1999 Mercury 115HP Jet Drive Lacks Power

[skeeeter]

I have a 1999 Merc 115 HP. The motor lacks power off idle. Recently I replaced the water cover that had cracked on the rear of the motor. The crack was causing water to spray on the bottom spark plug and was causing a severe missfire. When I replaced the cover I changed the Spark plugs I also checked the compression which was even at about 120psi across the board. After that repair it ran great for a week and then the power loss came back. I checked for spark again and its good. The compression is still good. So Im wondering if anyone has an opinion on the most likely culprit for fuel problems. I think that it is the accelerator pump, If I start the motor I can depress the rod that sticks out of the pump and I get basically no response from the motor until it is fully depressed. Any ideas would be great the Salmon are biting and I need to get back out there.

 

[Mi duckdown]

Got pics of crack

 

[skeeeter]

no no pics. I recycled the old cover that had a crack. It had cracked on the bottom near the lowest cylinder. It looked like it hadnt been properly drained last winter and had frozen and caused the water cover to crack.

 

[skeeeter]

So just an update. The accelerator pump pushrod was worn at a bevel. I replaced it with a new one. I also sealed the area above the jet drive where it attaches to the motor as I could see water spraying out between the two pieces when at WOT and on plane. Those two repairs seemed to have helped but it still does not have full power. I guess im left with the fuel pump or four carburetors. Anyone know what the fuel pressure spec is supposed to be and where to check it. I would assume its close to a car with a carburetor probable 2psi.... But obviously thats a guess. Please help!