Engine stalling

[Graham]

Could also be a partially blocked exhaust that allows an idle but bogs down and stalls with higher rpms. Test is pretty smelly and wet, but pull the exhaust hose off at the water lift or stand pipe and see if it will more easily achieve higher revolutions per minute.

Thanks for the suggestion. I think the exhaust is ok, I have really good flow out the tailpipe.

[Mo]

I replaced the electric fuel pump and the fuel filter. Then I and pulled the carb and gave it a good cleaning. I'm waiting for the heat to break before I go down and reinstall the carb.

I also installed a fuel pressure gauge!

I'll update with more details after it's all back together. I'm optimistic

Yeah, I know you guys had about 40 C. We had 39...Kids didn't want to go out today so we stayed home in the AC...watched movies. Tomorrow night we will all go out for the fireworks. If it runs badly at first then gets better, then worse again you know you have overwhelmed the filtering system. Generally if there's enough water to keep the engine stalling the tank needs to be drained. By the way, I switched gas supply...SHELL V power...not even a sputter. One of the station managers told me that Shell insists on regular filter changed on their tanks regardless of dip tests for water...I find it awesome and my cars run better on it as well. My Subaru gets 75 km more per tank on it.

[Graham]

Got it all back together. Carb is cleaned and I'm optimistic I've solved my problem. I noticed the fuel pressure gauge went from 1.5 to 3.5 after I installed the clean carb. That make any sense?

Anyway... I think I'm all set to go for Canada day tomorrow. Thanks for all the help! If I could buy you all a beer, I would

-Graham

[Cat27rampage]

Graham
I'm having very similar issues with my engine. We were out 2 weeks ago in great sailing conditions but the waves obviously stirred something up and the engine wouldn't start. Long story short im still stranded at the club but the beer is cold. Not having much mechanical experience I'm choked up about where to start. Clean carb....install fuel pressure gauge.....flush gas tank..... the engine purrs like a happy kitty in my slip though.
If anyone has a suggestion please let me know. Even the name of a reliable mechanic in the gta would be good....one that shows up!
Alister

[roadnsky]

...It seems to sputter and die and is very hard to restart. It seems to happen when it is both hot or cold. I find it happens under load as it will happily idle for hours.

New spark plugs gaped at 40

Something that stood out to me... you changed the plugs?
Are you SURE that you replaced the plug wires in the correct firing order?

Idle ok but stalling under power would be a classic symptom.

[Graham]

Graham
I'm having very similar issues with my engine. We were out 2 weeks ago in great sailing conditions but the waves obviously stirred something up and the engine wouldn't start. Long story short im still stranded at the club but the beer is cold. Not having much mechanical experience I'm choked up about where to start. Clean carb....install fuel pressure gauge.....flush gas tank..... the engine purrs like a happy kitty in my slip though.
If anyone has a suggestion please let me know. Even the name of a reliable mechanic in the gta would be good....one that shows up!
Alister

Mark at WestPort Marine Supply is a great guy and has lots of Atomic 4 experience. He's busy but give him a call. https://westportmarinesupply.business.site/

Where is your boat?

[Graham]

Something that stood out to me... you changed the plugs?
Are you SURE that you replaced the plug wires in the correct firing order?

Idle ok but stalling under power would be a classic symptom.

Thanks for this - yes I'm sure

[Graham]

Had the boat our for a fun Canada Day. She's running great now