How old is the fuel? I've seen this happen before, and a tank of high octane was what it needed.

I'l admit...I'm just spitballing here. I don't know crap about boats, only what I've seen other people go through.

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1987 560SL
85,000 miles

Where's Gus Wilson when you need him?

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution

I don't know why your post made me think of this JP, but I wonder if maybe there is water in the tank that is not exposed to the pickup when on the trailer, when at a different angle in the water, it's picking up water?

Maybe this worth checking rock.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution

Wow, what a thread. Can we get back to my chainsaw now?

Go with Stihl silver mix.

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'06 E320 CDI
'17 Corvette Stingray Vert

Where IRock get to?

Is it my imagination or is there a faint hint of a pattern of iwrock’s motor vehicles?

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Toyota is a leader only because their drivers block everyone behind them. Oh what a feeling.

Boat will crank, but will not turn over. Sometimes, it will want to start, but just won't get firing on all cylinders. I've got new plugs in, and checked the spark, and so I'm good there. I've got them gapped correctly to spec as well.

Sent from my Nexus 5 using Tapatalk

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.

She will crank, but not turn over. I've verified it has spark

Can't smell gas when its in the water.

When I start it on the trailer and drop it into the water, it will run fine all day, as long as I don't let her idle too long or turn her off.

Sent from my Nexus 5 using Tapatalk

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.

This one was given to me in exchange for some computer work for friend. I wouldn't have willingly spent money on this with these problems.

Sent from my Nexus 5 using Tapatalk

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.

http://www.justanswer.com/boat/2xvs7-boat-wont-start-water-starts-driveway-454-mercruiser.html

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have no worries.....President Obama swears "If you like your gun, you can keep it

I wonder if you fuel filter is clogged.

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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman

why would it start out of the water?

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have no worries.....President Obama swears "If you like your gun, you can keep it

You mean does crank/turn over but not fire up/sustain? Perhaps the issue is exhaust restriction. The water is exasperating the issue? Did something nest up there?

If you pump the throttle w/ air filter off, can you see spray shooting down the carb throat?

Air and Road mentioned the angle of the boat and the fuel in the tank in/out of water.....wonder if it has debris in the tank bottom.

Dual fuel tanks?
Try switching to the other tank if dual?
Maybe pump some gas into a container and check for water in fuel.



I had a boat and one of the side tanks vent had come loose and rotated the vent forward and was getting spray all the time.