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Return line (lower) using Earls Stat-o-seals
Fuel Selector
On any system using more than one fuel tank, we recommend using a Duplex selector which has a
feed and return port for each tank. This ensures that returned fuel always goes to the selected tank
which prevents pumping fuel overboard. Andair makes a wide range of Duplex type selectors.
Andair Duplex fuel selector
Fuel Filters
All fuel tanks should have screen type finger strainers on the fuel feed lines and/or 40-50 micron filters
between the tanks and the pump inlets. We supply a large 40 micron filter for the pump inlet and
smaller 40 micron one for the pump discharge. Be sure to check the filters annually. On new build
aircraft, construction debris can clog filters leading to pump damage or a loss of fuel flow
which can cause a partial or complete power loss.
On the pressure side of the pumps, always be sure that any filters used are rated to at least
100 psi. and use 3/8 lines or AN-6 fittings.
Gascolators
We don’t recommend the use of gascolators with our EFI systems as they serve no useful purpose
with a high pressure return type fuel system. If regulations require them, best to install them on the
high pressure side between the pumps and injectors and use them as filters. Be sure gascolators
are rated to at least 100 psi.
Fuel injector Mounting
Your kit may provide either steel or aluminum base injector bosses which must be welded onto your
induction tubes in most cases. The injectors should be mounted as near as possible to the intake
ports, pointed towards the valve. Be sure when determining placement, that you can run fuel lines and
fitting to the boss tops which won’t be too close to exhaust pipes or any other obstructions. Be sure
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