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Westie
Joined: 08 Jun 2014 Posts: 177 City/Region: Bodega Bay
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: True North
Photos: Westie
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Posted: Fri Aug 09, 2019 8:45 pm Post subject: Suzuki DF140 Bogging Down at 2500 RPMs |
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Hi there - hoping for some advice on an engine issue
I have twin 2007 Suzuki DF140s and today the starboard engine shut down at about 3000 rpm as I left the marina. It started fine and idled without issue before we left the slip.
Once it shut down, we pumped the ball and it was collapsed. It wouldn't start at neutral so I rev'ed it a little and started at high RPM. The RPMs were not holding firm so we returned to the slip.
At the slip, we found that it started fine and idled well but couldn't hold consistent RPMs above 2500. It was bogging but not shutting down.
The engine has about 700 hrs. I had replaced the low pressure fuel filter at 400 hr and changed the fuel/water separator recently. Also, the port engine ran perfect so I'm ruling out bad gas.
Everything ran great 10 days ago and the boat is used regularly.
Right now, I'm thinking high pressure fuel filter but that shouldn't need to be changed until 1000 hours.
Any thoughts? _________________ True North
2006 Tomcat 255 |
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BrentB
Joined: 15 Jul 2006 Posts: 4419 City/Region: Greenwood
State or Province: IN
Photos: BrentB
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Posted: Fri Aug 09, 2019 10:33 pm Post subject: |
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Primer bulb new or old and vertical?
All fuel hoses including ones in rigging hoses new or old?
tank vents clear?
Does it have high pressure pump filter?
VST clogged? _________________ Brent Barrett |
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Westie
Joined: 08 Jun 2014 Posts: 177 City/Region: Bodega Bay
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: True North
Photos: Westie
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Posted: Fri Aug 09, 2019 11:18 pm Post subject: |
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Thanks for the questions. Responses:
Primer bulb new or old and vertical?
- Old and vertical
All fuel hoses including ones in rigging hoses new or old?
- Old
tank vents clear?
- Yes
Does it have high pressure pump filter?
- Yes with 700 hr. PM says change at 1000
VST clogged?
- Not sure how to check. |
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TyBoo
Joined: 23 Oct 2003 Posts: 5313 City/Region: Warrenton
State or Province: OR
C-Dory Year: 1996
C-Dory Model: 25 Cruise Ship
Vessel Name: TyBoo
Photos: TyBoo
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Posted: Sat Aug 10, 2019 12:01 am Post subject: |
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Wouldn't the collapsed primer bulb indicate a problem on the tank side? It may be as simple as a clogged screen on the fuel pickup in the tank. It is free to check - unhook the hose from everything beyond the tank and blow through it. If it is plugged, that should dislodge enough to make it run until the screen can be removed and cleaned properly.
It could also be any filters on the tank side of the bulb. If the bulb is flat then the motor fuel system is trying real hard to draw fuel from the upstream side, so the pumps, filters and vapor tank are at least trying to function.
Good luck - I hope it is an easy fix. _________________ TyBoo Mike
Sold: 1996 25' Cruise Ship
Sold: 1987 22' Cruiser |
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Micahbigsur@msn.com
Joined: 27 May 2019 Posts: 484 City/Region: Big Sur
State or Province: CA
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: Sierra
Photos: Sierra
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Posted: Sat Aug 10, 2019 12:34 am Post subject: |
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On our shakedown cruise our big new Suzuki ran fine but the new 9.9 sucked the bulb flat and died. Something was installed wrong before the bulb or was defective. I am installing a larger filter/water separator and will replumb the small engine parts, hopefully that will sort it out and since the big motor runs fine and there is a new line from the tank to the filter I know that is not the problem.
If the bulb is sucked flat it seems that the Suzuki 140 problem is before the bulb. Do both run separate lines and filters all the way from the tank? If rhey share any part of the system and one motor runs good then it is good in the shared section. _________________ Micah Curtis and Dana, RN
2003 C-dory 25 Sierra, 200, 9.9 and 2.5 Suzukis
2012 R25 SC Sequoia (2015-2018)
1978 Folkes 38 SV Audacious (2006-2015)
Micah, KJ6GUF, Dana, KJ6GXG |
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Micahbigsur@msn.com
Joined: 27 May 2019 Posts: 484 City/Region: Big Sur
State or Province: CA
C-Dory Year: 2003
C-Dory Model: 25 Cruiser
Vessel Name: Sierra
Photos: Sierra
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Posted: Sat Aug 10, 2019 12:42 am Post subject: |
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I haven't delt with outboards in decades. I have been sorting out diesel fuel systems and know their problems well, am I missing something on outboard systems with primer bulbs?
Thanks. |
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Westie
Joined: 08 Jun 2014 Posts: 177 City/Region: Bodega Bay
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: True North
Photos: Westie
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Posted: Sat Aug 10, 2019 12:53 am Post subject: |
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Checked with my buddy and he said the bulb wasn't "collapsed" or "deflated". I don't think the issue is before the bulb.
Also, he pumped it while at high RPM, the engine was running rough and pumping the bulb didn't change anything.
Im thinking its a clog in the VST |
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bshillam
Joined: 21 Aug 2007 Posts: 782 City/Region: Bellingham
State or Province: WA
C-Dory Year: 1981
Vessel Name: Heaven To Me
Photos: My Heaven
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Posted: Sat Aug 10, 2019 10:36 am Post subject: |
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I would make sure to change the filters out. Not too expensive to change them out. Also make sure to change the fuel separator. If you have any water in the system it becomes less efficient at separating when near capacity. You may have taken in some water from a source such as a marina. Change all three, water/fuel separator/both filters. |
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Pacificcoast101
Joined: 29 Sep 2007 Posts: 717 City/Region: Torrance
State or Province: CA
C-Dory Year: 2008
C-Dory Model: 255 Tomcat
Vessel Name: No Pressure
Photos: No Pressure
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anchorout
Joined: 03 Jul 2013 Posts: 357 City/Region: Lake Charles
State or Province: LA
C-Dory Year: 1999
C-Dory Model: 22 Cruiser
Vessel Name: EZ DUZIT
Photos: EZ DUZIT
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Posted: Sat Aug 10, 2019 1:33 pm Post subject: fuel bulb |
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Had same problem. I pulled the input end of the fuel bulb loose and connected it to a remote 6 gal fuel tank from my dinghy. Pumped the bulb and all ran well. That isolated everything but the fuel feed from the tank. New filter and hose was in good shape. Screen on tank pickup tube was clogged with a piece of plastic. _________________ I DON'T KNOW WHAT I'M LOOKING FOR - That's what makes the search so exciting! |
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BrentB
Joined: 15 Jul 2006 Posts: 4419 City/Region: Greenwood
State or Province: IN
Photos: BrentB
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Posted: Sat Aug 10, 2019 3:46 pm Post subject: |
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Fuel hoses have an inner hose and can separate or kink at sharp bends like going from rigging tube to the under cowling fuel system
Checking the fuel rail pressure will help
I dont have a factory service manual to look at the fuel system
VST is vapor separator tank can accumulate debris and in Yamaha motors, there is high pressure pump inside the VST with a screen filter at the pump bottom. The pump pressurizes the fuel rail to the injectors
. Check rail pressure would be helpful |
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Westie
Joined: 08 Jun 2014 Posts: 177 City/Region: Bodega Bay
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: True North
Photos: Westie
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Posted: Sat Aug 10, 2019 8:08 pm Post subject: |
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Thanks all!
I ordered new filters and will pull out next weekend for maintenance.
Any input on replacing the H/P Filter?
I read someone say they used a special tool but I don't see what they are referring too.
Anyone do this work themselves, that could offer advice? |
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Wefings Dealer
Joined: 29 Nov 2005 Posts: 2086 City/Region: Panhandle
State or Province: FL
Photos: Cruise Ship #4
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Posted: Sat Aug 10, 2019 11:22 pm Post subject: |
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Replace [or remove] the check valve on the fuel pickup fitting at the tank . They are a common problem .
Marc _________________ Wefings Marine Website
Since 1909 |
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BrentB
Joined: 15 Jul 2006 Posts: 4419 City/Region: Greenwood
State or Province: IN
Photos: BrentB
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Posted: Sun Aug 11, 2019 7:47 pm Post subject: |
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Post the answer! |
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Westie
Joined: 08 Jun 2014 Posts: 177 City/Region: Bodega Bay
State or Province: CA
C-Dory Year: 2006
C-Dory Model: 255 Tomcat
Vessel Name: True North
Photos: Westie
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Posted: Mon Aug 12, 2019 10:24 pm Post subject: |
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BrentB - I will! I am so thankful for this resource!
Pulling the boat out Thursday. I plan to change all filters, spark plugs, inspect all hoses, and valves.
Ordered 3 day delivery from Browns Point. I hate having her unavailable! |
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