Mercury 1996 250 efi oil injection

[paulsboat]

is the fitting that is threaded into the VST tank at the bottom suppose to be a check valve type. I was servicing my VST tanks on my 2 motors and noticed that one allows easy blow thru and the other requires a little pressure. The one that requires pressure also acts like a check valve and does not allow backflow from the tank . The tank fitting on the other tank allows both ways . Which is correct ? My manual just shows a diagram that oil goes int the tank at the fitting .

 

[alldodge]

Trying to look up parts on the motor but having trouble without a serial number. Here is a link to the 250 DFI Optimax for serial number 1B528615 and up

http://www.mercruiserparts.com/bam/subassembly/32597/13440/170

 

[tommarvin]

Im new to outboards, bear with me here..
1996 250 EFI oil injection.
You have fuel injectors, and two stroke oil is being injected into the cylinder for lubrication.No crankcase
I didn't know that existed, thanks for bearing with me.
Ive read here, people don't clean and do maintance on there oil injection, oil stops, motor burns up.
They get mad and say there going to remove the oil injection and premix from now on, after they rebuild there motor.

 

[Dukedog]

My manual just shows a diagram that oil goes int the tank at the fitting .

plain jane efi motor.. one way "in"... "no go" out.

 

[alldodge]

I'm no OB guy either but the OP said he has a VST, in the IO world that is used for fuel