Picking up injectors today. Shop said 4 flowing at 80ml 2 at 75ml. Now they are all at 90. We'll see if that actually makes a difference. Picking them up at 4:30.

Maybe a dumb question here, but that boat does have thru the hull exhaust? Just asking because its pretty common to have exhaust flappers lodge in the drive (or y pipe) and it will have similar symptoms to what you are describing. If you have silent choice, most will never know they have that issue because the boat performs as it should with the exhaust open.

The symptom could lead you to believe there is an exhaust restriction, but there's really no opportunity for that. The boat has "silent thunder" exhaust. It's pretty awesome. There is a water box on each side of the boat under the swim platform that fills with water and muffles the exhaust, ultimately exiting above the water line. So, it is through hull, but detoned. I took the exhaust hoses off and inspected transom and flushed out with water. It's a 5-6" opening so I doubt there is a restriction unless a squirrel made its nest in there. Both sides run equal also. Temp and water flow. This could also be a secondary ignition problem...but I have fuel pressure issues, so I'm sticking to fuel system components.

So I noticed you said after the o-ring fix you have a ton of pressure...more than you should I believe ? What are you doing about that or what are your thoughts?

Originally I had low fuel pressure due to an internal leak at the high pressure pump. Fixed that. Then we had high, erratic fuel pressure. That one was a bit of a mystery to me. One theory was an injector was clogged, another was the regulator was bad, or some other blockage.. I was suspect of the injectors due to my rpm's being down on the top end. As a precaution and to eliminate one of the possible bad components I had my injectors cleaned. Now, injectors are reinstalled. No sea trial yet, but fuel pressure has returned back down to below spec. 25-30. But this time I'm able to dead head th pump and get 40 out of the system esially. Just ordered a regulator. Good thing I love this boat!

No improvement in rpm. Once again I still am down 10psi of fuel pressure, but I'm beginning to think that issue is not the problem. We'll see.

Did you replace the regulator? From this comment, the 70 psi would have damaged it

Friday is regulator r&r

40 psi dead headed is no good.

While you are there and unrelated to my first sentence above, Check the screen where the reg mounts to the rail while you are there. Cloggage here causes higher fuel psi than normal.

No good
 

Having a rough time over here. Able to dead head the pump to whatever I want, but still a constant 30psi on the gauge with a new regulator. Maybe my gauge is wrong. Maybe the new regulator is bad. Who knows. I need to give this a rest for a while. Getting too frustrated. Time for a carb.