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Single gas line conversion question - 1960 Johnson 10hp Seahorse

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Old 05-15-2018, 09:15 PM
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Default Single gas line conversion question - 1960 Johnson 10hp Seahorse

I watched a video to learn about this motor, and it mentioned that if a single gas line conversion is done, to block the "hole/opening" where the old line was sucking from.

In my case, 1960 Johnson 10hp with single line conversion, I noticed the hole was wide open, not blocked at all.

Should it it be blocked? What happens if ran not blocked? Because it has...

This may be a separate issue: I ran this motor today, and for about ten minutes it ran fine, but a couple times it needed to have more fuel pumped by hand or it would sputter and die. I think the fuel line adapter that connects to the gas tank was leaking, causing me having to pump air back in...




Last edited by skipworkgofish; 05-16-2018 at 05:36 AM.
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Old 05-15-2018, 09:57 PM
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It's been a long time since I worked on that vintage engine, but I don't think that boss has anything to do with the tank pressure line.
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Old 05-16-2018, 05:31 AM
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Originally Posted by smccormick View Post
It's been a long time since I worked on that vintage engine, but I don't think that boss has anything to do with the tank pressure line.
At :35 in this video, right in the beginning, this person shows that it is where one of the old double gas lines went.

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Old 05-16-2018, 05:50 PM
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Bump for help!
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Old 05-16-2018, 06:07 PM
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First of all, I am pretty sure 1960 motors were single fuel line
what you point to is part of the intake manifold casting. If it was a double fuel line model, that is where the pressure line to the tank would be. I had a 1956 double fuel line

i had a 59 Evinrude, same motor, was a single fuel line

a pic of the other side of the motor will show the fuel pump mounted to the block. Clean the filter screen
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Old 05-16-2018, 06:20 PM
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I checked
​​​​​​​1960 were single fuel line motors
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Old 05-16-2018, 07:42 PM
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Originally Posted by 54bullwinkle View Post
First of all, I am pretty sure 1960 motors were single fuel line
what you point to is part of the intake manifold casting. If it was a double fuel line model, that is where the pressure line to the tank would be. I had a 1956 double fuel line

i had a 59 Evinrude, same motor, was a single fuel line

a pic of the other side of the motor will show the fuel pump mounted to the block. Clean the filter screen
Thanks. I'm going to assume this motor is older than 1960 then, because it had the conversion done.

With that being said, assuming it was converted to single line, does that intake where the old line was need to be blocked?

Here is a photo of the other side:





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Old 05-17-2018, 05:31 AM
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No. There is no port there. They must have changed the intake manifold.
Put your finger over it when it runs and you will not feel any air move.

if it is sputtering. Change the filter screen, pull and clean the plugs, clean fresh fuel w/o water and you should be ok
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Old 05-17-2018, 05:33 AM
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Looks like a 1960 to me
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Old 05-17-2018, 06:57 AM
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Originally Posted by 54bullwinkle View Post
No. There is no port there. They must have changed the intake manifold.
Put your finger over it when it runs and you will not feel any air move.

if it is sputtering. Change the filter screen, pull and clean the plugs, clean fresh fuel w/o water and you should be ok
I'll give it a look this weekend, thanks for the advice!
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Old 05-17-2018, 09:09 AM
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Originally Posted by 54bullwinkle View Post
No. There is no port there. They must have changed the intake manifold.
Put your finger over it when it runs and you will not feel any air move.

if it is sputtering. Change the filter screen, pull and clean the plugs, clean fresh fuel w/o water and you should be ok
One question, when you say there's no port there, what about that opening where the arrow is? It seems like an airway, and in the video I posted at 0:35 the hole is blocked.


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Old 05-17-2018, 12:42 PM
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Yep...... I looked up the video you refer to.
i don't see a port on your pic. They prob changed the manifold. Easiest to just put your finger on it when it runs. Double fuel line model would puff air. If you do feel air, you need to seal it. JB Weld is what I would rec

Yours must be a 59 if it was converted. They had sealed cowl and double fuel line.
you cannot use the old style tank, it has no vent
double fuel line motors ran a 16:1 mix. 4 gal fuel 1 quart oil
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