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Bertram31.com General Bulletin Board
Re: Port engine mystery
Posted By: Vic Roy In Response To: Re: Port engine mystery (phil kindla)
Date: Thursday, 26 May 2005, at 8:50 p.m.
Walter, agree with Phil. It pretty much has to be an air leak on the vacuum side. If the gasket on the engine mounted spin on was leaking, it would squirt fuel since it's on the pressure side of the lift pump, so let's look between the tank and the engine lift pump you just changed. All the vacuum side fittings are suspect as are the hoses.. As is the Racor. Remember that little O ring under the T handle, and of course the big O ring under the cap.
Also suspect the fuel shut off valves on the suction side, could one have a bad seal? Then let's think about the fuel pickup tube in the tank itself. We all know the originals will split sometimes along the verical solder line. Why you say, could a split in the tank pickup cause just one engine to suck air and not the other? You could have such a small split feeding air that one side, by virtue of a less complex hose system could have more vacuum "suck" than the other. On AJ my port Racor always clogs before the stb, with both new at the same time.
Sooooo, as I know you will, apply logic from pickup to output side of the lift pump looking for a vac. leak. All the lay-up drain down problems you hear about thru the injector pump and the return line would not seem to be relevant to it air locking while running. Gotta be a vacuum side leak.
On my old B25 when it had gas engines, I had a fuel starvation problem on both engines that almost drove me nuts. Pumped the tank, etc. It finally turned out to be vacuum leaks in crimped on fittings in BOTH short rubber fuel lines from the copper lines to the engine lift pumps. Usually on twin engine boats we use the good running engine to diagnose the offending one. My money is on a vacuum leak, as simple as a hose fitting.
UV
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