Re: 81' Mariner 5hp runs for 5-10 seconds and pukes
It can be maybe 3 things. (1) fuel problem. That black square thing is the fuel pump. Its always a good idea to rebuild that thing, wont run over about $4.00. All you need is a diaphram kit.Make sure that the fuel system inside that pump is clean, even on the engine itself. Look for a tar gummy type stuff clogging ports. <br /><br />Another thing is your fuel system might be taking on air somewhere. Check for any fuel leaks from the fuel tank to the carborators. If your fuel lines dont have any hose clamps on the ends of them, add them, and tighten them good. Also, if you do rebuild that fuel pump with a new diaphram kit, take the fuel line off going to the carborators while someone engages the starter to see if the fuel pump is pumping fuel with a good bit of force.<br /> It would also be a good idea to take your carborators apart to look for any sighns of trash in them. take your needle out from under your floats and blow on the fuel inlet where the fuel line goes. If you cannot blow air through there, you got trash in your carb and no fuel is getting to your carbs. It aint no thing to clean them out. While your at it, spray them things out with carborator cleaner and clean those things like you would a pistol, with a fine tooth comb.<br /> (2) Timing. If your motor's timings off, that can be causing it to do that. You can check and set timing on almost any merc with a standard timing gun, but you have to have a shop manual to tell you what the timing is, and what to set.<br /> (3) Electrical. Disconnect one spark plug at a time while someone engages your starter. Hold the plug wires close to the engine and look for a spark.<br /> Before you perform any major maintenance, I advise you to have a good shop manual that covers your motor, a clean and cool working environment, proper tools, patience, and a case of beer. Good Luck
