Re: 1958 Bigtwin 35 Evinrude
Hi Dmac<br />As Paul suggests rebulid your fuel line connector. This makes a world of difference in how these motors run. You don't say how bad your fuel economy is. But we must understand that in the 50's gas was not a problem. Those old 35hp drink a lot of fuel. On a 14' runabout with a full load, you will be lucky to get 20 mi. to a six gal. tank at full throttle. That is about six gal. per hour. A good day of water skiing will take 2-3 tanks. Some things to do to get the best milage you can are, make sure your high speed needle is adjusted correctly and the float in the bowl is set correctly, Repair all air and fuel leaks. Make sure the choke opens fully and stays open. Presure tanks if maintained and used for there intended use, and operated by a reasonably compendent person are safe. They operate on a very low presure, they have an over presure valve (for some reason). I have never heard of nor seen one blow up. There may have been situations where fire was envolved. Probably caused by the operator smokeing while using the gas can as a boat seat. It is possible that this system if left presurized while not in use could leak fuel into the bilge (for a short time) it could be enough to cause a problem if a sorce of ignition were provided (a ciggy?). This type thing can happen with the moderen system as well (compendent operator). To solve this, just crack open the gas cap and relieve the presure. The tough thing with this system is to keep the presure up, not over presure. If you keep your o-rings in good shape and maintain the tank you should have no problems. Just curious, you say your motor starts right up and runs good. Why do you ask about replacing the top main seal? Do you have fuel/oil all over the top of the motor under the flywheel?
