Hard Start when Engine Warm

Took the boat out yesterday. Started fine when on the trailer. Idled out of harbor, then when I gave it gas to plane off..... it just bogged down. Would not take the gas. hmmm... never did that before. It was like there was a plug wire off. So I turned it off and checked all the plugwires at the plug and on the distributor. All was good there. Didnt see anything wrong, I tried to start it back up and I had to disengage the trans and give it full throttle while it spinning over. I had to let it crank over for 10 to 15 seconds before it finally started.

I could tell that it was pretty flooded cause there was a bunch of dark smoke coming out of the exhaust.

My boat usually starts right up with just a bump on the ignition key whether its hot or cold.

I know there are several things that I need to check out, but I am trying to ID my Holley carb. I have looked, but I dont see any numbers on it. I want to make sure my chock is working correctly.

Can someone help me ID my Holley Carb. My boat is a 1987. Engine is PCM 351W.

Follow the red line on the attached picture and it will take you to the list # of the carb. It's on the front of the air horn where the choke plate is.

In the picture the list # is 50419-1. Yours is probably different but it will tell you everything you need to know if you find the list number in Holley literature.

Basically you have a 4 barrel 4160 marine carb, but the list number is handy for ordering the right parts and knowing what jets,and other parts it came with originally.

By the way, I hope you took that picture with a cold engine because that choke sure is shut like it would be on a cold engine.

If that was a warmed up engine, it should be open or you would have some big time flooding issues

KenO

Sounds to me like the needle/seat/float got compromised caused a flood condition.

A disassembly/clean/rebuild seems in order.

Change fuel filter prior to removing carb and flush with a start and short run, , so questionable gas does not foul a fresh clean/rebuild.

Went back to the same ramp today. Boat was a little hard to start while on the trailer... but it started up. I idled out like I did the day before and it didn't bog down.... ran like I champ!
Ran a couple miles or so down the lake, turned it off. Tried to start it up again about 5 min later and it just didnt want to start. I had to spin it over and pumped the gas several times. It finally started. It didnt smoke like it was flooded.

I didnt turn it off again until I loaded it on the trailer. I tried it there and it did not want to start again. I spun it quite a bit, but it just did not want to start.   I raised the cover and pulled off the breather. The choke was full open. I even tried pushing the choke closed while I was spinning it and it still didn't want to start. Closed the cover and pulled it out of the water.

I don't "think" it was flooded just because I couldn't smell gasoline, but it may have been.

I cleaned the points with 1000 grit paper before I took it out today. They looked like they are in good shape. distributor and rotor button looks ok.

Any ideas?

Pumping the throttle on a hot engine will just make it more difficult to start. Especially after a hot shut down, often get some expansion/dripping from heat soak.

Many boats need the throttle cracked open on a hot start

There may be something amiss, but there is a chance your first response could be exacerbating the difficulty.