1999 40 hp mercury dies when given throttle

[kylembaca]

Ok guys this is puzzeling me. When I run my boat motor in neutral I can rev it up all the way without it dieing and it is very responsive to throttle adjustments. It idles great about 825 rpms and does not die, also goes into reverse and forward without dieing at idle throttle. Once I give it throttle the motor just boggs down and dies in forward and reverse, once it dies it will start right back up and i can rev it up in netural.

Here is a list of things I have checked.
-Gas is new and no ethanol.
-all fuel lines replaced and the buld stays hard when running
-I have checked the carbs and they are all spotless
-the little fuel pump appears the be in working condition all gaskets in good shape
-the spark plugs are firing on all 3 cylinders

Any help is greatly appreciated.

 

[tazrig]

Re: 1999 40 hp mercury dies when given throttle

My knee jerk reaction is it sounds like a clogged fuel filter on the motor side or the fuel pump itself. When was the last time you checked and or replaced the screen filter? The bulb should be squeezable, not real soft but squeezable when the motor is running if it is rock hard then it sounds like not much gas is flowing into the engine. Enough to idle it and rev it in neutral but when you put it in gear and put it under load and the demand for gas is much higher it dies.

Also here is a link to an engine manual for your motor might help for this and other info

http://boatinfo.no/lib/library.html#

 

[kylembaca]

Re: 1999 40 hp mercury dies when given throttle

tazrig, thanks for your post I will stop at wal-mart on my way home today and get a new fuel filter. I will update you on my progress.