I don't think a noisy pump will affect fuel economy at all.
As for the noisy-ness and likelihood of imminent failure -- I can't help. I've had a noisy pump may be 3 or 4 times and always changed the pump before it failed. Too gutless to risk it! They are cheap if you order from the UK and since you've got the top open most of the work in changing it is done!
Bryan.
ps: My first one was so noisy I could hear it at 100km/hr from inside the car...


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