2.0 HDI 51 reg cut out but now starts, lift pump question

I broke down 2 weeks ago, AA recovered us after not being able to get the car to start.

 

Assumed it was lift pump as couldn’t hear it when car started and had had a lift pump fail previously.

 

Went out to car on off chance today and it started 1st time.

 

Can anyone confirm for me whether the lift pump continues to operate once the engine has started? If not then I suspect it is the fuel relay.

 

Many thanks.

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