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Hello new to the forum after purchasing a cx3 diesel sport nav. after driving a few days i have noticed a strange noise coming from the engine. it sounds like a belt slipping but it occurs on a regular basis every 20 - 30 seconds for 3-4 secs. It doesn't tie in with engine revs and has got me puzzled. any ideas anyone?
 

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Hello new to the forum after purchasing a cx3 diesel sport nav. after driving a few days i have noticed a strange noise coming from the engine. it sounds like a belt slipping but it occurs on a regular basis every 20 - 30 seconds for 3-4 secs. It doesn't tie in with engine revs and has got me puzzled. any ideas anyone?
Welcome to the forum Basher.

I know the sound you mean, it's like a droning sound that cycles or pulses on occasions. Mine used to do it a lot at first but I haven't heard it for a while. It's actually excess fuel returning through the fuel filter head to the tank. Diesels deliver way more fuel to the engine than they actually use and after a while it becomes quite hot. It's normal and the noise is nothing to worry about.

Enjoy the car!
 

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Just an update on this noise. Like you said it has all but disappeared now. I think you were spot on with the diagnosis. Whenever i filled up the tank the noise came then slowly went as the tank went down. Now its gone so thanks for the reassurance.
 

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Beware supermarket diesel whic is full of foam and devoid of detergent additives.
 
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