The Early Model Lycoming Fuel Pump
(40174/40295 low pressure, 40595 medium pressure, 40296 high pressure)
In the spring of 1964, AC introduced the first dual diaphragm type fuel pumps. These pumps were the first models to incorporate the oil seal integral with the upper diaphragm and a separator ring for installation of the vent / overboard drain line. These pumps are characterized by a rocker arm which is an early riveted, laminated design. Current production in Lycoming pumps will not fit some pre-1978 applications without expensive modifications. You can eliminate the need for these modifications by ordering an FAA Approved overhauled early model pump for direct replacement.

The Late Model Lycoming Fuel Pump
During August of 1978, AC introduced what is now known as the "late model" fuel pump which has a "channeled" rocker arm. This pump is taller than the early laminated arm pump and has a unitized diaphragm assembly. Because of its increased size some pre-1978 model aircraft require expensive and time consuming modifications to carburetors or accessory housings (ref: Lycoming Service Inst. No. 1110C). These modifications are not required if our smaller, early model laminated fuel pumps are installed on your aircraft.

Download Tempest Fuel Pump Application Chart for Lycoming PDF

OVERHAULED LYCOMING FUEL PUMPS

All internal parts are replaced with new certified parts. The actuating arms are magnetic particle test inspected; cast parts are inspected for wear, corrosion and cracks. Bboth the older laminated and newer channel style fuel pumps are overhauled for normally aspirated, pressure carburetor, and fuel injected systems.

All remanufactured parts come with an associated core charge or core deposit. The "core" is the part that is remanufactured and brought back to specifications. When you buy a remanufactured part, you can send your current part to us as a "rebuildable core". When we receive your core, it will be sent back to the manufacturer, who will verify that the core is rebuildable. The core charge will be refunded once it passes inspection. We are obliged to charge 5 € per kg for freight to the manufacturer, customs fee 4% and credit card fee 3% (only if you paid by credit card) on your credit. No partial credit is given on bad cores. Although our goal is to exchange your core for our remanufactured part, you can order a remanufactured part without having a core.

Cores must be complete, fully assembled and in rebuildable condition in order to receive core credit. All cores must be returned in the original manufacturer's box. Cores returned must be the same as the unit sold, no cast iron cores accepted.

The customer is responsible for the return of the core. The cores shall be packaged carefully for return in order to protect the core from shipping damage. Our company cannot be held responsible for any shipping damage.

Cores can be returned using your original invoice number as the return authorization number. Write the return authorization number (upon request) on the outside of your package and include a copy of your original invoice.