I have done almost everything mentioned in this post, however, you or I had to get away from it, just to clear my head, same issue, cranks but won't start. It's a 2004 Crownline Volvo Penta 5.7 Ltr GX-E spent 7 days straight. Found many problems like oil filter clogged, brown foam, had to purge entire oil system, could have been that flapper in the exhaust manifold, also as it was "Winterized" by the experts, when I asked where the scope of work and what did you do they didn't tell me it was just a bag of parts left in a baggie full of water. So I checked everything all their connections the cable found a sensor that had a burn or overheated connector on the right rear lower section of the engine. Also found that somehow all the power steering fluid was gone and bone dry. So needless to say the vendor who sold us the boat for 53k hey given us a prior quote of $10,000 to pull it out of their storage where they had let the battery drain down left the covers off for almost a year like many in the state of Texas not many boters were able to get out on the water due to the floods last year 2015.
So, a lot of these engines sat for a long time, I even rebuild the EFI located on top of the motor and everything else on the boat including the control panel for shore power, water pumps, etc, inside the boat works great.
But now that I've gotten away from it for a few days thinking to myself it was a fuel system issue, because when I first put it in the water I got the scream of the fuel pump, within about two minutes of running and then it sat being worked on for the next seven days.
This similarities of the motor not running and also the generator 5KW not starting as well, take me away from the fuel delivery system and is now leaning towards the automatic shutdown or safety that's tied to the lanyard that dangles beneath the throttle .
So not only was I told that all the fuel injectors had to be removed, cleaned and recalibrated, I already changed the oil, the anti-siphon valve, change the fuel pump regulator, check fuel pressures with manifold gauges and completely rebuilt the entire low and high fuel pump system, check pressures with manifold gauges, etc.
Actually remove both filters or pumps excuse me put them up to a 12 V external supply and ran them in a deep tub of seafoam and it was pumping as fast as it could.
There's a post on here that was very helpful describing the paint issues are the clog in the filter screens etc. however since both motors won't start like I mentioned above, my next step is to Troubleshoot the automatic kill switch from where it starts underneath the throttle, then heads into the backside of the main control panel on your dashboard where all the FLS and switches are for your lights, etc. and troubleshoot the automatic kill switch, from where it starts underneath the throttle, heads into the backside of the main control panel on your dashboard, where I remember, on a few occasions, where the door was sliding into the wires behind the console, as if they got crushed as a result of either poor design or somehow the bundles behind their became loose.??
So, that's my next step, is to check behind the console find out where that kill switch goes including the automatic fire suppression system where there might be some loose wires or broken wires, because, on the motor generator there's a solenoid in line with the fuel system and this generator only has 95 hours on it, anyways there's no power going to the solenoid when attempting to start the engine generator.
With all that said, I'm beginning to believe it's tied to the life safety loop that goes from the lanyard to the safety related fire, which is behind the console, down to the generator, down to the engine, and it could be as simple as that.
