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Use caution tightening the nuts on the electrical terminal studs. Snug only. A number of people
have snapped these off.
Never place fuel pumps close to any hot engine parts unless they have proper heat shielding/
cooling.
We don’t recommend mounting pumps close to the engine due to fuel heating concerns. Inside the
cockpit is preferable.
Fuel Lines
Fuel lines from the fuel tanks to fuel selector and pumps may be rigid aluminum or steel tubing or Teflon
lined, stainless steel braided flexible hoses. Flexible hoses must have a conductive inner liner
designed to limit static electricity buildup when carrying gasoline.
Fuel lines between the airframe and engine must be flexible types of at least medium pressure rating
(over 100 psi burst strength). Never use rigid line between the airframe and engine which can lead
to vibration breakages and fire hazard. Never place fuel lines close to any hot engine parts
unless they have proper heat shielding.
Most installations will route fuel from the pumps to a fuel block, then use separate braided hoses to
connect to each injector boss. In this case, fuel from the pump enters on end of the block and return fuel
exits the regulator on the other end of the block. Other installations will use a rail or loop type system
where each injector is linked in series to each other. In this case, fuel from the pump enters the first
injector and Tee fittings on each injector boss routes fuel to each remaining injector in turn. The regulator
is placed after the last injector in the loop and fuel is returned to the selected tank through a Duplex fuel
selector or header tank in the case of many shoulder or high wing aircraft.
Fuel block with non-adjustable regulator Fuel block and template for rear baffle mounting
Top engine mount fuel block Return line using Earls Stat-o-seals
You must use fuel return lines with SDS EFI. Fuel return lines have little or no pressure present. Return
fuel should enter the tank(s) at least 4 inches from where the fuel feed exits. Installation of return lines
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