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E46 320d. Inline fuel pump problems.

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As above. Lately seems my inline helper pump is taking longer to prime than normal.   Also I have noticed that whilst driving it can be heard running. Is this normal ?  I thought once started the helper pump should then stop. 

 

Appreciate any help. 

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The inline pump must run constantly because when it failed on mine (at around 110k miles) I was driving at 40mph and the engine unexpectedly cut out!

Picked up a replacement pattern part from ECP at the time, 30 mins to replace including raising and lowering - relatively simple diy fix.

The replacement pump has always been significantly noisier than the original. Sometimes the pitch of the whining/buzzing noise varies too, but it's been reliable for 50k miles now.

 

 

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