dont have that in my diesel but yup looks like aircon pipe

THAT IS THE FUEL SUPPLY!!!!!!!THAT IS THE FUEL SUPPLY!If its not leaking then you are fine. It is not an ac line

so i guess i should inspect it more closely and try to see if the metal pipe is damaged as well. In cas it's a rat, i don't think a super rat would shew an aluminum pipe... i'll let u know what's the status there, and decide what to do next...

Thanks for the help guys!

Rats - Facts About Rats - Types of Rats - PestWorldforKids.org

buggers can chew through anything

OMG!!! they chew aluminum and lead !!!! i'm having that pipe inspected a.s.a.p!!

OK... I took a close up photo... the pipe seems intact and shiny...

can I safetly say that all what i have is a damaged insulation that has no effect on the functionality/safety, and hence can be left alone?

btw, a curious question: why is the fuel main supply doing a zigzag all around so visible and high? shouldn't be routed tank-pump-engine somewhere deep down?

that is fuel line .the reason the metal pipe is shaped is to absorb vibration and movement of the flexi pipe . have it fixed asap . possibly previous owner had stupid fuel saver magnet fitted and wore through pipe.