Is this fuel line rattle?

[Bennz]

Every now and then I can hear pulses of what I can describe as rattles ( 5-6 rattles at the time ) mainly coming from the left side of the car ( passenger ). First I thought it is aircon or the airways flaps but it seems that's not the case. 
Haven't had a chance to take the car somewhere to jack it up but just want to see is this the rattle of fuel lines or could be something else ?

Thanks

[ROH ECHT]

I used to hear something that sounded like a slow jackhammer off in the distance. Never found out what it is and don't even notice if it still does it. It either stopped or I got used to it. While searching for an answer I was told it is something related to fuel pressure, but never heard a good enough or acceptable explanation.

[Bennz]

This is not like a tapping noise , almost sounds like vavle tapping but it's not from engine. I can hear it in the cabin by passenger side and outside on the left hand side of the car. It comes and goes as a rattle

[Gene Hunt]

When my fuel line did the ''rattle'' it was from the drivers side. Only did it on tick over & once the lines were secured again it's never done it again.

[Bennz]

Hmmmm mine is coming from left side of the car.almost like from behind and beneath the engine where the cabin starts ( based on how and where I hear it from ) it's audible from outside as well when stationary

[D Squared]

mine does something similar on occassion, i've put it down to the heater flap end stop issues....Can really only hear it when radio is off etc at idle..