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Click here for Installation Schematic How this Pre-Oiler & Back-Up Oil Pump works — when you turn your Master Switch ON, the Electric Oil Pump turns ON, sucks oil out of your oil pan, and pressurizes your Engine Oil Pressure to about 20 to 100 PSI (depending on pump version) *before* engine start, Pre-Oiling the entire engine — remember, 87+% of engine wear for ANY engine is from just simply starting the engine because of bare metal to metal contact. It only takes about 15 PSI to pre-oil an engine, so after you see about 15+ PSI on your Oil Pressure Gage ( which only takes about 18 to 30 secs depending on your engine — I would let it run about 1 minute ), THEN start your engine. When the Engine Driven Mechanical Oil Pump catches up ( when it reaches above ~55 PSI ), the Electric Pre-Oiler Pump automatically shuts OFF via the Oil Pressure Switch ( see schematic ). And if the Engine Driven Mechanical Oil Pump were to ever fail ( which does happen all too often ), the Electric Pre-Oiler Pump automatically comes ON as an Electric Back-Up Oil Pump because of this Oil Pressure Switch. You can also use the Oil Pump to keep your engine lubed during construction, when down for maintenance, or during long down times of not flying. You could even have an external power supply and a timer turn it ON to keep your engine lubed during a vacation trip or during maintenance periods just like you do for the battery when you are away from the engine.
You are already flying with 2 spark plugs, 2 ignition systems and 2 fuel pumps, sooo why are you flying with just 1 oil pump?!? Why seize your $40,000+ engine and / or crash your Pride and Joy *just* because your Engine Driven Mechanical Oil Pump fails?!?!? And just because it’s never happened to you before doesn’t mean it won’t! Besides, it saves on engine wear every time you start the engine — ANY engine. Also, you can keep your engine Pre-Oiled during construction, during non-flying/maintenance times, and when you go on vacation via a timer!
The FAA says because the pump is an external installation and a minor modification, a 337 is not required — just make a log book entry. Our pumps are used in many military vehicles, too.
Wondering which Pre-Oiler / Back-Up Oil Pump to choose ( pump details subject to change without notice ) ?
The average distance between airports in the USA is only 15 sm, except in the mountains. The 3+ lb. GP-301 Intermittent Duty model could probably be considered Continuous Duty for aircraft because it should work just fine running for several hours straight as a Back-Up Oil Pump. And it will eventually pump very cold oil at start-up in very cold climates, too.
BUT, if you are operating over the mountains a lot, and / or operating in cold weather a lot, and / or flying over the water a LOT, and / or flying over wooded areas a lot, I *STRONGLY* recommend the GP-302 or GP303 model [ they are just 3+ lbs. or 6+ lbs. more than the GP301 — take the few extra lbs. of weight off of yourself 🙂 ] :
A Few Definitions:
VDC = Volts Direct Current ; PSI = Pounds per Square Inch ; GPM = Gallons Per Minute ; LPM = Liters Per Minute ; AMP = Amps or Current ; CB = Circuit Breaker ; N.O. = Normally Open ; N.C. = Normally Closed ; S & H = Shipping and Handling ; CA = California
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GP301-12L – 12 VDC / ~20 – 30+ PSI / 2.0 GPM – 7.95 LPM / 10 AMP CB / installation / weight 3.375 lbs. / fittings that come with the pumps are CUSTOM length 3/8″ BSP with O-ring going into the pump, and 3/8″ NPT male threads on the other end with a 0.432″ ID. If you want a custom 3/8″ BSP x 1/2″ AN-8 x 0.395″ ID fitting on the pump, or Barb Fittings, they are only $26.71 / $27.77 cc extra each. Gear Pump for use as a Intermittent Duty Pre-Oiler and Back-Up Oil Pump; or for the transfer of Lube Oil, Diesel Fuel, Antifreeze and Water; bronze gears / stainless shafts, brass pump body with lip seal. The pumps are self priming up to 5 feet — even more for oil. Squirt some oil in the gears before first using the pump. — $385.51 each via cash, check or money order / $400.93 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
GP301-24L – 24 VDC / ~20 – 30+ PSI / 2.0 GPM – 7.95 LPM / 7 AMP CB / installation / weight 3.375 lbs. / fittings that come with the pumps are CUSTOM length 3/8″ BSP with O-ring going into the pump, and 3/8″ NPT male threads on the other end with a 0.432″ ID. If you want a custom 3/8″ BSP x 1/2″ AN-8 x 0.395″ ID fitting on the pump, or Barb Fittings, they are only $26.71 / $27.77 cc extra each. Gear Pump for use as a Intermittent Duty Pre-Oiler and Back-Up Oil Pump; or for the transfer of Lube Oil, Diesel Fuel, Antifreeze and Water; bronze gears / stainless shafts, brass pump body with lip seal. The pumps are self priming up to 5 feet — even more for oil. Squirt some oil in the gears before first using the pump. — $385.51 each via cash, check or money order / $400.93 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
GP302-12L – 12 VDC / ~30 – 40+ PSI / 2.1 GPM – 7.95 LPM / 15 AMP CB / installation / weight 6.1875 lbs. / fittings that come with the pumps are CUSTOM length 3/8″ BSP with O-ring going into the pump, and 3/8″ NPT male threads on the other end with a 0.432″ ID. If you want a custom 3/8″ BSP x 1/2″ AN-8 x 0.395″ ID fitting on the pump, or Barb Fittings, they are only $26.71 / $27.77 cc extra each. Gear Pump for use as a Continuous Duty Pre-Oiler and Back-Up Oil Pump; or for the transfer of Lube Oil, Diesel Fuel, Antifreeze and Water; bronze gears / stainless shafts, brass pump body with lip seal. The pumps are self priming up to 5 feet — even more for oil. Squirt some oil in the gears before first using the pump. — $606.68 each via cash, check or money order / $630.95 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
GP302-24L – 24 VDC / ~30 – 40+ PSI / 2.1 GPM – 7.95 LPM / 10 AMP CB / installation / weight 6.5 lbs. / fittings that come with the pumps are CUSTOM length 3/8″ BSP with O-ring going into the pump, and 3/8″ NPT male threads on the other end with a 0.432″ ID. If you want a custom 3/8″ BSP x 1/2″ AN-8 x 0395″ ID fitting on the pump, or Barb Fittings, they are only $26.71 / $27.77 cc extra each. Gear Pump for use as a Continuous Duty Pre-Oiler and Back-Up Oil Pump; or for the transfer of Lube Oil, Diesel Fuel, Antifreeze and Water; bronze gears / stainless shafts, brass pump body with lip seal. The pumps are self priming up to 5 feet — even more for oil. Squirt some oil in the gears before first using the pump. — $606.68 each via cash, check or money order / $630.95 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
GP303-12 – 12 VDC / ~101 PSI / 5 GPM – 18 LPM / 25 AMP slow blow CB / installation / weight 9.5 lbs. / fittings that come with the pumps are CUSTOM length 3/8″ BSP with O-ring going into the pump, and Barb Fittings on the other end with a 0.432″ ID. If you want less PSI, use a PWM DC Motor Speed Controller to slow the motor down by adjusting the AMPS to the PSI you want. If you want a custom 3/8″ BSP x 1/2″ AN-8 x 0395″ ID fitting on the pump, they are only $26.71 / $27.77 cc extra each. Gear Pump for use as a Continuous Duty Pre-Oiler and Back-Up Oil Pump; or for the transfer of Lube Oil, Diesel Fuel, Antifreeze and Water; bronze gears / stainless shafts, brass pump body with lip seal. The pumps are self priming up to 5 feet — even more for oil. Squirt some oil in the gears before first using the pump. — $685.69 each via cash, check or money order / $713.12 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
GP303-24 – 24 VDC / ~101 PSI / 5 GPM – 18 LPM / 20 AMP slow blow CB / installation / weight 9.5 lbs. / fittings that come with the pumps are CUSTOM length 3/8″ BSP with O-ring going into the pump, and Barb Fittings on the other end with a 0.432″ ID. If you want less PSI, use a PWM DC Motor Speed Controller to slow the motor down by adjusting the AMPS to the PSI you want. If you want a custom 3/8″ BSP x 1/2″ AN-8 x 0.395″ ID fitting on the pump, they are only $26.71 / $27.77 cc extra each. Gear Pump for use as a Continuous Duty Pre-Oiler and Back-Up Oil Pump; or for the transfer of Lube Oil, Diesel Fuel, Antifreeze and Water; bronze gears / stainless shafts, brass pump body with lip seal. The pumps are self priming up to 5 feet — even more for oil. Squirt some oil in the gears before first using the pump. — $685.69 each via cash, check or money order / $713.12 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
0166-408 – 12 or 24 VDC ( same switch ) weighing only 2.6 oz ; factory pressure set at 55 +/-7.25 PSI, adjustable via a set screw in the bottom of the switch (see left pic); N.C. diaphragm Pressure Switch with an adjustment range of 14.5 PSI to 145 PSI so you can custom set your Pressure Switch for your minimum engine oil pressure, with a maximum press of 4350 PSI, that has a 1/8″ male NPT with zinc plated steel body. Oil Pressure Switch function is to turn the Pre-Oiler OFF when your engine oil pressure from your engine driven mechanical oil pump reaches minimum operating pressure, and turns ON the Pre-Oiler as a Back-Up Oil Pump if the engine driven mechanical oil pump ever fails and the engine oil pressure drops below ~60 PSI ( for example, or whatever you set for your minimum engine oil pressure ) — $70.00 each via cash, check or money order / $72.80 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
633-1905 – ON / OFF / ( Mom ON ) SPDT Lever-Lock Toggle Switch to by-pass the Oil Pressure Switch and operate the Pre-Oiler and / or Back-Up Oil Pump independently, if necessary. This switch is not just another toggle switch, it’s a Lever-Lock Toggle Switch, which means you can not bump the switch into the ON position like you can with other standard toggle switches — $15.00 each via cash, check or money order / $15.60 each credit card price ( BUT, we prefer checks ), plus S & H , and CA Sales Tax ( if you live in CA ).
