Mine has been off since purchasing my vehicle (a year and a half ago) due to the nut on the fuel cooler breaking off. I recently bought a Nutsert took and some M8 nutserts and intend to refit it soon purely for neatness looks in the engine bay.
EDIT: fitted the new nutsert in - total cost $40.50 ($40.00 for the nutsert rivet tool and $0.50 for the M8 nutsert). Had to drill the hole out a further 0.5mm to fit it in. Engine cover is now back on.

