Brand New Suzuki 140 Dies after 15 mins

[Motive140]

Hey Guys,

I have a new DF140 that will start up and run perfect for about the first 15 minutes. The motor doesn’t even have an hour on it yet. It seems like once the motor gets to operating temp it’s being starved for fuel, it sputters and dies. I can pump the bulb and get it running again but it only lasts for a few minutes and I have to repeat the process.

I’ve opened the fuel fill to see if it’s a pressure issue, I’m wondering if this sounds like an anti-siphon issue valve issue? The boat is going back to the dealer tomorrow, I just wanted to hear some opinions from other people as well.

Happy Fathers Day to all the Dads and Thanks in advance for any advice!

[Dave Neptune]

Motive, sounds like the dealer will be addressing a fuel problem. If the motor is new and your fuel connections are not you may have a weak o-ring seal in a fuel connector allowing air in. The new F/I engines do have a warm up cycle which is a bit richer until temps start to come up. This should only take a few minutes though. If not that it is probably a plugged filter or a new compromised fuel pump. The F/I motors a real fussy on fuel pressure.

Dave Neptune

[Motive140]

Thanks Dave greatly appreciated.

[Motive140]

After doing a little more digging, I checked the oil and it has a strong gas smell and is above full level.

[ndutton]

Sounds like a fuel pump diaphragm breach.

[Dave Neptune]

The 140 is fuel injected is isn't it? If the oil is getting fuel it there is an over-rich condition. A fuel injection function would require more pressure than a diaphragm pump would generate.

Dave Neptune

[Motive140]

From what I’ve been told if there’s an issue with the low pressure fuel pump, gas can get into the oil system. Between that and the cutting off problem I’m thinking that could be the issue. I definitely appreciate the advice, with a boat there can never be enough options to look at.

[ndutton]

I cannot say with certainty the Suzuki has this but our inboard engines are required by the USCG to deliver errant fuel from a mechanical pump diaphragm rupture into the crankcase for safety reasons. In other words, it's by design.