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[Andy H]

Why on earth would copper fuel lines be needed?

The single biggest advantage of metal fuel pipes over plastic is fire resistance. Gas supply pipes to buildings are plastic outside but it is illegal to install plastic inside a building.

In motor vehicles the risk of metal fracture is probably as great as any fire risk so no clear advantage either way 

[chrisgixer]

Why on earth would copper fuel lines be needed?

The single biggest advantage of metal fuel pipes over plastic is fire resistance. Gas supply pipes to buildings are plastic outside but it is illegal to install plastic inside a building.

In motor vehicles the risk of metal fracture is probably as great as any fire risk so no clear advantage either way 

So no reason what so ever then.

[Kevin Wood]

Plain copper pipe work hardens, so not ideal in a vehicle where it's subject to vibration. Kunifer pipe is OK, but given that the fuel tank is plastic, a bit of plastic fuel line does no harm and will outlast the car as long as it doesn't get damaged.

Also, with increasing percentages of ethanol in fuel, you need to be careful which metals and rubber components are used in fuel systems. Best to stick with the standard components unless you have a specific reason to go "off piste" IMHO.

[Vicar]

Thanks for all the above advice. I'll probably get the car on ramps over the weekend and have a look and see. I do remember ducking away from fuel after doing one a while ago.