— It’s the HEART of your marine engine’s FUEL SYSTEM!
TROUBLESHOOT YOUR FUEL PUMP WITH A SERVICE MANUAL
When troubleshooting engine issues, don’t forget about your FUEL PUMP, it’s the heart of your fuel system! Whether you have a 9.9 outboard or a 454 inboard the fuel pump is working continually and is equally critical to keeping your engine running properly. Ethanol fuel also takes its toll on the soft parts of any fuel system and requires you to be especially watchful. We stock SERVICE MANUALS for virtually all major makes and models of marine engine. Each contains valuable tips for troubleshooting your fuel pump and much more.
HOW TO FIND THE RIGHT REPLACEMENT FUEL PUMP
To find your replacement fuel pump, click on your ENGINE BRAND at this link. When a new page opens, type in the model number or serial number of your engine and look up your specific parts drawings. We carry ORIGINAL and AFTERMARKET fuel pumps in stock for most marine inboard engines and outboard motors. Some of the common types of marine fuel pumps are shown below.
Diaphragm Fuel Pumps are found on most of the two-stroke outboard motors in use today including Johnson, Evinrude, Mercury, Mariner, and Yamaha. The air pulse from the crankcase moves the diaphragm that pumps the fuel. They are easy to replace and easy to service. We offer Johnson Evinrude REPAIR KITS and Mercury REPAIR KITS as well as kits for most of the diaphragm pumps we sell. The correct pump and the repair kit will be shown with your PARTS DRAWINGS on our website.
VRO pumps were used on a variety of sizes of Johnson and Evinrude outboards from the mid 1980’s to the early 2000’s. The pump mixes the oil and gas automatically and eliminates the need to premix your fuel and oil. The term VRO stand for “Variable Ratio Oiler” which means the pump delivers a variable ratio of oil depending on the RPM. The original part numbers have been superseded multiple times, but we offer the most current pump for each model. There is no complete repair kit for the VRO pumps and OMC/BRP discourages service of the pumps, but we do have a kit that covers the Airmotor Side of the pump and one that covers the Fuel Side of the pump. There is no kit for the Oil Side. There is also a VRO Fuel Pump Conversion Kit that mounts up in place of the VRO but does not mix the fuel and oil. It requires you to premix your oil and fuel. Be sure to look up your engine model and check the JOHNSON / EVINRUDE DRAWINGS to find the correct pump.
Mechanical Fuel Pumps driven by the crankshaft were used on a wide variety of inboard and sterndrive engines including OMC, MERCRUISER, CRUSADER, VOLVO PENTA, and more. They are simple and reliable. There aren’t any service kits available for them, but they are inexpensive to replace if needed. Please be aware that marine fuel pumps are NOT the same as automotive pumps and you should never use an automotive pump in a marine application. The correct pump can be identified from the PARTS DRAWINGS for your engine. We stock ORIGINAL AND AFTERMARKET mechanical fuel pumps. Another good way to confirm the replacement mechanical pump you need is to look for the Flange ID and Inlet and Outlet Positions on your existing pump. Sierra Marine has a very useful guide in their catalog that references Flange ID to Part Number and shows the Inlet and Outlet Positions of the pumps they offer.
Electric Fuel Pumps were also used on a number of OMC, MERCRUISER, and VOLVO PENTA models. Some engines have a high pressure and a low pressure electric fuel pump. Be sure to determine which you need. Again, the best way to identify the pump you need is to look at your ENGINE PARTS DRAWINGS on our website.