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Fuel Pressure Regulator
We supply either an adjustable Borla regulator with AN-6 fuel fittings or a non-adjustable OEM type with
O-ring sealed inlet and either barb outlet or 1/8 or ¼ female NPT outlet fitting. We recommend the
adjustable type have its fuel pressure set to 45 psi using the adjusting screw on the top of the regulator
with the engine not running. Both regulator types have a MAP reference hose port for connection to
intake manifold vacuum. Using other unproven regulators is not recommended as failure can cause
partial or complete power loss. The adjustable regulator should be rigidly mounted to the firewall. The
plug may be removed on the Borla regulator for tapping off fuel pressure. Threaded mounting holes are
1/4NF.
Non-adjustable and AN6 adjustable fuel pressure regulators
Fuel Pumps
We recommend using only the supplied/ recommended genuine Walbro/ TI pumps to ensure maximum
reliability and safety with regards to re-priming in the event of a dry tank condition and to be sure they are
properly matched to the hp of your engine. The use of other brands is not recommended as failure
can cause a partial or complete power loss condition.
We can supply either a single pump or dual pumps mounted in a module to allow easier plumbing and
mounting. Be sure to follow the safety/ assembly instructions that come with the pump modules.
Improper fitting assembly can cause line or pump blockage, leading to a partial or complete
power loss. Dual pumps should have separate power feeds, breakers and ground points for maximum
redundancy. Fuse each pump with a 15 amp fuse or breaker. Nominal current draw is between 4.5 to 5.5
amps each at 14V, running at 45 psi pressure, depending on pump model.
Dual fuel pump module
On low wing aircraft, we recommend the pumps be mounted
as low as possible on the floor, preferably parallel to the floor.
If you must mount the pumps vertically, mount them with
the outlets facing UP, never down. Inlet lines to the pumps
should be 3/8 inch or AN6 with a minimum number of fittings
used. We recommend not using any 90 degree fittings if
possible on the pump inlets. Pump inlets should preferably be
flooded by fuel at all times. It’s normal that pumps can be rotated in the housing. They float on dual O-
rings at each end of the frame.
Be aware that the black pipe plugs are not sealed or tight. Permatex 56521 can be used to seal the
plugs.
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