2000 mercruiser 3.0L rough idle and hard start

[Dion Schoening]

I have a 2000 Sea ray 180 with a Mercruiser 3.0L motor. I just changed the fuel pump to a Carter model number m60337. on the water the boat runs good above 1000 rpm, no hesitation Just gets up and goes and sounds good . but uber 1000 rpns idles like crap. I tried to set the idle mixture and idle screws under a load in the water but once going below 1000 rpm the motor does want to run very well. a couple times the motor died and in order to start it i have to go full throttle as if it's flooded. most of the times even if i used the key to shutdown motor I have the same issue, I have to go to full throttle to restsart. the funny thing is when I brought it home and put it on the ears to flush the motor it was starting right up in idle. still rough idle but would start. after what I have read here think I need to rebuild carb. or get a new one.

just wanted some input before I go down that road in case it much be another issue I am missing. thanks in advance for the help

 

[achris]

How was it before the pump change? Sounds like the pump is putting out too much pressure and flooding the carb. Check the pump output pressure.

 

[Dion Schoening]

was running pretty good before change, any ideas on where I can get a guage. harbor freight only had a huge set but it didn't appear to go low enough for the low pressure pumps

 

[Dion Schoening]

I checked the pressure throw 4.5-5.5 when trying to turn it over. not sure how would check it while motor is running.

serial number is OL631940