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Suzuki DF140 Bogging Down at 2500 RPMs
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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
PostPosted: Fri Aug 16, 2019 3:42 pm    Post subject: Reply with quote

Guys - I replaced the fuel filters (low and high) and the fuel water separator. No change.

I dont hear any leaks.

I really dont think its bad gas. The fuel water separator was fine and the other engine is running perfect. I filled the tanks up at the same time/same pump.

I can see the check valve on the pick up and it looks fine. I dont know how to inspect further.

Any suggestions?

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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
PostPosted: Fri Aug 16, 2019 6:02 pm    Post subject: Reply with quote

I wooed inspect ASV

ASV is unscrewed from the fuel pickup elbow fitting and hose removed from other end

ASV can fail

Takes a few minutes to remove

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Brent Barrett
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
Photos: BrentB
PostPosted: Fri Aug 16, 2019 6:05 pm    Post subject: Reply with quote

http://www.moellermarine.com/moeller-marine/fuel-accessories/aluminum-anti-siphon-valve-14-npt-x-14-barb-033805-10/


It is safety item. Most remove the spring and ball inside the ASV, others replace with new ASV
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thataway



Joined: 02 Nov 2003
Posts: 20778
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Fri Aug 16, 2019 6:54 pm    Post subject: Reply with quote

I did have the Anti siphon valve go bad on my Tom Cat within the first 20 hours. But that should have a collapsed primer valve.
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Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
Photos: BrentB
PostPosted: Fri Aug 16, 2019 8:54 pm    Post subject: Reply with quote

Yep, I agree but spring and ball can corrode or clog with debris , slowing down fuel

Another approach is connect the portable gas tank to motor bypassing the tank to determine which side the issue is.

If have external fuel filter head,, easy to replace fuel filter and O ring and check the filter head is not clogged or blocked

Sharp bends in fuel hose can slow or stop gas

Several possibilities

Post the answer!
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
Photos: BrentB
PostPosted: Fri Aug 16, 2019 9:25 pm    Post subject: Reply with quote

I dont have a shop manual but did the high pressure filter have a gasket or O ring and was it replaced?

Fuel rail going to injectors can checked with fuel pressure guage
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
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PostPosted: Fri Aug 16, 2019 10:54 pm    Post subject: Reply with quote

Another possibility

is the high pressure pump inside the VST has a filter or strainer and it may be blocking fuel similar to Yamaha motors

these are suggestions
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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
PostPosted: Fri Aug 16, 2019 11:35 pm    Post subject: Reply with quote

You guys are amazing!

I've looked at the ASV but don't think I can get it out. I have the steering counsel on the deck and have far less room on the port side...plus, I'm a full sized man.

My current theory is clogged VST or a pin hole in a fuel line sucking in air.

I have decided to bring it into a pro for further inspection and repair.

I use the boat at a minimum twice a month, so I haven't used fuel additives. After talking to some more seasoned folks, I think that has been an error. Our gas in CA probably needs a little additive.

I have a date with a mechanic a week from today. I'll be counting down the days.

I will repost next steps. Thanks for all the input!
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thataway



Joined: 02 Nov 2003
Posts: 20778
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Sat Aug 17, 2019 2:56 pm    Post subject: Reply with quote

Yes, it is all but impossible to buy non ethanol fuel in CA--Maybe Aviation gas...about it.

I don't remember which side my bad ASV was, but my Moto was if you can see it, (even with a mirror) you can get it out...some how. My wife. has much thinner arms and hands than I do--and sometimes she can get into a narrow place and get a fitting loose. I just got rid of the anti siphon Valve.
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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
Photos: BrentB
PostPosted: Sun Aug 18, 2019 9:29 pm    Post subject: Reply with quote

Same here

If I can reach it then most likely can work on it or Admiral Patty is super handy, too. I am a lot more mobile after both hips replaced.

We had a similar issue on our Parker with Yamaha F225.

Checked everything including replacing high pressure pump filter in VST, new pickup tubes, removed ASV, removed and inspected fuel filter head, all filters, convert to Racor 2 micron filter and having the fuel injectors serviced at Flagship. Learned a lot. We didn’t identify any problem except the fuel hose in rigging tube going into motor has a sharp bend was kinking the inner hose and restricting fuel
. I bought a Yamaha fuel hose or pipe kit and the 90 degree bend area is a formed piece, and no issue to date. It costed 55 dollars including a new Yamaha dual valve primer bulb.


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Wefings
Dealer


Joined: 29 Nov 2005
Posts: 2086
City/Region: Panhandle
State or Province: FL
Photos: Cruise Ship #4
PostPosted: Mon Aug 19, 2019 10:22 am    Post subject: Reply with quote

Wefings
Dealer


Joined: 29 Nov 2005
Posts: 2079
City/Region: Panhandle
State or Province: FL
Photos: Cruise Ship #4
PostPosted: Sat Aug 10, 2019 10:22 pm Post subject: Reply with quote
Replace [or remove] the check valve on the fuel pickup fitting at the tank . They are a common problem .
Marc

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AK Angler



Joined: 18 Nov 2003
Posts: 327
City/Region: South Central
State or Province: AK
C-Dory Year: 2007
C-Dory Model: 26 Venture
Vessel Name: Rod Holder
Photos: Rod Holder
PostPosted: Wed Aug 21, 2019 6:51 pm    Post subject: Reply with quote

One of the best diagnostic tools for possible fuel related problems is a portable fuel tank with independent fuel line.

Unclip the fuel line at the motor and hook up the portable tank, full of new fuel (don't forget to open the vent on the portable tank). If the problem persists, it's something on the motor side of the fuel connector (could be fuel system, electrical, mechanical, etc.). If the problem goes away, it's something on the fuel tank side of the connector (bad gas, pickup system, leaking/collapsed/pinched fuel line, etc.).

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-Rod



89CD16A- The Navicula has been sold...
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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
PostPosted: Wed Sep 25, 2019 10:59 pm    Post subject: Reply with quote

Hey guys

Thought I’d provide an update on my issue. I great appreciated the input.

It turns out that when my welder patched the hole caused by the corrosion issue, too much heat was applied to the block and warping occurred. Both exhaust and water were leaking due to this damage. I don’t understand why it took a year to show up in engine performance, but I do know my welder had little experience with this type of patch.

So, True North is getting a birthday present! The re-power is scheduled to be completed on the 5 year anniversary of when I acquired her. I went with the same engines (Suzuki DF140) after a lot of research and a few calls.

Can’t wait to get back on the water.
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hardee



Joined: 30 Oct 2006
Posts: 12632
City/Region: Sequim
State or Province: WA
C-Dory Year: 2005
C-Dory Model: 22 Cruiser
Vessel Name: Sleepy-C
Photos: SleepyC
PostPosted: Thu Sep 26, 2019 2:40 am    Post subject: Reply with quote

WOW, that was unexpected. Tough to find, good catch.

I would highly recommend using Stabil if: 1. You buy gas in California, 2. You cannot get absolutely for sure, non-ethanol gas, 3. You are not sure when you are going to run the boat next. and 4. You are going to let it sit for more than a month until you will be running the boat next.

Ethanol gas is your #1 boat motor system enemy. That is everything from the filler "O" ring, the filler hoses, the tank, and the hoses from the tank to engine, and then there is the seals, gaskets, O rings and tubing inside the engine OB cowl.

I'm not a mechanic so this is what I get from my mechanics. I have not had a problem with my outboards, not since I started using my boat.

Harvey
SleepyC Moon


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BrentB



Joined: 15 Jul 2006
Posts: 4419
City/Region: Greenwood
State or Province: IN
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PostPosted: Thu Sep 26, 2019 3:56 pm    Post subject: Reply with quote

Shocked

I like the repower option
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