Kinsler Handbook #32 May 2025

Kinsler Fuel Injection, Inc, 1834 THUNDERBIRD TROY, MICHIGAN 48084 U.S.A. www.Kinsler.com Phone (248) 362-1145 Fax (248) 362-1032 143 MECHANICAL FUEL PUMPS FOR EFI PUMP OUTPUT A mechanical pump’s output is close to linear with the RPM at which it is driven. Rotate the pump shaft twice as fast and the flow will double. However, even a good pump is affected by the clearances of the gears and the pressure at the outlet. The flows at very low RPM and very high RPM will be below the linear graph of the pump’s output due to internal leakage, caused by the side clearance required for the gears. This clearance leakage back past the gears has the same effect as a small bypass from the pump outlet back to the inlet. Mechanical fuel pumps are ideal for Electronic Fuel Injection for several reasons: 1. Flow output directly related to engine RPM - decreases demand on Pressure Relief valves throughout the rev range, especially at idle 2. No electric draw - decreases demand on electrical system 3. Fuel compatibility - coated internal pump parts resistant to methanol corrosion; many electric pumps aren’t 4. Fuel pressure - some mechanical pumps are capable of 300+ P.S.I. 5. Weight REQUIRED PUMP SIZE The horsepower and the fuel being used will dictate the required pump size. Pump Model Maximum pump shaft speed (RPM) Minimum inlet fititng size #200-#250 7,000 8 AN #300 6,000 8 AN #400 through #500 6,000 10 AN to 12 AN #550 6,000 12 AN #600-#700 5,000 12 AN #900 through #1300 5,000 16 AN We test and rebuild many types of pumps. To have your pump tested, send it in with all the fittings still in it. Include a day and evening phone number with the area code.....so we can call if we need info. ALL SIZES, FLOWS , AND RECOMMENDATIONS FOR FUEL PUMPS ARE FOR GENERAL REFERENCE. CALL US FOR YOUR SPECIFIC APPLICATION !!! © 2021 For more mechanical fuel pump info., see Pg. #105-110, for Pump drives, see Pg. #181-186 Christian Kuhn’s 68’ Mustang powered by a 4.6 liter small block Ford with EFI KINSLER PUMP SIZES / FLOW RATES WITH GASOLINE FLOWS ARE TYPICAL OUTPUT - ACTUAL OUTPUT WILL VARY SLIGHTLY PUMP RPM PSI TP-200 TP300 TP-350 TP-400 TP-450 TP-500 TP-700 TP-800 2000 5 337 508 588 671 757 839 1170 1310 2000 50 324 489 552 654 744 820 1159 1301 3500 100 549 843 949 1122 1275 1416 2007 2263 PUMP RPM PSI TP-900 TP-1100 TP-1300 TP-1600 TP-2300 2000 5 1574 1903 2241 2000 50 1543 1877 2227 2705 3981 3500 100 2660 3250 3875 4740 6887