35 Johnson fuel pump question

[The_MilkMan]

I just got a 35 hp Johnson super sea horse. when i went to but the motor the guy started it on two pulls. ran great. now it wont start. it gets fuel to the carb, but when i squeeze the hand pump it starts running out the front of the carb. also, i looked on the fuel pump/filter, and it says fuel in, fuel out, and pressure. i asked my friend and he said that some pumps run off of vaccuum. when i unplugged the hose from the pressure side, i had fuel coming out when i pumped the hand pump. this doesnt seem right to me, but i figured i would ask since i dont work on these engines. does that seem right???

 

[bktheking]

Re: 35 Johnson fuel pump question

I just got a 35 hp Johnson super sea horse. when i went to but the motor the guy started it on two pulls. ran great. now it wont start. it gets fuel to the carb, but when i squeeze the hand pump it starts running out the front of the carb. also, i looked on the fuel pump/filter, and it says fuel in, fuel out, and pressure. i asked my friend and he said that some pumps run off of vaccuum. when i unplugged the hose from the pressure side, i had fuel coming out when i pumped the hand pump. this doesnt seem right to me, but i figured i would ask since i dont work on these engines. does that seem right???

As for the pump this may have been a conversion, what year or at least model is this motor? The late 50's model of that motor had dual line pressurized tank's and were subject to conversions.



You shouldn't have fuel coming out of the carb, if you do the needle isn't seating when the float rises, float level may be set too high. When you went to buy the motor had it already been running? What is your starting procedure from the motor.

 

[F_R]

Re: 35 Johnson fuel pump question

I just got a 35 hp Johnson super sea horse. when i went to but the motor the guy started it on two pulls. ran great. now it wont start. it gets fuel to the carb, but when i squeeze the hand pump it starts running out the front of the carb. also, i looked on the fuel pump/filter, and it says fuel in, fuel out, and pressure. i asked my friend and he said that some pumps run off of vaccuum. when i unplugged the hose from the pressure side, i had fuel coming out when i pumped the hand pump. this doesnt seem right to me, but i figured i would ask since i dont work on these engines. does that seem right???

Just so we are on the right track, the fuel in and fuel out fittings point downward and the pressure fitting/hose goes around the cylinder head to the other side of the motor--is that what you are saying?

If gas comes out the hose that goes around to the other side, the fuel pump diaphragm is ruptured. They have new ones here at iboats.

Now for the fuel coming out the carburetor. That should not happen and indicates a stuck or dirty float valve in the carburetor. But I have to wonder--just how much gas did you pump through the ruptured diaphragm??? It is within imagination that you pumped the engine full of gas and it is running out wherever it can. Nah, I can't imagine anybody doing that (did you?)

 

[tmcalavy]

Re: 35 Johnson fuel pump question

Super Sea Horse 35 hp...so I'm guessing early 60's on the model...or late 50's. That fuel pump runs off a pulse drawn from the bypass covers on the engine block...it works the diaphragm inside the pump back and forth and sends fuel to the carb. Entirely normal.
As BK says...your carb is flooding out the vent because the float needle isn't seating. Rap lightly on the side of the carb bowl...they can get cranky like that if they sit a while. If it doesn't clear up...pull the carb for a cleaning. Are you pull starting it or does it have an electric starter? It takes a good arm, shoulder, etc. to pull start one of those when it's cold. Starting one up again however is quite easy if the motor is warm. If you're pull starting it, it's easier to pull the recoil starter off and use a rope and the notch in the flywheel...more leverage that way. Post some pix if you have some...we love eye candy on this board.

 

[The_MilkMan]

Re: 35 Johnson fuel pump question

i have no idea what year it is. i looked at the fuel pump rebuilds and it would seem to be 1958-59 (my friends boat has the other type, so i knew right away it wasnt the other type). the model is RDS-20. you are correct, the pressure hose runs around the rear of the engine to the side, the fuel in and out go down (to tank and carb) the guy i bought it from said he hadnt been running it, but like i said it started on two pulls for him. granted he just started it then stopped as we didnt have water too it. he did say the carb may need rebuilt, so i am going to wait till i get the carb rebuild and the pump rebuild before i take it anywhere to get looked at by a pro. i dont think we pumped it full of fuel, we didnt pump that much and the hose was real loose, loose enough to come off when i pumped the primer (hence i thought it was odd fuel was coming out the pressure). however, before i get it all rebuilt and find out i started a fire in the engine, how would i check how much got into it? and how would i go about draining it?

 

[lindy46]

Re: 35 Johnson fuel pump question

It is a 1958

 

[1946Zephyr]

Re: 35 Johnson fuel pump question

58's are twin line set ups, unless this one has been converted..

 

[samo_ott]

Re: 35 Johnson fuel pump question

Actually, the super sea horse in '58 came with a fuel pump... And I think it was an option on the regular 35...

 

[1946Zephyr]

Re: 35 Johnson fuel pump question

Oh, seems like I saw some in the past that were the old pressure tank system, but yea, I have to agree: Sounds like a ruptured diaphram, if gas is in the actuator line.

 

[The_MilkMan]

Re: 35 Johnson fuel pump question

ok here are pictures i took of motor and boat.

 

[samo_ott]

Re: 35 Johnson fuel pump question

The compression relief system has been taken off.

 

[1946Zephyr]

Re: 35 Johnson fuel pump question

Ouch, have fun hand crankin that puppy That motor looks to be in decent shape. It'll be a good fishin motor for that boat and you'll be able to trol right down with it. Won't be much to bring up on a plane though. That boat looks like it's rated for about a 70hp motor.

 

[KB1]

Re: 35 Johnson fuel pump question

Ditto that!!

You'll be trollin' or lookin' for flyin' fish @ WOT!!!

 

[F_R]

Re: 35 Johnson fuel pump question

Ditto that!!

You'll be trollin' or lookin' for flyin' fish @ WOT!!!

Yep, that's the motor I thought you had. No doubt about it, the fuel pump diaphragm is ruptured, thus letting gas go out the pulse fitting.

As for the compression relief, it isn't even used when using the electric start. And when pull starting, it will actually start better without it----IF you are strong enough to pull the rope.

As for starting a fire, that is a real danger, so be very careful. First let any slopped gas evaporate before messing with it. Have a fire extinguisher handy just in case. And be mindful that a fireball will remove all your hide and hair and maybe your life.

 

[coolguy147]

Re: 35 Johnson fuel pump question

i can pull start it. takes about 5-7 pulls though. i am only 15 and yes it is very hard for me to pull start.

 

[The_MilkMan]

Re: 35 Johnson fuel pump question

awesome. thanks everyone so much for your help, i really appreciate it. i just have one more question: what does that lever on the top that is suppose to fit into the slot do? it was taken out and just sitting beside the slot, and when i put it back all it seemed to do was make a bad noise when i tried to hand crank it. it also seems to be sheering off little fins on the hand crank wheel. it ran when it was out so i figured i would just leave it out. just wondered what it was.

 

[tmcalavy]

Re: 35 Johnson fuel pump question

Use the electric start for cold starts, especially. You'll pull your arm out or tear up your shoulder trying to pull start that thing when its dead cold. After it runs and warms up it pulls over much easier. I think the lever you are talking about is the start-in-gear lockout.

 

[F_R]

Re: 35 Johnson fuel pump question

awesome. thanks everyone so much for your help, i really appreciate it. i just have one more question: what does that lever on the top that is suppose to fit into the slot do? it was taken out and just sitting beside the slot, and when i put it back all it seemed to do was make a bad noise when i tried to hand crank it. it also seems to be sheering off little fins on the hand crank wheel. it ran when it was out so i figured i would just leave it out. just wondered what it was.

Aha!!! So now we know what happened to the compression relief--you took it off. At least part of it, you did. Are you the guy that removed the rocker arms off the cylinder head too?

 

[The_MilkMan]

Re: 35 Johnson fuel pump question

i didnt take anything off of it, other than the cover. what rocker arms is it missing??

 

[samo_ott]

Re: 35 Johnson fuel pump question

The compression relief arm is missing. If you look at your photo and then FR's you will see an arm that goes from the top of the pull start off the back and down to the cylinder head. This arm actuates when the pull start is pulled and it open up 2 little valves that effectively expand the volume of the combustion chambers so that the compression is lower and it's easier to start.