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Discussion Starter · #1 ·
25 johnston 1974......have to pump ball to keep running, sometimes not at all, other times veryhard and constant. i replaced tank, lines ball, and gas connectors. still no fix.......is it possible that the float in the carb is made of cork and a little piece of it came off and is jamming up????its driving me nuts, any help would be awesome. thanks
 

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QUOTE(burton13 @ Jun 27 2009, 10:26 AM) <{POST_SNAPBACK}>25 johnston 1974......have to pump ball to keep running, sometimes not at all, other times veryhard and constant. i replaced tank, lines ball, and gas connectors. still no fix.......is it possible that the float in the carb is made of cork and a little piece of it came off and is jamming up????its driving me nuts, any help would be awesome. thanks

You might have a crack in the diaphram inside the fuel pump. It's a cheap fix to get a new diaphram, check valves & gaskets.
 

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QUOTE(Zib @ Jun 27 2009, 09:53 AM) <{POST_SNAPBACK}>QUOTE(burton13 @ Jun 27 2009, 10:26 AM) <{POST_SNAPBACK}>25 johnston 1974......have to pump ball to keep running, sometimes not at all, other times veryhard and constant. i replaced tank, lines ball, and gas connectors. still no fix.......is it possible that the float in the carb is made of cork and a little piece of it came off and is jamming up????its driving me nuts, any help would be awesome. thanks

You might have a crack in the diaphram inside the fuel pump. It's a cheap fix to get a new diaphram, check valves & gaskets.


cool..thanks, ill give her a look
 

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I was going to suggest that also. I had the same problem with my old 85 horse Evinrude, new diaphragm, no more sore fingers. Super easy to do and should be maybe 10-20 dollars at most, good luck.
 

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yes i agree it is the diaphram in the fuel pump had same problem on my merc and now it holds the gas at all times and starts right up.
 

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some thing else you might want to check is the vacuum line going to the fuel pump if it is leaking at all it will not make the diaphragm work properly
 

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make sure the ball you are using is not a cheapie from meijers and actually a evinrude/johnson ball, and that all your clamps are the right size and not sucking air, to me its either the wrong ball or bad clamps and your sucking air.
 

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doubleD i had a problem with my fuel line with the clamps but it was leaking fuel as appose to sucking air but that was only one of the problems i found on my motor but your right about a cheap ball and it sounds like he changed it after the problem started. just mt .02 worth

i believe that on a 1974 motor the float is aluminum or synthetic i know on my 64 it's synthetic
 
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