08 Turns Over No Start

Thanks for any help. My 2008 Air Nautique will turn over but not crank. It was running fine but died like it ran out of fuel. I still had fuel. Changed the filters and it wouldn't crank. Disconnected the fuel return line and no fuel when trying to crank. Installed new HP pump and now lots of fuel and good pressure, checked it at the Schrader valve and it sprays fuel 7 feet. When it turns over it wont even hit a little bit. Is there something that needs to be reset or anything? Please Help

Hollywood wrote: Turning over = cranking

The term "cranking" to turn over an engine coined from the old days!

Yes sir I check it and it's working fine.

No I haven't checked the spark plugs, Im not really sure how too (showing my intelligence)

Hollywood wrote: Turning over = cranking Your safety lanyard/kill switch functioning properly?

Mine pre-dates this kind of thing but out of curiosity with lanyard removed will the boats turn over with the starter if so equipped?

helpingjoe wrote: No I haven't checked the spark plugs, Im not really sure how too (showing my intelligence)

Meh I'm as dumb as a sack of potatoes but get a lot done -- just experience!

Personally I'd try starting fluid to see if I got fire first and go from there.

I did spray some starting fluid through the fame resistor and all I got was a big back fire type of sound

Kill switch - engine will turn over, start, and die after a few seconds. I'd definitely verify the kill switch is working with a meter to eliminate that possibility.

Compression - I've never experienced the washing and loss of compression you are describing. Not saying it can't happen, just think it's VERY unlikely to be the problem.

Easy way to check for spark is to remove a spark plug, re-attach the boot to it, and ground the outside metal part of the plug to the engine, you can just hold it against the block. Hold the plug with something that insulates you so you don't get belted with the spark, like a thick rag or rubber glove. Have someone else crank the engine and see if you see a thick, strong spark across the electrode. While doing this, be careful none of your clothes or body parts are near the belts and keep your face away from the spark plug hole as air/fuel will be forced out while you are cranking.

I'm not as familiar with that engine, I assume it's a PCM 343? Might be a breaker at the back of the engine, but if you are cranking and had fuel pressure doubt it's that. Check for spark and someone else will chime in with more engine specific knowledge.

That backfire is why I don't like starting fluid. Easy to do damage, no reason to ever need it.

The backfire makes me think you do have spark, but still check to be sure.

The fact that all you have done is change the HP pump and you have fuel pressure at the rail makes me wonder why the injection system isn't putting fuel to the cylinders, which is what I suspect is the problem. I don't know if there is a need to bleed air from the system or not. I'm really hoping someone with more knowledge of this engine will check in. Again, what engine is in your boat?

The engine cover hase "EX343" on it. Don't know if that tells you what engine it is or not.

Oops, didn't see your post, now we know you have a 343.

it doesn't have a distributor cap

I think the Excalibur has a distributor

Another thought, check throttle potentiometer at the end of throttle cable. If the potentiometer falls completely closed in case of broken throttle cable or more common a cracked plastic potentiometer housing it'll keep motor from starting.