1959 18hp johnson fuel lines

oldfe

Cadet
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Jul 4, 2015
Messages
19
I have a motor that has 2 fuel lines one to pressure the tank one for fuel is it possible to install a fuel pump and just go with one fuel line, or any idea how to convert to just one line.
 
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racerone

Supreme Mariner
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Dec 28, 2013
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The pressure tanks are very well built / reliable / safe / easy to repair / parts are available.-----I would rely on one far more than some of the cheap plastic junk made today !
 

Crosbyman

Vice Admiral
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Nov 5, 2006
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5,024
this is a more than frequent question !!!

An easy job if you do not want to keep the motor in original condition

you need...
- a single line side connector to replace the dual one
- you either use the converted air pressure nipple behind the carb to get vacum pulses to run a 3 legged pump
-or get a side cover plate with the necessary mounting holes to install a pump and directly use vacum pulses from the the crankcase
- or.. you shape a plate over aside cover port and mount the pump on it


http://www.leeroysramblings.com/Converting_dual_fuel_line.htm

https://www.bing.com/videos/search?...A184CFE191F90B844B94A184CFE191F90B8&FORM=VIRE

https://www.bing.com/videos/search?...FA10E855583C29D3DF8CFA10E855583C29D&FORM=VIRE

https://www.youtube.com/watch?v=FtG4M7ye1N8&t=40s


you can get cheap omc square pumps on e-bay or amazon (30$) or even cheaper 3 legged Briggs Straton pumps for 10$

all methods worked fine on mine but a pump over the side cover plate is the better way to go . you can find side cover plates with pump mounting hole already made if you go that way just plug the side air nipple behind the carb with a short piece of hose a fat screw and tie wrap.
 

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tomhath

Master Chief Petty Officer
Joined
Dec 5, 2007
Messages
814
Those 18hp motors need plenty of fuel when running wide open. If you convert to a pump be sure it's rated for a motor that size.
 

racerone

Supreme Mariner
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Dec 28, 2013
Messages
36,306
?-----Even the little square pump used on the 4 hp models is used on the 25 hp 22 cubic inch models.----You can not tell pump capacity by physical size.
 
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