A quantitative deficiency exists as defined by the Naval Ships Logistics Center whereby half of the 200,000 supported hull, mechanical and electrical Applied Parts Lists, (or APLs) representing installed equipment, have a population of 5 or less. A 5% yearly growth indicates support costs will be in excess of $300M. With pumps being the largest supported equipment area, a rationale exists for exploring lifecycle cost savings for a standard Navy positive displacement pump. A systems engineering approach for selection and demonstration of life-cycle cost savings of two proposed Navy positive displacement pump cases modeled against status quo is presented at the concept level leading to an optimum. The approach begins with a literature search, followed by data and cost figures derived from current and projected fleet profiles of Naval Ships Logistics Center and Ship Parts Control Center maintained data bases and cost models with a rule-book developed herein for consideration of mission needs with regard to time. FY92 program results indicate: 2200 different positive displacement designs were installed aboard 540 ships; identification of 3- pump group regions; regions bounded by 0-250 psi and 0- 460 gpm account for 64% percent of all pump APLs; $84.1M potential acquisition savings is proposed for summation of those pumps in the 64% range over a 20-year time span. From the FY92 data, two of the best possibilities are selected and modeled over a 35-year life cycle. A payback period for a proposed 50 and 200 gpm design is 7 and 11 years for baseline dollars and 7 and 13 years with 5% discounting. A 50 gpm concept is selected based on shortest payback time and logistics-based ranking factors. For academic purposes, a potential for standardization exists.