1987 90 hp bogging down

[skislolom]

I have a 90 hp evinrude that runs great except for one thing. At high speeds the boat bogs down. It idles and goes slow excellent. But when I speed up to plane out the boat it runs for a couple of minutes and shuts down. Everytime after this the primer bulb is flat. I have done many things to troubleshoot because thats what seems to be the only thing to do. So far I have installed new tubing and a primer bulb from gas tank to the motor. I have also replaced the fuel filter located in the motor. Also, thinking it was a venting problem, I removed the gas tank while running but this did not cause considerable help. Finally, I have added a gas solvent to the water made by Quicksilver to remove water in the tank. I need some more help on what to do next. Any help would be great. Should i change o-rings at the connectors or do I need to look at the carbs or could it be the pump. Thanks.

 

[zoom]

Re: 1987 90 hp bogging down

There's a check valve where the hose attaches to the gas tank. Clean/Replace it.

 

[rcgt78]

Re: 1987 90 hp bogging down

Hi!<br /><br />I'm pretty sure that the problem is fuel restriction before the primer bulb. At higher speeds there is not enough fuel for the engine.<br /><br />Thus the tank get air? Try with another tank!<br /><br />Good Luck!<br /><br />Regards,<br />Robbi

 

[skislolom]

Re: 1987 90 hp bogging down

Thanks for the advice guys. From the primer bulb the hose apears to go to a brass fitting and then this fitting is screwed in to an aluminum elbow and then finally this is screwed to a long aluminum pipe that extends to the bottom of the tank.(the tank is built in). So is the check valve the bass looking fittin(this is what i bought new) so it probably isn't it. Any help for finding the check valve would be great. Thanks for the help so far.<br />John

 

[G DANE]

Re: 1987 90 hp bogging down

Try to testrun it on a portable tank, you will know if thats the problem then.