Fuel help! Merc 200 20hp

[10ftinvader]

My late 70s mercury 20hp thunderbolt wont stay running. I prime, pull choke and it starts up. Push in choke and after 20 seconds it starts running faster and then chokes out. If i keep squeezing the ball then it will keep running. Carb was cleaned. Lines checked for air leaks. I suspect the float bowl isnt filling fast enough? Theres 2 screw type jet adjustment things, anything to do with spinning them? Help me out here guys, the bay is calling for me.

 

[racerone]

Repair the fuel pump !

 

[10ftinvader]

Repair the fuel pump !

Is it the little rubber piece of material your talking about? The screen was spotless when i took it apart aswell

 

[racerone]

When you operate the ball you are now the fuel pump.----Therefor you need to find and repair the pump on the motor !

 

[10ftinvader]

When you operate the ball you are now the fuel pump.----Therefor you need to find and repair the pump on the motor !

Thanks for your intrest racerone, means alot to me. The pump seemed likely to me. Is there a chance that the float isnt working right causing a small amount of fuel to trickle in? The priming ball doesnt stay hard after it runs but if pumped it stays hard for a few hours.

 

[racerone]

The priming ball is a manual fuel pump.---There is absolutely no reason for it to be hard once the motor has started.---It has done it's job.