Posted by jackinok on November 18, 2011 at 09:20:58 from (162.58.82.136):
In Reply to: Fuel pump ? posted by j hikemper on November 18, 2011 at 06:43:49:
on my old JD mower i changed the filter once with one not made for gravity feed and it air locked it some how. I never did understand why. Also its possible you have a stopped up filter thats plugged and if you blow air through it the oposite way it will go through but stops right up again when you stop blowing on it. Ive seen that happen also. I did put one of those vacumn pumps on a old johnson out board,that used to have a presurized tank. Installed a clear filter at the same time and it never fills. When engine is running you can see gas pulling through filter, but i think since those pumps only pull what engine needs since they run off vacumn, they dont really have enough flow to fill the filter. It very could be that may be your case and that you have a bad diaphram in pump. You may get a indication from tank itself. If its mounted low enough gas wont flow up of course ,or if it pulls out of top of the tank it could do this. Another thing to check would be the fuel cutoff in bottom of carb. Almost all this newer stuff has a solenoid there that cuts fuel off. If thats bad you could run engine by feeding fuel thru carb throat,but it cant move gas through bowl of carb. Since they have a diphram pump of course if fuel is not flowing out it wont suck any in from tank. There is no bypass back to tank and so filter would never fill. Needle /float in carb will give the same indication. If it were mine i would pull bowl off carb,and crank it. If i got no fuel flow i would think needle and seat or fuel pump. If it did have fuel flow then,i would strongly suspect the fuel cutoff solenoid,or something in its control circuit. My opinion of course.
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