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Ted if you go to mercruiser parts or Mercury parts look for 377 MAG MPI BRAVO EC 1A623185 & Up and select that one

Good point

Sound like more than enough pressure, only thing left is flow rate I would think. Bravoits and or a leak will cause bubbles

ok, I edited my previous response before I saw your latest

With you being in salt water it very well could be. Could take a short piece of clear hose and place it inline between sea pump and HE. What does the G3 say the water pressure is? Might take the poppet apart and replace the spring item 5, or at least have a look to see if it's clogged...

What were they living on, they cannot digest wood

One of the ones on item 113 in first pic has to rings and one of them is square and split like a compression ring. Just sent a email to Porter to see if they can provide the correct part numbers

Having major issues finding parts to rebuild my brad nailer I need piston ring 180457 which is had to find. Did find it and many call it a O-ring which it's not it's like a piston ring so has a gap. Found it on parts warehouse so have a idea. Item 113 has one O-ring and the piston ring...

Nice work

Not seeing anything in the manual about thermal paste. It wont hurt but not sure it has any effect to help.

no worries

That's different, I have left the keys on to see if hours went up and they didn't change on Mercs

First need serial number? When was impeller last replaced? Might be the poppet valve

Don't know of any Merc which used the MEFI 5, it was only used Indmar and VP

Push rods normally change when lifters do

Welcome You cannot get another one but you could probably get one made by a vinyl print shop.

Don't know but similar issue with Buddies old Raytheon system. His system has lost GPS signal and has yet to figure out where, but now radar doesn't work.

Park under cover or cover HL when parked and they stay clear

PCM doesn't know what the pressure is, only what it should be

Don't know what to think without testing, but IAC would not be first thought because it will start without giving more throttle. Looks like you have a EC (Cats) motor. The easy check is the pressure at the rail, but do get it checked if a scanner is available Running premium gas just cost you...