Indmar 5.7 vortec will not start

[Z3cta]

Hello guys....I am in need of help and suggestions

I have an 07 Indmar 350 MCX engine (chevy 5.7 vortec MPI) in my Mastercraft which ran fine and I was about to launch it and it quit running and not will not start. It cranks but no start. It tries to run for a few seconds and then it dies out. I try to give it gas in neutral but that does not do much and it tends to backfire a bit and then turns off. I made a few recordings while trying to start it and when it sputters and backfires for review. Any ideas will appreciate it. Thank you

https://drive.google.com/file/d/1L3D0ZyhUQ_BDH_p2gc3rRqsw942yCtiZ/view?usp=sharing

https://drive.google.com/file/d/1J3IEbfiJbnZoVUlY4uI4H-R3_VB4KCPS/view?usp=sharing

https://drive.google.com/file/d/1A7uPZDoss7ki2jaxwZHC7ydBWFXeIGOv/view?usp=sharing

 

[alldodge]

I'm not downloading a file to watch

Check fuel pressure and if there is spark

 

[Z3cta]

I'm not downloading a file to watch

Check fuel pressure and if there is spark

there is pressure, 50 PSI and spark. It does try to start as I said

 

[alldodge]

I have 6 Indmar manuals but don't know which one would be used for your motor. Have to cover MEFI 1 thru MEFI 6

The MEFI 6 list 55 to 62 psi

Having fuel and spark means it should run but something is not staying on. Need to scan for codes

 

[Z3cta]

I have 6 Indmar manuals but don't know which one would be used for your motor. Have to cover MEFI 1 thru MEFI 6

The MEFI 6 list 55 to 62 psi

Having fuel and spark means it should run but something is not staying on. Need to scan for codes

Bad fuel, bad pump, fixed that, it runs now, but I am getting a misfire on cyl 2 and not go over 3k rpm
...ugh...boats

 

[Antax]

with the bad fuel you could have a clogged injector now. Or possibly a fowled spark plug. I would start with changing the plugs and if it doesn't get any better pour a bottle of sea foam in the tank and run it.