Gross. Start with new filters, run off a remote tank to see if that fixes it. Can't see much of the water in your pics, but if it's there, that can/will for sure cause problems.
Yes do start with new filters and if possible run off a remote tank as Nola mike said. The fuel pressure valves should be on the back left side of the engine by the distributor cap I do believe. Maybe different on the boat engine. Should run up along the top of the intake manifold and into the top of it. They will be hard lines
Manual indicates range should be from 15 to 21 in Hg, your just at the 15 mark. It could be nothing because the gauge is smooth and stead, but you get the same thing with low compression. I would think better if it was at least 17 to 18
Hi there, I've changed filters and also connected a seperate tank. The boat didn't loose the power as before but it's still missing going from 2000 up to 3000 and once it's over 4000rpm the engine starts to backfire a lot. Since fuel problem is solved as I eliminated the tank... I am assuming that I need to clean injectors. What do you think Please
Cleaning the injectors sounds like a good idea with thins kind of stuff found in the filter. Get them professionally clean not just some injector cleaner, and flush the lines and fuel rail.
I have a boat and engine very similar to yours. A few things I have learned My filters look like that every season when they get changed. That black you see is the result of the insides of your cheap Sea Ray tank to filter fuel lines slowly dissolving. Sea Ray came up with better lines in about 2008. Has never caused any issues with my engines The Cool Fuel Module that houses both fuel pumps and the fuel pressure regulator is prone to failure with a system of your boats age.
The module had issues with paint flaking off the cover and plugging up the fuel pressure regulator. If allowed to continue long enough the paint can make its way to the injectors, since the FPR is down stream of the filters. The other issue with this CF3 is that there is a paper thin wall that separates the fuel cell where the pumps are located and the water jacket that surrounds it. Salt water will eventually corrode this water jacket and will make its way into the fuel chamber.
A healthy vortec headed engine shoudl make around 175 - 185 psi. cranking compression. I have seen cracked seats/heads that were in the 150 psi range
