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Suzuki df 140/ outboard fuel help (PLEASE)

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Suzuki df 140/ outboard fuel help (PLEASE)

Old 12-09-2018, 12:06 PM
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Default Suzuki df 140/ outboard fuel help (PLEASE)

Have a bit of a mystery going on. Three trips ago, after running about 10 miles the engine bogged down. Limped almost all the way back to the dock and it totally quit. Changed the fuel water separator and took it back out. On this trip, same thing happened. This time when it bogged down, I shut it down. Started it back up, and it was as if nothing ever happened. Ran back to the channel about 10 miles back, and it did it again.

Replaced the the fuel line from the tank and primer ball, and tried again. Exact same thing happened. Got to almost 100 yards from where it bogged the previous trip 10 miles. Shut down, and started back up. Ran like a champ again.

Very weird. Can’t figure it out. Why is it able to run fine after a redstart. Did notice that the primer ball does go a little soft but not collapsed.

Another weird thing was when changing the fuel water seporator, fuel kept flowing. Didn’t stop while system was open. Not sure if the 2 are related.

Any help/suggestions would be greatly appreciated.

Old 12-09-2018, 12:10 PM
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How long did you wait before re-starting? Is it possibly a clogged vent? I had mud dobbers clog up mine once.

I've also had similar symptoms when running mine for a couple of hours at the same RPM. If I recall, it was something to do with the "throttle position sensor" (probably butchering the part name) if I remember correctly.
Old 12-09-2018, 12:22 PM
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Restarted immediately.
Old 12-09-2018, 12:39 PM
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Drain the vst tank, small screw at bottom....bet it has water in it....
Old 12-09-2018, 12:48 PM
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What year DF140? Check your oil and make sure it's not milky first. After that, check the fuel filter on the engine by the valve cover. Check the fuel lines around the fuel rail and fuel cooler (if equipped). Fuel pump is a piston type mounted on the valve cover and is actuated by one of the camshafts. It could have a leak internally. Check the pickup tube in the fuel tank for a crack or clog. Could also be a clog in the VST. Make sure there's not leaves or other debris in the air box clogging the screen on the throttle body.
Old 12-09-2018, 01:37 PM
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Thanks for the tips so far. It’s a starting point for me to look at. It’s a 2004 with about 450 hours.
Old 12-13-2018, 12:36 PM
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when this happens unscrew the gas cap if there is a suction sound you have a clogged vent
Old 12-13-2018, 01:13 PM
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the fuel continuing to flow when changing the fuel/h20 sep would have me looking at the vent, pickup, and anti siphon for sure

I would also drain vst into a glass jar and see what comes out

you can have stuff sitting in there but it will rest on the bottom and when you run at high rpm it will suck it up (water, varnish, trash etc)

I would also check fuel rail pressure to make sure it is in spec

good luck

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