Re: 4 CYL GM dies after running 30-45 Min
OMC Stringer<br />I would have done exactly what you did as sounds like a fuel pump. I guess I would also check the fuel filter or better yet replace the fuel filter at the carburetor fuel line input. Make sure your crank case vent open and Flame aresstor not plugged up.<br /><br />Lots of stuff you could check but probably better to isolate problem first. To run need Fuel air mix, proper timed spark, and compression. I would start testing out on the water.<br /><br />First when it fails take off the fuel fill cap to make sure it is not a fuel vent. <br />Next I think I would put a timing light on and go on a test run to see if light still flashing when it fails. You can actually check the timing mark and note position when working ok then check again while failing. At WOT will probably be off the degree wheel. This should tell you if got a bad Coil, Dist Cap, Points, condensor, Rotor, or water in dist cap.<br /><br />Are you sure you put in the new fuel pump? Hook up a fuel pressure gage between the fuel pump and the carburetor and make sure pressure at least 4 PSI. Could also hook up a vaccum guage on the fuel pump input should have no real suction. Could be plugged fuel pickup screen in tank. Be careful of fuel leaks when checking fuel pump input or output. Any chance you have added a fuel pick line for a Kicker motor where fuel pump could be sucking air or a loose fuel hose between tank and fuel pump? A small leak in fuel line where it comes up to fuel pump?<br /><br />If you check your fuel pressure and spark while it is failing should have a idea which way to go.<br /><br />Make sure come back and tell us what fixes it.