How the Primer Bulb Works on a Briggs & Stratton 5 Horse Engine. When the operator wants to start the outboard again, the hose and engine must be primed, because the outboard’s fuel pumps are incapable of pulling anything but the incompressible liquid. Boat Primer Bulb. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. FREE Shipping on orders over $25 shipped by Amazon. The check valve may be stuck. You can squiz a whole lot more than that with the bulb. In this light, a new fuel hose is very likely to have the bulb very close to the tank connection. 1-1 of 1 Results. If the new bulb does not solve the gas issue, check the spin on gas filter and the little gas filter on the motor. Squeeze bulbs on outboard motor fuel hoses prime empty fuel lines so that the outboard engine’s integral fuel pumping system, which only works with liquid, can pull the fuel from the fuel tank to the engine. Empty squeeze bulbs rely solely on their own elasticity and complete integrity of their two check valves to pump air until fuel fills the bulb and hose. Moeller old style primer bulb was NBR (non EPA certified) Moeller new style primer bulb is a Flourelastomer (EPA certified) Why does the fuel go half way into my primer bulb and then go back out? If that does not work, run the motor from a small external tank. When the primer won't prime, the engine won't run. So, while the motor runs great, it's possilbe to not get a firm bulb. But blockages don’t cure themselves. Boat Engine Stalls When Accelerating. Toggle navigation. FREE Shipping on orders over $25 shipped by Amazon. Does this mean that I have an air leak in the fuel line? First, check the bulb for aging, loss of elasticity, or cracking. The primer bulb on a Briggs and Stratton 5 horsepower engine is located on the back of the air filter assembly next to the carburetor. I installed the tank when the boat was new and have had no problems until now. Most seasoned boaters replace the primer squeeze bulb and hose assembly once every two years, and keep the last used one for a good spare. Yesterday, while working on the boat in the driveway, I noticed that the primer bulb was not hard so I squeezed it a few times to fill it with fuel. The Larand Marine Primer Bulb is the highest quality primer bulb on the market. The carburetor is a part of the engine that mixes fuel and air together to make a combustion. Tap the bulb to see if that resolves the issue. Air is compressible and has its own spring rate that tends to minimize the capability of the bulb to pull on its expansion part of the cycle. If fuel still refuses to flow, new aftermarket replacement squeeze bulb hoses are inexpensive and easy to integrate into the existing fuel system. Order Primer Bulbs for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. Therefore, the bulb must be squeezed repeatedly until the entire fuel hose is full of liquid fuel again. 4.1 out of 5 stars 47. Use your finger tips and thumb to collapse the bulb while priming your engine. Last fishing excursion my outboard starting to act up and not pump constant fuel. FILTER RESULTS. So I started the whole process of elimination of checking the primer bulb and hoses. Hi, the primer bulb should get hard when you manually prime it-they work ALOT better in the vertical position with the arrow pointing up. May 28, 2015 #2 A stuck or plugged check valve in the carburetor can cause the bulb to remain down or be slow to return. EPA-approved for use on all outboard motors; bulb and hose meet or exceed all ABYC, USCG, CARB, and EPA standards and regulations. Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. 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