oil injection delete directions for 1999 225hp efi 3litre 6cyl mercury outboard

[gerrydi69]

I have read on these forums about others who have deleted the oil injection, and now premix the 2 stroke oil in the gas tank. I have had the 4 beep alarm randomly coming on. I make sure the 2 stroke oil tank on the motor is full. I have checked for air leaks coming from the remote oil tank to the motor and found none. I cant find anything on the internet specifically for a 1999 3 litre 225hp efi mercury outboard oil injection delete. Any help would be appreciated. Hopefully this thread was created properly as per rules on the forum.

Gerry

[OnPad]

There's a couple ways of going about it.
I like this way.
521415

You can also purchase a 3.0l block off plug. They cost about double their smaller cousin.

[gerrydi69]

Hello Onpad. I purchased a 3 litre mercury v6 oil injection block off kit. Is this the kit you referred to as the smaller cousin? Also do you know of any detailed instructions for the oil delete that have any pictures for a 3 litre v6 Mercury outboard?521427521428

[OnPad]

The smaller cousin I referenced, is the 2.0/2.4/2.5, but looks like you already found a block off kit.

If you do a browser search (225 efi oil injection delete), your going to come up with alot of info, some good, some bad.

When you start taking oil tanks, and pumps off, everything is going to be pretty straight forward. Plug a couple holes, and unhook a couple wires, that attach to the stuff your removing.
The post, I pictured above is all you need. Read it ten times, if you have to, or screenshot it.

[OnPad]

Sorry if that sounded snarky. I don't know if a good, photo riddled thread exists. That's the best one I could find.
You should make up a nice one with pics.:reddevil:

A-g, disregard f in photo.

[gerrydi69]

No worries. I did screen shot the directions you had attached. I read it about 10 times also. Thank you for pointing out I should disregard (F). Letter A says the 2 wires that went to the oil reservoir are left open. Does (left open) mean leave the wires disconnected? In letter (E) it says replace with a pipe plug. Is that one of the small bolts included in my oil block kit, or will I need more parts?

[OnPad]

Yeah just leave the wires disconnected.

You can purchase pipe plugs, if you want to do it up nice.
The plug for the pulse hose will be easy to find at your local hardware store. The plug for the bottom of your vst is a little tricky to find, and not necessary. As there is a check valve in the fitting on the bottom of vst. Some people leave it open, I zip tie a bolt in the end of a short section of hose, off this fitting, Which could be done to the pulse hose also.

[OnPad]

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The pump. Looks like throttle and shift bracket needs to be removed. At this point you can either loop the oil in, oil out together, and leave pump installed. Or remove pump, bushing, and drive gear, which is replaced with the "block off kit".

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Oil inlet in vst, with a check valve in it. Can be left open, blocked, or replaced with a plug if you can find one.

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Pulse fitting (starboard side), which can be removed and replaced with a hardware store pipe plug. Or blocked off.

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Idk wtf is going on here with the tank wires. So I could be wrong, on leaving em disconnected. I unplugged one and got no alarm.

Guess I should fix my own s--t that's Jerry rigged! Don't use that boat much, she slurps lots of fuel.

[gerrydi69]

I have a pdf manual for my 99 Mercury. Your pictures with the directions in your last post are just what I needed. I live on the nature coast of Florida and we have had a lot of rain today. I will do this oil delete in the next several days. I will post pictures. Thank you for your time.

[gerrydi69]

On pad, if I opted to loop the oil in, oil out together, plug the pulse line and leave pump installed. It seems easier to do it that way. Do i gain anything? Or lose anything?

[OnPad]

After thinking about it I don't think a pulse line exists to the pump, and edited my post above accordingly.

If you have the block off plug, I would use it.
It's not going to make a difference either way, but looks better with the plugs.

[OnPad]

If you leave the pump make sure there's oil in it.

[OnPad]

I didn't delete that particular engine, and never done a 3.0l, but have a garbage sack full of 2.5l stuff I've deleted. Looks like nearly the same system. The pulse line probably goes to the tank in the boat.

[gerrydi69]

Hello Onpad. I'm leaning towards leaving the oil injector connected. You mentioned leaving oil in it. How do I ensure leaving oil in the oil injector?

[OnPad]

Just leave the oil in the pump, and hose. Loop the in and out together.

Nothing is going to jump out, or fall in your engine, if you want to remove the pump. Your call.

[gerrydi69]

Hello Onpad. I have finished my oil injector delete. I removed the oil reservoir, and left the wires disconnected. I left the oil pump attached. I used pipe plugs and zip ties on the in and out inlets of the oil injection pump,for the pulse fitting, and the vst oil inlet. What ratio of oil do I mix in the fuel?521686521687

[gerrydi69]

521688521689521690

[OnPad]

I mix 50:1 with my 225efi. 40:1 in 2.5 litre's.
Might be a good idea to get the straight gas out of the filter, and fuel line.

If you use a short section of hose, and attach the in and out on the pump, It allows the pump to recirculate oil in a loop.You wont have to worry about burning up the pump by blocking off flow.

My oil pump looks to be blocked off much the same way as yours,...hasn't started on fire yet,.....but not really the best way. Hypocritical 02 cents.

[gerrydi69]

521691 The hose sizes are different for the inlets.

[OnPad]

521691 The hose sizes are different for the inlets.

I noticed that. Easier said than done.

[gerrydi69]

Do reducer hose connectors exist for oil lines?

[OnPad]

I'm sure something exists. Or you could use vinyl hose and expand one end with some heat.

[gerrydi69]

521693This T came off of the oil reservoir. It has both sizes of inlets I need for the hoses. Do you think this would allow the pump to recirculate oil in a loop?

[OnPad]

If you can blow through it from the little end, and it comes out the big end, yes.

[gerrydi69]

521695521696521697521698 I have connected the in and out inlets on the oil pump injector. Does the oil injector still have oil in it, since I didn't remove it? Do I need to add oil to injector loop I created?I will mix 50 to 1 and run it today.

[OnPad]

Add a little oil.

[gerrydi69]

I'm trying to figure how to upload a video. When I started the motor it ran and sounded good. An alarm beeping as well as the temp and oil gauge red lights were alternating flashing red.

[OnPad]

My only service manual is for the older stuff. Try hooking the oil tank wires to each other?
Does tank in the boat have any wires going to it?
How about a rotational sensor near the oil pump?

If you want to post a video. You need to post on youtube, then post a link here.

[gerrydi69]

I made a jumper wire connecting the 2 oil resovoir wires. I turn the key and hear my fuel pump and beeping with temp and oil alternating red light. After about a minute the oil light remained on but the beeping stopped. I had added oil with a syringe into the oil injector hose loop. When the motor was running I saw the oil injector hose loop moving the oil through. So the alarm kinda went off with just an oil light on the gauge. The motor sounded good and I revved up in forward and reverse.521711521710521712

[gerrydi69]

521713

[gerrydi69]

https://youtube.com/shorts/SC9WOP-xVew?feature=share

https://youtube.com/shorts/SvaEC-fZ41A?feature=share

[OnPad]

Not sure what to tell ya. I think the blue oil cap wires can be unhooked? Disregard hooking em together. Maybe your ecu has some codes it's throwing? I don't know squat about that style ecu, and ddt to read it. Possibly unhook your battery for reset?

Was this engine running well before you deleted oil inj.?



I just got back from ripping lip, and blowing the cobb webs out of mine. Looked around a little more, blue wire was unhooked on the tank low oil sensor. So I unhooked the other and zip tied the bullet connectors back.
Looked for a rotation sensor. Doesn't exist, on my 97.

I also had a gauge like the one you have. I don't remember how it acted, before I removed it years ago, and replaced with a temp and seperate water pressure gauge. Whatever that's worth.

You need someone smarter than me, at this point,...probably.

[gerrydi69]

Yes the engine was running ok before the oil injector delete.521766 I was reading my manual and found information on the alarm and alternating red light. I will run some tests.

[OnPad]

Check your wiring where you removed the pulse hose on starboard side. The tps and temp wiring is near that area. Temp is brown, or tan, and also goes to the head.

[gerrydi69]

I think my air temperature sensor is good. I checked the wires out in that area. I thought they looked okay overall.521776 I tested the air temperature sensor 521783521784 It seems to be good. I also tested the head temperature sensor. 521785521786 The head sensor seems good also.

[gerrydi69]

521781521782

[gerrydi69]

https://youtu.be/B84k5B2_BlY After I reattached both sensors. And I disconnected the jumper wire connecting the 2 oil resovoir wires. I turned the key before starting the motor with no alarm or flashing red gauge lights. I started it and ran it for several minutes with no beeps or redlights. I'm not sure if that means it's fixed. Or if it means it wasn't broke.

[OnPad]

Your fixed up. Don't forget to add oil.