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150HPDI will not auto fill small oil tank on side the motor

Posted on 7/5/26 at 10:49 am
Posted by LSU Neil
Springfield
Member since Feb 2007
3627 posts
Posted on 7/5/26 at 10:49 am
failed oil transfer pump, a clogged inline filter, a stuck float sensor in the engine tank, or corroded wiring is what Google says.

Changed the tank oil pump
Cleaned the small tank filter
Float inside small tank works fine
No idea about wiring yet however you can fill the small tank using the primer button on the side the motor.
Essentially I run ever how long until the alarm goes off, kill the motor, remove cowling, fill up the small tank using the switch and go again. Repeat as needed.
Ideas?
ETA: this motor was removed off my other boat and installed on a different boat.
Unless there is wiring not connected somewhere else, this thing should be working in my opinion.
This post was edited on 7/5/26 at 10:53 am
Posted by Lsutigerturner
Member since Dec 2016
7286 posts
Posted on 7/5/26 at 1:41 pm to
Have you searched the hull truth and some of the Yamaha forums?
Posted by Stat M Repairman
Member since Jun 2023
3070 posts
Posted on 7/5/26 at 4:22 pm to
Check whether the tank is vented and the vent is clogged. Possibly through the cap.
Posted by TxWadingFool
Middle Coast
Member since Sep 2014
5675 posts
Posted on 7/6/26 at 12:22 pm to
On a Mercury you have to purge the tank so all the air is out of the system, no idea if it is the same on the Yam. Run it with the cap off until it fills and then starts to run over and pop the cap back on.
Posted by LSU Neil
Springfield
Member since Feb 2007
3627 posts
Posted on 7/6/26 at 7:50 pm to
Have not checked that. Definitely will!
Posted by LSU Neil
Springfield
Member since Feb 2007
3627 posts
Posted on 7/6/26 at 7:51 pm to
I believe that I’ve gotten all the air out by using the primer on the side of the motor but will check it out
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