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Urafemac
Joined: 05 Jun 2019 Posts: 1 City/Region: USA, North Bergen
State or Province: AR
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Posted: Wed Jun 05, 2019 3:37 am Post subject: Fuel line not holding suction...70 hp |
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1984 70 hp Johnson, Original owner.
I have had all sorts of issues with this motor holding vacuum on the fuel lines. I find myself replacing the fuel adapters every year because the o-rings crack every season. Now, on to the problem...it holds suction while running but once the engine stops it loses pressure and I have to pump it back up to get gas in the line. I have installed new clamps, new fuel lines and a new primer bulb. I Tightened the fuel clamps on all the connections till my fingers bleed. Also, I made sure the carb assembly connections were tight.
Is there something I am missing here? |
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rogerbum
Joined: 21 Nov 2004 Posts: 5922 City/Region: Kenmore
State or Province: WA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Vessel Name: Meant to be
Photos: SeaDNA
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Posted: Wed Jun 05, 2019 9:44 am Post subject: Re: Fuel line not holding suction...70 hp |
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Urafemac wrote: | 1984 70 hp Johnson, Original owner.
I have had all sorts of issues with this motor holding vacuum on the fuel lines. I find myself replacing the fuel adapters every year because the o-rings crack every season. Now, on to the problem...it holds suction while running but once the engine stops it loses pressure and I have to pump it back up to get gas in the line. I have installed new clamps, new fuel lines and a new primer bulb. I Tightened the fuel clamps on all the connections till my fingers bleed. Also, I made sure the carb assembly connections were tight.
Is there something I am missing here? |
How old is the fuel line itself? I assume it's been replaced a few times. BTW - same outboard since 1984 - I know plenty of marriages that haven't lasted that long! _________________ Roger on Meant to be |
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Robert H. Wilkinson
Joined: 26 Jan 2011 Posts: 1234 City/Region: Port Ryerse
State or Province: ON
Vessel Name: Romakeme IV
Photos: Romakeme IV
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Posted: Wed Jun 05, 2019 6:40 pm Post subject: |
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Sometimes fuel lines are cut lengthwise to remove them from a barbed fitting. This can result in damage to the brass or plastic barb. I have seen leaks from this cut "line" despite being double clamped.
Another thing to check - there is a marine fuel line which has a liner to prevent any permeation. It requires a different size/type of barb and if put on a regular barb will leak. _________________ Talk to me and I will listen-- but if its not about boats or fishing all I will hear is bla,bla,bla,yada,yada,zzzzzzzz |
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WeekiTiki
Joined: 12 Jun 2019 Posts: 412 City/Region: Weeki Wachee
State or Province: FL
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: Just Cruisin'
Photos: WeekiTiki
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Posted: Thu Jun 13, 2019 3:43 pm Post subject: |
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'84 was the first year for VRO
You mix your gas though, right?
My 140 that year I converted over.
And of course you have the bulb pointed in the correct direction, i'm sure |
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