![]() If you have gasoline in the crankcase, you may have to change oil more than once to get rid of it. Once the line is pressurized, any leaks downstream of the diaphragm will appear. Instead you just pump the bail to pressurize the fuel line up to the float valve in the carburetor. It does not rely on electrical connections, and does not require an oil pressure safety switch, that you need to bypass in order to prime the fuel line. It has more suction, and can overcome small air leaks in the fuel line that electrical ones can't. ![]() The possibility of having gasoline in the crankcase from a leaking pump diaphragm is a serious issue, one of the reasons many prefer to use an electrical fuel pump but I think a mechanical pump has advantages over an electric one. I like to think the use of Marvel Mystery Oil in the fuel, and using non-ethanol fuel, has kept the diaphragm from degrading. I have a mechanical pump at least 2000 hours old, and it has never given me any trouble. Putting sealer on the rim of the diaphragm may not be the correct application. Your pump will no longer leak, and should last a long time. I would buy the rebuild kit and do the rebuild. So either the diaphragm has a crack, or the seal around it is suspect. If the drip really is from the mount gasket, you have gas in your crankcase. That is assuming your reassembly of the pump with gasket material and gasket sealer is sound, and the drip does not begin at the upper gasket area. You said it shows age and has cracks in the rubber it needs to be replaced. I think Neil is right, it's likely your diaphragm is bad. Don has helped verify my troubleshooting path for the intermittent shutdowns just a few days ago and I thank him for that, but before i bother him again I am hoping to realize some suggestions from the A4 community first. Any help would be greatly appreciated! BTW, I did not notice the drip until after diagnosing the fuel delivery issue and repeated cranks on the manual priming lever. Has anyone dealt with a similar issue? Will rebuilding the fuel pump with a moyer rebuild kit solve the problem? I am leaning towards rebuilding the pump anyway just to reduce future failure issues as the diaphragm shows some age and some slight surface cracking in the rubber, but I am more concerned with diagnosing the drip which seems to happen at about 1 second intervals. Or maybe the leak is somehow making its way past the screws and bolts that hold the pump together and mount it to the block. I am wondering if it is possible that the diaphragm itself may have a small lateral crack that is allowing fuel to get past the seal. Upon the last start up, I still have the fuel drip. I have since removed the pump and used some permatex high tack gasket sealer on both gaskets and the outside rim of the fuel pump diaphragm itself in order to solve the drip. I have replaced the gaskets with gasket material from the local auto parts store that is rated for gasoline and fuel pump mounting. I have successfully diagnosed a fuel supply issue causing intermittent shutdowns and now am having difficulty diagnosing a fuel drip dripping from the bottom of the mount for the mechanical fuel pump. I have learned alot about the A4 since the purchase. I have recently purchased a catalina 27 that has sat unused for a couple of years. My 100 hour was fairly clean (50 hours of use).New to the forum, new to the A4. Make sure you change the filters at the 10 hour service as they will likely have debris and contaminants from the engine build. The oil is nicely mixed and warm when I get home to extract it. I do oil changes at the end of a day of boating. ![]() Warm your oil before extracting to make it somewhat faster and easier flowing. I'm running Fram Toughguard 3600 filters as they're larger and filter better at 1/3 the cost. Yamaha filters are known to be cheap - search for one cut open and you'll see they're just basic pleated paper, nothing special except the Yamaha name on the side. I'm running Castrol GTX 10w40 which is an SP synthetic blend at half the cost. Search for the virgin oil analysis and you'll see it has nothing unique for watercraft. Click to expand.Yamaha 4W is nothing ain old conventional oil.
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