![]() This has eliminated the need for anti-siphon valves. Nowadays, most manufacturers use shut-off valves on the water separators and have the lines above the top of the tank. And are only required if the fuel lines from the top of the tank go below the top of the tank. These valves are usually found on older boats built a few years back. To provide you with some clarity, for over a decade now, most outboard boats do not come with anti-siphon valves. The two most common sources for restrictions are going to be the anti-siphon valve and the bottom of the fuel tank pick up. There is another stalling issue when it comes to shifting, but we have another article that completely covers that topic here: Why Does My Outboard Engine Stall When I Put It In Gear? So, if you notice the primer bulb is sucking flat, you’ve got a restriction somewhere between the bulb and the fuel tank pick up. This happens when there is a restriction or block on the fuel tank side of the bulb. If you have a strong lift pump and primer bulb, you’ll notice that the lift pump will suck the primer bulb flat. If your boat engine continues to stall, we still need to cover the blockages issue.įuel line blockages or restrictions are usually a little more easily detected. The fuel tank pickup itself could also be corroded, or even broken. The fittings on the pickup could be corroded away. Keep an eye out for the following issues: We’ll move straight to the fuel tank pick up and see what’s going on there. In the event where the water separator or bracket isn’t the issue. ![]() This, in turn, doesn’t allow the system to prime up. This generates a hole in the bottom of it & leaks fuel into the bilge. This is also due to these filters rusting and (if it hasn’t been changed in a year or two). Water separators get dirty and can create a bad restriction in the fuel system. The most common source for an air leak is the water separator. Just remember: your boat may have these components in a different order. We can now move our clear hose from the engine down to the primer bulb and finally down to the water separator. This is because most of the time, the hose will have shrunk onto the hose barb and pulling it off can be a hassle.Ĭutting the tip-off of the connecting hose will make things easier for you! Boat Stalling Under Load? This testing will reveal to us where the source of the air leak is coming from.Ī good tip to keep in mind: Always check to see if you have extra fuel hose at whichever “station” you are checking next.Īs long as you do have some extra line to spare, we recommend that you cut the hose off of the hose barb using a utility knife. We want to test in front of each of these different components. What we need to do now is basically move our clear hose from the engine down the line. Once the fuel passes through the water separator, it then comes out the other side into a primer bulb or straight to the engine. Or, if your boat doesn’t have a selector switch, it should lead to a fuel water separator. Your motor could be losing power due to this issue as well.įirst, we’ll begin troubleshooting the air leak by using a piece of clear ⅜ inch hose. Between the pickup tube that is in the fuel tank, to the engine lift pump. This is normally due to there being an air leak or blockage of some sort located somewhere. And still, experience an engine running out of fuel. Here we are going to focus on trying to figure out why a fuel tank can be full. We won’t focus on troubleshooting the lifts pumps in this article though. Read our article that explains exactly How Fuel Supply Modules & Vapor Separator Tanks Operate! Mechanical fuel pumps are usually operated by either a diaphragm or crankcase pressure or an arm and a lobe on the camshaft.įor more information on lift pumps, FSM’s, or VST’s and this issue. And start the engine to see if the pump is moving fuel. ![]() And they are a little easier to work with.įor these pumps, you can simply pull the fuel hose off of the output side. We can even pull the pump off of the engine to bench test it!įortunately, the other style of pumps are mechanical fuel pumps. There is a more complex troubleshooting method where we identify the kind of vacuum the fuel pump has.Īt this point in troubleshooting though. If you don’t hear anything, check to see if the fuse is blown. And then listening to hear if the pump turns on and activates. Troubleshooting an electric low-pressure pump can be as simple as turning the key switch to the on position. Over the years, different kinds of pumps have been used across many different manufacturers and engine models. It’s important to remember that there are many different types of lift pumps.
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