changed fuel filter and didnt plug wire back up and went to lake and motor started and idled fine but when tried to take off it would only bog down and after about 30 sec. buzzer made a solid beep. Is this because water wire was not conected or is their other trouble.

Also replaced gas lines,gas pump,pump up bulb,cleaned fuel injection pump screen and all of vst box with new o ring 3 months ago has been running good.

Start with a water pump "kit". Solid buzzer is heat only.

isnt the solid buzzer for water temp and oil level

Its an overheat alarm only. Oscillating "beep" is oil and/or water in tha fuel filter on efi motors...........

Overheat doesn't read water temp. It reads head temp.....

had water pump installed 6 mo. ago water presure shows 3-5 at idle 10-12 running.

Really makes no difference when a heat problem jumps out at cha. With good pressure at idle and/or speed. Could be T-stats. They don't effect pressure. Doesn't sound like a poppet problem. It usually does effect pressure in one way or another. Complete kit or just impeller?

Took it to shop and ended up being vst pump that I had replaced 3 mo. ago with a used pump to save money bad idea getting new merc. brand pump thanks for all ideas hope to be fishing by weekend.