It is a little known fact that many vehicles used to run the bosch ve pump and they had no extra lift pump, relying totally on the ve internal vane pump.
I got sick of lift pump failure (90 still ran/started fine just down on power at higher rpms) so I removed the block mounted lift pump and fitted a Facet unit, weirdly Facet switched on or off it runs the same, ie quite well, so the mechanical lift pump is needed in extreme situations, but when it fails it actually causes extra resistance!
I got sick of lift pump failure (90 still ran/started fine just down on power at higher rpms) so I removed the block mounted lift pump and fitted a Facet unit, weirdly Facet switched on or off it runs the same, ie quite well, so the mechanical lift pump is needed in extreme situations, but when it fails it actually causes extra resistance!