wow, so much help in so little time.
Here are some answers to your comments/questions.
1) I was in the water
when I changed my fuel
injection pump. My 12" 3-blade prop is the same prop as before the F.I.P. change. I hand cleaned the prop last month before going out motoring. When my prop had barnicle growth, I couldn't even get over 1600 rpm's and 3.5 knots. With the prop clean, I'm back to my normal 2000 max (if I'm lucky) state at 5.7 knots in the calm.
2) my prop shaft is not over heating
or even getting hot. In fact, i did have to tighten up the stuffing box for the first time in my life the other day, because I was getting too much water
drip. But after tightening it up, and then backing it down a little, it still runs cool and with minimum water intake. I also have a grease fitting that I pump with grease when the boat is stopped. I will try diving
soon and check to see if I can move the prop shaft by hand. I forget whether I could do it easily when I had the boat out last year, but I imagine if I couldn't move the prop by hand then, I would have been concerned enough to look into it.
3) the transmission
is the same, the old Hurtz or whatever the main one was back then, with one gear
forward and one backward. The tranny runs cool and the fluid is like new. I think it's a bright red (from what I remember). I checked it last month.
4) My exhaust
system is working fine. I removed it two years ago and cleaned it out with muriatic acid.. Put all new hoses on, and it works great. No over heating
problems since then.
5) I keep my bottom clean. Though I haven't pulled the boat this year, I did last year and had the same problem after repainting the hull
It feels like it just isn't getting enough fuel
, or the fuel supply stops at a certain point.
I imagine the F.I.P. is properly timed, or I doubt I could get the high RPM's at idle. Is this correct?
Still wondering how large of pre-lift pump fuel lines I can add without creating more problems.
The only thing I didn't change was the fuel exhaust
line that goes back to the tank. And somewhere I read recently that a clogged discharge line could interferr with the max RPM
. I'll change or clean that line next.
I keep new fuel filters always installed and my fuel tank
is very, very clean.
Thanks for the info that the gonvernor on the F.I.P. can't be out of adjustment if I'm getting 3600 rpm's at idle.
And thanks for all the help too.