If you have the option then fit the Racor
so that it is level with the fuel tank
On board Talisman there are two Racor 500s (one at 20 Microns and one at 10 microns) both are fitted in such a position that when the tank is full Racors fill them self.
The Racor 500s run just fine with a little air in the tip (filter), better with all fuel
but ok with a little air, portion on the unit.
When changing the filter as you remove one filter the new one should just about replace the same volume of diesel
so the level should not change by very much. Again when fitting the 500s to Talisman I also fitted a Fuel
rated stop cock to either side of the 500. I can now also stop fuel from escaping the filter whilst changing.