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into many tanks can be made in the access/ sender cover plate. Bulkhead fittings sealed with Earls Stat-
o-Seals on both sides can make installation easier in many cases. We recommend 3/8 or AN-6 return
fittings and lines.
Fuel Filters
We provide either a large single or 2 smaller filters (40 micron)
to be mounted before the fuel pump module plus one small
filter to be mounted between the pumps and fuel block, usually
on the firewall. Note the arrow for flow direction. Ports are ¼
NPT. Fittings supplied are AN6. Secure with the provided Adel
clamps.
All fuel tanks should have screen type finger strainers on the
fuel feed lines and/or 35-50 micron filters between the tanks
and the pump inlets 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. Check at 10 hours initially.
We recommend turning the fuel pumps on and listen to the tone prior to engine cranking. Establish what
the normal noise of the pumps is. Any increase in noise may mean that the fuel filters are clogging and
restricting flow to the pumps. Investigate before flight.
On the pressure side of the pumps, always be sure that any filters used are rated to at least 100
psi. Use 3/8 lines and 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 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
Duplex fuel selector
Fuel Pump Cover
We supply a fuel pump plate to cover the hole where the old mechanical fuel pump was mounted. Seal
this with RTV before bolting in place. If you have the engine apart, you can leave the fuel pump drive rod
out (Lycoming), as it’s not required with the electric EFI fuel pumps.
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