Originally Posted by TresMon
I installed a new oil pump on my Raider (2.4 L) a year ago. Twice since then the oil pump apparently lost prime on me while I was way back in the mountains off road. Now it has happened again.


I thought the oil gauge was a good suggestion - guess not. Why did you replace the oil pump?

I have never heard of pump losing prime, unless low on oil. I have worked on oil pumps (not Montero) replacing gears/seals, just pre-grease them and start the engine, the vacuum created on start pulls (actually air pressure pushes it) oil into the pump. After shut down the oil should leak back to pan - so re-prime every time. I think prime would apply if check valve in intake tube.

Is it possible a seal has gone?

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles