Bleeding oil injection system

76gunner

Recruit
Joined
Jun 15, 2006
Messages
5
I have to replace the oil tank on my mercury 225 efi because the magnet separated from the float causing the gaurdian system to sound. I have ordered the new tank but have since found out that I need to bleed the system. Is there anyway to do this without putting it in the shop.
 

gss036

Commander
Joined
Jan 18, 2003
Messages
2,914
Re: Bleeding oil injection system

Not that familiar w/EFI, but pretty simple. I take you are talking about the tank on the engine under the cowling? Take the old tank off, install new one, put the oil line back on, take the oil line at the pump loose, plug, fill the tank and let the oil fill the line and connect it. Fill your tank on the engine, start the engine on the hose or in the water, loosen the cap just enough to allow air to escape and oil to start to bleed through the cap, tighten just enough to keep it from leaking.
 
Joined
Sep 12, 2007
Messages
9
Re: Bleeding oil injection system

Got a better idea. Most Mercury oil injection pumps have a removable screw to allow the pump to bleed after you have repaired the oil injection lines (or in this case tank). Bleed the line as described without running the engine as above in the preceeding reply. Connect a remote fuel tank with a 50:1 fuel:eek:il mix. Mark the level of the oil tank with a marker. Remove the bleed screw. Run the engine on the remote tank and wait til oil is ejected from the bleed screw. When oil is present in a continuos streem then reinstall the screw. Technically there is a procedure for testing the output of the oil pump by checking the volume pump whilst the pump index marker is alighn, for a set time period. If you continue to use the remote tank with the oil/fuel mix and check to see that the oil is being consumed from the oil reservior this will give you a fair indication that it is working correctly. This is not a fool proof method but if in dought and/or you are not confidend take it to your local mechanic. This procedure should be able to be compleated within the hour of starting the job.:):):)
 
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