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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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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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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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