1957 johnson 18 hp pushing water back into gas tank

[dredog]

1957 johnson 18 hp , i,ve rebuilt the carb , rebuilt the ignition , rebuilt lowerend , put new gas ,resealed the intake manifold , runs great,but i have water going back to the gastank thru the air hose that puts the pressure in the tank. i doubled checked everything, the gas is new,i was wondering if it could be the bottm seals or gaskets,i"d hate to tear it apart again. thanks.

 

[R.Johnson]

Re: 1957 johnson 18 hp pushing water back into gas tank

I don't really know how water could get in that hose. Splice a section of clear hose into the air line, and see if there really is water in that line.

 

[dredog]

Re: 1957 johnson 18 hp pushing water back into gas tank

thanks , yes i did that and even spliced a used fuel bowl in the line to collect what was coming out , its sort of a milky liquid, not alot but some, i was wondering if its just air that is suposed to come out or does it send back unused fuel under normal operation ?

 

[nwcove]

Re: 1957 johnson 18 hp pushing water back into gas tank

i was gravity feeding my 57 5.5 hp, with the air line disconnected, and it spit a quite a bit of fuel from that line, (previous owner attached longer lines to the carb and air line with quick connect fittings). with the motor just idling in a barrel i had to tie a container to the line to keep the mess/waste contained. not sure if its normal, but the motor runs even better now that i cleaned the pressure tank and am running it that way. the gas that was spitting from the air line was frothy, but when captured in a container it settled down and was just gas/oil.

 

[dredog]

Re: 1957 johnson 18 hp pushing water back into gas tank

thanks for the idea,i hadnt thought of gravity feeding it,i'll try it and hope it clears up,i'll let you know after i do this.

 

[nwcove]

Re: 1957 johnson 18 hp pushing water back into gas tank

yes, post back and let us know what you find out! catch some of the liquid thats causing concern in a clean clear bottle, allow it to sit awhile, if it is water it should separate from the fuel.

 

[dredog]

Re: 1957 johnson 18 hp pushing water back into gas tank

i ran it for awhile and collected about a quart of liquid , i let it settle and it was just gas and oil , the first few minutes was alot of junky looking stuff but it cleared up , it hadnt run for quite a long time , meaning decades , runs like a top now , thanks for all the help , now i'll service the 58 evinrude 18 and hit the river soon with both , again thanks.

 

[tmcalavy]

Re: 1957 johnson 18 hp pushing water back into gas tank

Convert it to a modern one-line fuel system with fuel pump.

 

[dredog]

Re: 1957 johnson 18 hp pushing water back into gas tank

i might convert one of these days but not this year,as long as they run good i wont touch them.