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Suzuki DF300 Problems

Old 11-17-2014, 08:21 PM
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Default Suzuki DF300 Problems

I have a 2013 DF300 with 250 hours that has a recurring issue. I haven't been able to figure it out, and my mechanic's stumped as well.

A few trips ago, it shut down on me after idling for a few minutes then being up on plane for 15-20 seconds. I had run it earlier in the morning without issue and then stopped to fish for 45 minutes or so before making a move. No codes came up on my gauges when it happened. After a quick check of everything obvious (kill switch, fuel bulb, water separator, etc), it started up just fine. After 10-15 seconds, it began to sputter and eventually killed. I repeatedly went through everything I could, but it continued to do the same thing - start fine then kill after 10-20 seconds - before I made the 2 hour trip back to the launch on the trolling motor. One thing I did notice is that when it would begin to sputter, it would some times rev back up a little and then kill.

I brought it to my mechanic (Duvic's), and he was unable to replicate it at his shop. They ran it several times and never had any issue. I had them go through everything, change the LP filter, etc, and nothing looked out of line to them. I ran the boat, myself, after picking it up, and it ran perfectly. Aside from an oil filter with a pin hole in it (what a huge f%&^%ng disaster that was...), it ran perfectly for another 3 trips.

The weekend before last, it happened again. I had fished all day making 8-10 stops and never had an issue. I idled for 5-10 minutes leaving a spot then got up on plane for 15-20 seconds before it shut down on me. Again, no codes on the gauges, and it would always restart fine. It just won't stay running, either at idle or in gear, for more than 15 seconds. It also sounds like there's a "clunk" sound when I turn the key off after it shuts down on its own.

It's back at the mechanic now, but they say they've never seen this issue and haven't figured it out yet. I'm pretty certain that it's a fuel issue but can't seem to nail it down. Any help would be much appreciated, as this is now the 3rd time in 5 trips its left me stranded.
Old 11-17-2014, 08:48 PM
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When it does this, have you tried pumping up the primer bulb to see what, if any, help it may provide?

Thinking anti siphon or fuel line issue. Possible to try a separate tank of fuel? Just take a gas can and submerge the fuel line in it.
Old 11-17-2014, 08:55 PM
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Did you try pumping the fuel ball? Mine has done the same thing as yours for the past 2900 hours. Mostly does it after its been sitting after being run in the middle of the day especially if its a hot day. I'm sure its some sort of vapor lock issue. I think an electric fuel pump in the fuel line would solve the issue but I've never heard to using a car type fuel pump with an outboard.

By the way, my DF300 has 2008 build date but was installed new on a 2010 boat.
Old 11-17-2014, 08:58 PM
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I would take the anti siphon valve off first. I've never heard of this, but it sure sounds like fuel.

Also, see if you can replicate it on a separate, WELL RIGGED, external fuel tank. This will isolate the problem to either the boat or the engine itself.
Old 11-17-2014, 09:07 PM
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I did try pumping the bulb, but that didn't have any effect. It seemed to be hard after shutting down each time, so I didn't think that was the issue. I also thought about the anti siphon valve, but my mechanic says the 300 doesn't have one. ??? I haven't had time to run it on an external tank, but that's my next step.

Blackwater21,

You say yours has had the same issue for the last 2900 hours. How do you resolve it, or have you had to replace anything?
Old 11-17-2014, 09:19 PM
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Originally Posted by Boater Ben View Post
I did try pumping the bulb, but that didn't have any effect. It seemed to be hard after shutting down each time, so I didn't think that was the issue. I also thought about the anti siphon valve, but my mechanic says the 300 doesn't have one. ??? I haven't had time to run it on an external tank, but that's my next step.

Blackwater21,

You say yours has had the same issue for the last 2900 hours. How do you resolve it, or have you had to replace anything?
The antisiphon valve is on the tank, not the motor.
Old 11-17-2014, 09:30 PM
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Maybe a new mechanic? That valve is on the tank. Try Ryan at Terrebone marine or Will at Outcast. Both are excellent. Bring a little 6 or 12 gallon external tank next trip and when it happens hook the tank directly to the motor. You tank will need it's own Lines and bulb. Do NOT use any of the existing lines at all--connect straight to the motor barb. If it still does it then you know it's the motor itself.

One thing I'd also watch very carefully is the voltage. It's possible you're dropping voltage after prolonged idling causing things to go haywire. It may be as simple as a bad battery or improper rigging not charging the house or starting battery sufficiently at idle. Make sure you're over 13v at idle. Check both the gauge and the reading on your Garmin screen.
Old 11-17-2014, 10:14 PM
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Originally Posted by MakoMyDay View Post
Maybe a new mechanic? That valve is on the tank. Try Ryan at Terrebone marine or Will at Outcast. Both are excellent. Bring a little 6 or 12 gallon external tank next trip and when it happens hook the tank directly to the motor. You tank will need it's own Lines and bulb. Do NOT use any of the existing lines at all--connect straight to the motor barb. If it still does it then you know it's the motor itself.

One thing I'd also watch very carefully is the voltage. It's possible you're dropping voltage after prolonged idling causing things to go haywire. It may be as simple as a bad battery or improper rigging not charging the house or starting battery sufficiently at idle. Make sure you're over 13v at idle. Check both the gauge and the reading on your Garmin screen.
Good call on the battery voltage..

I think you have some direction to go. Good luck man...
Old 11-18-2014, 03:43 AM
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I had a similar problem with my 2008 300's.I would run in from 40 miles offshore..all fine.It would sit at the dock for 45 minutes.When I would try to start my port motor ..It wouldnt.I would throttle it up in netural,it would sputter and die.Seamed like a vapor lock or fuel related.We replaced the high preasure fuel filter,the regular engine fuel filter and inspected and drained the racor separators.Took it out seamed fine.Then when idleing thruogh a no wake zone it just died.I inspected the primer bulbs..they seamed a little bit cracked.Replaced borh of them.Have not had a issue since.I'm sure yours is new with a 2013 motor?Capt.Mike
Old 11-18-2014, 06:41 AM
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It sounds like a heat soak/vapor locking issue. After running and then sitting for awhile on hot days the fuel in the VST turns to all vapors and when you go to restart there is no fuel in the VST, the ball may be hard at first because there is still fuel in the lines prior to VST. You need to start the engine, let it idle for a couple minutes and then pump the primer ball, you basically need to purge the fuel system of the vapors and get good fuel back into it before trying to run hard.
Old 11-18-2014, 08:43 AM
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Guys,

Thanks for the info. The voltage looked good when I checked, so I'm leaning towards the vapor lock issue. In that case, is there any real fix, or is it just something I have to live with?
Old 11-18-2014, 09:21 AM
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I would call suzuki customer service and log the issue with them, they are working on some fixes but the more they here about it, the better the response.
Old 11-18-2014, 09:27 AM
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Not an engine mechanic, nor I am trying to diagnose this issue. What I do prior to shutting down after a run is, I let he engines idle about 5 minutes. I have had Suzuki's along time and this seems to avoid what you are referring to. It may be just coincidence but if it annoyed you enough to try this it may help you.
Old 11-18-2014, 09:28 AM
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I am leaning towards a fuel pump. The issue of them idling faster towards the end suggest they are leaned out and don't have enough fuel.
Old 11-18-2014, 09:30 AM
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Originally Posted by Flying_Norseman View Post
I am leaning towards a fuel pump. The issue of them idling faster towards the end suggest they are leaned out and don't have enough fuel.
because of the vapor lock in the vst, the fuel pump is dealing with vapors not fuel at that moment........
Old 11-18-2014, 09:34 AM
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Originally Posted by 1NO REGRETS View Post
because of the vapor lock in the vst, the fuel pump is dealing with vapors not fuel at that moment........
There are two fuel pumps on that motor, either one could cause the symptoms the OP described.
Old 11-18-2014, 09:39 AM
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Can a EFI motor that has a pressured fuel system get vapor lock?


I would check the vent on the fuel tank
Old 11-18-2014, 09:46 AM
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Originally Posted by Flying_Norseman View Post
There are two fuel pumps on that motor, either one could cause the symptoms the OP described.
yes and I have two fuel pumps as well in mine.......
Old 11-18-2014, 10:06 AM
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Originally Posted by 1NO REGRETS View Post
Not an engine mechanic, nor I am trying to diagnose this issue. What I do prior to shutting down after a run is, I let he engines idle about 5 minutes. I have had Suzuki's along time and this seems to avoid what you are referring to. It may be just coincidence but if it annoyed you enough to try this it may help you.
Thanks. This is very useful info. Much appreciated.
Old 11-18-2014, 10:08 AM
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Originally Posted by 1NO REGRETS View Post
because of the vapor lock in the vst, the fuel pump is dealing with vapors not fuel at that moment........
There is an insanely easy fix for this issue.

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