Bad engine performance. Often dies on startup.. slow to reack 4k RPMs

[fishinggg]

I have been having two issues with my engine.

1) It dies on startup, even after priming, but if I then wait a few seconds and restart, it immediately fires up and stays on fine through idling etc.

2) After being in a fishing spot and wanting to run to another.. starting it up, then trying to get on plane, it will go fine to 3000-3500 RPMs but then basically just stay there for 30 seconds to 1 minute and then all of a sudden run up to whatever RPMs I want (I stay under 5k as that is WOT and usually run at 4500).

I have a ~2008 Suzuku 115 4 stroke on a 19 foot Blue Wave VLC bay boat.

About a month ago I had to bring the boat in to get old gas removed. They also cleaned out the engine of the bad fuel/water filled fuel.

Does this sound like any obvious issue? It is unnerving to have to always prime the bulb before each start, which is not something I had to do in the past, and then also kind of stutter along at 3k RPMs until the engine really starts moving like normal.

 

[rejesterd]

Yeah, you shouldn't have to prime the bulb every time you go to start it. I would start by replacing the bulb itself and the hoses that connect to it. Also check for fuel leaking out of the fuel joint.

If the issue remains after replacing the bulb & hoses, then I would send the injectors in to be cleaned. Many places do that service, so you should be able to find one in your area.

If that makes no difference, then start looking at the fuel pump. If it's not expensive, replace it or try finding a repair kit for it.

It does sound like an obvious issue with fuel delivery, but since you had old fuel sitting in there with some water mixed in, it's hard to say where exactly the problem is. Could still be an issue in the vapor separator or the pressure regulator.. basically anywhere fuel flows through.

 

[Yahman]

It does sound like a fuel delivery issue. Some more ideas: If your gas tank is in the hull, double check that the fuel supply hose is secure to the fuel tank nipple. Remember, this connection will be under vacuum during running and if not secure can suck in air and cause rough running.

Try blowing air backward through the supply line into the tank to clear any obstruction. If that fixes it the problem will likely resurface when the crud returns but at least you will know what to fix.

Also, the one-way valve on the primer bulb works best when the bulb is oriented vertically, so add or shorten fuel line as needed.