Keeney Auto & Diesel, power delivery is verified under load—not just voltage at a connector, but full current flow across real-world circuits.
This includes:
- Checking fuel pump relay function under real current loads
- Measuring voltage drop across power and ground paths
- Verifying injector pulse with load simulation if needed
- Capturing intermittent power dropout events using scope-based datalogging
Intermittent failures, melted fuses, or blown pump driver modules often leave no obvious trace. This is where load-side testing, dynamic measurement, and waveform analysis make the difference.
If someone told you “it’s getting power” but it still won’t run, it likely wasn’t tested this way.
