Do in tank fuel pumps run continuously?

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asked Dec 17, 2021 in Repairs/Maintenance by Monteirio (1,380 points)
Do in tank fuel pumps run continuously?

2 Answers

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answered Dec 18, 2021 by Saltydogg (2,150 points)
In tank fuel pumps do run continuously as long as the engine is running.

After the engine is shut off the fuel pump should also shut off but as long as the engine is running the in tank fuel pump also remains running to keep the engine supplied with fuel.

A fuel pump runs all the time but only while the engine is running.

When you turn the key on to start the engine the fuel pump will run for a few seconds and then shut off until you turn the key again to begin starting the engine.

The fuel pump comes back on when you start the engine and remains on once the engine is running.

If the fuel pump shut off while the engine was running then the engine would die and shut off because of no fuel getting to the engine.

The fuel pump is intended to run all the time while the engine is running and then when you turn the engine off and the key off the fuel pump should shut off along with the engine.

If the fuel pump remains running with the engine shut off then you either have an electrical problem or a bad fuel pump relay.

On modern vehicles the  fuel pump runs for a couple of seconds when the ignition is first switched on, it then stops but begins to run the moment the engine starts and constantly runs while the engine is running,.

And if the engine stops for any reason with the ignition still in the on position the fuel pump will also stop.
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answered Jan 30, 2023 by Kroverl (2,960 points)

As they say, prevention is better than cure. Havign worked 37 years in the MRO industry I know first hand that an aeroplane is only as good as its parts and the ame can be said of our servicemen. I can use the analogy of applying an lightweight fuel tank sealant as a bit like tending to a mental wound. In order for our airmen to be at their best we must tend even the smallest gaps and cracks they may receive through their service on a regular basis.

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