I'm adding an additional fuel tank to my Mercedes Vario along with some addition plumbing to allow electric switch over between the tanks plus an inline filter with a water trap. The new tank location means an additional 4-5m of 8mm piping (including the return circuit). The question I have is: Will the existing fuel pump have the strength to still circulate the fuel? and if not, would a Facet pump like this (see link) give sufficient flow?
http://www.ebay.co.uk/itm/UNIVERSAL...636?pt=LH_DefaultDomain_3&hash=item233250d544
http://www.ebay.co.uk/itm/UNIVERSAL...636?pt=LH_DefaultDomain_3&hash=item233250d544