I would like to get some opinions from you on what think is the problem

Last week I took the boat out and it ran perfect. Put it in the garage with no changes. Today I went to start it and it wouldn't fire.

Started trying to figure it out. Noticed the distributor was a little loose but figured not enough to cause it not to run. I checked for spark and I have spark. Pulled the distributor cap, looked good. Pulled the distributor to see if gear was good , it was fine. Checked the lanyard switch and neutral safety switch and they seem good too.

Figure I have a fuel problem. The boat will fire for one to two seconds and die.
Sprayed a little starter fluid in the throttle body it fired, then died. ( Just a little as I know this can damage sensors_)

Pulled fuel water separator and it is full and who knows if its good.

Fuel pump runs when I turn on the ignition, but not sure if it's working internally.

With throttle wide open and cranking I see no fuel spraying in the throttle body.

I am guessing the fuel pump is to blame at this point, but would like to get some other opinions.

Engine is a 523 cu in, with Holley fuel injection, ( Was originally a 1999 502 MPI) Mefi 3.

What would you look at first, second ect.

Thanks

fuel pressure

Ayuh,..... Dump it into a clear container, 'n look for anything but clean fresh gasoline,.....

Then screw on a new filter,.....

Troubleshooting guide

https://documents.holley.com/199r11369.pdf

Is the the fuel injectors pulsing when cranking - you can test up to the injectors to make sure you have a signal by using a noid lite at the injector connectors. If no signal check fuses and grounds and so forth. If all that check out possible ecm issues. Do you have a MEFI ecm or a Holley ecm ???

You do have a nice strong ignition spark on all 8 , I would make sure about that first and how are you checking for spark ????

Any updates ?? Thanks

John, still trying to figure things out. I will give an update soon.

it won't spray fuel,,your in the clear flood mode.just crank and see if theres fuel and check the pressure.

that depends on what ECM is used here -- Its a custom built engine.

Clear flood mode was only used on MEFI 1 thru 3 or possible 1 thru 4 MEFI.

Most aftermarket ecu's will go into flood mode(no fuel thru injectors) around 90 % tps.