OMS pump 1995 175 evinrude intruder

[jtcarter]

Well back to square one again. Still getting air into the fuel line. Upon visually inspecting the oms pump on the oil side i noticed it was leaking out of the bottom of the pump right where the star screws are. I notice the screws weren't very tight. I ended up taking the thing apart on the oil side and the fuel side. Inspected the diaphragm gaskets on both sides and didn't see and visual tears or evidence of one leaking into the other.

Recently i fixed two carbs that i could push the gaskets into the bowls with little effort from a flat head screw driver. I start the motor in the drive, ran it on muffs and i watched the clear see thru fitting inside the hood. It remained solid. Well i get to the lake confident that maybe i fixed this thing finally and it lets me down again. It seems its right back where it was to begin with except this time after my first run it won't even stay running at idle speed and i barely feathered it to plane to make the run back to the dock. We changed all the clamps on the vro to clean up a few leaks. After letting this thing sit after running it takes two maybe three pumps on the primer bulb to get it hard again. Its still sucking air somewhere.

Man i'm at a loss and desperate for a answer. I fear that if i spring for a new pump i may still have the same problem.

I'm going to put the old pump back on it and run it in the drive, i reassembled it and tightened up the screws, see if it still leaks oil out the bottom, if it doesn't i'm going to have a tough time justifying buying that new pump.

Somebody tell me something i'm overlooking or give me a suggestion. Might be time to junk the vro altogether and go with two regular fuel pumps although i don't have any idea how i'd fabricate a bracket for them.

Kind of makes me wonder if the carbs are still sucking air in somehow, this thing is one big headache. Its just about mercury time.

 

[jonesg]

Re: OMS pump 1995 175 evinrude intruder

I think if air is getting in the fuel line the oil pump will cycle faster and make for oily sparkplugs, so if the plugs aren't oily the leak is after the pump inlet.

I look for air leaks by spritzing ether starter fluid around fittings, if its drawing air you'll hear it at idle.

What do your sparkplugs tell you, if theres a carb running lean due to air leak it should indicate on the sparkplug.

Heres what I mean by fuel leak before the pump.
http://www.youtube.com/watch?v=SEbW-6eOc5I&feature=channel_page

 

[jtcarter]

Re: OMS pump 1995 175 evinrude intruder

I pulled my plugs and they all had a nice brown tint to them. I also replaced the old hose clamps with those rachet style the other day. The only noticable leak i could find was the oil leak on the bottom of the oms. Like i said the screws weren't very tight. I was out early yesterday and it was smoking a little more than usual it seemed. I don't know, i've been over every inch of this thing, replaced all hoses prior to the pump with quality stuff. I even replaced every clamp on the pump because i could twist a few of the hoses and they'd move. At this point a leak before the oms is highly unlikely i would think. Maybe the oil leak was causing the air leak. I really don't know at this point and highly flustrasted with the whole mess.

 

[dingbat]

Re: OMS pump 1995 175 evinrude intruder

I don't know, i've been over every inch of this thing, replaced all hoses prior to the pump with quality stuff. I even replaced every clamp on the pump because i could twist a few of the hoses and they'd move. At this point a leak before the oms is highly unlikely i would think. Maybe the oil leak was causing the air leak. I really don't know at this point and highly flustrasted with the whole mess.

I had a similar problem on my 200.

Everything beyond the OMS is under pressure so that eliminates a vacuum leak on everything between the cylinders and the OMS which only leaves something between the OMS and the fuel tank

Let start at the beginning. Have you replaced everything between the OMS and the fuel tank? Anti-siphon fitting on the tank? Did you change out the primer bulb? How about the water separator filter?

 

[jtcarter]

Re: OMS pump 1995 175 evinrude intruder

I had a similar problem on my 200.

Everything beyond the OMS is under pressure so that eliminates a vacuum leak on everything between the cylinders and the OMS which only leaves something between the OMS and the fuel tank

Let start at the beginning. Have you replaced everything between the OMS and the fuel tank? Anti-siphon fitting on the tank? Did you change out the primer bulb? How about the water separator filter?

Took the anti siphon valve off of it. I took it off and put it back on last year, didn't make a difference. Tried a 6 gallon tank, it did the same thing. All i know is first run of the day it gives you no problem. Once it sits, it takes a couple of pumps from the bulb to get it pressurized again, sometimes more than others. The primer selinoid clicks immediately sometimes after you shut it down, other times it takes longer. This has been the craziest deal i've ever experienced. I've checked spark in the driveway on all cylinders, good on all. Plugs look like they should, no oily ones or ones that look lean, just a nice brown tint. Its coughing and spitting worse than ever right now though. I'm might need to turn the idle screws out in the carbs, that wasn't the answer last time either, but it did seem to a least idle when i did that.

I've never been able to get the sneeze out of it, or prevent it from stalling when trying to come out of the hole.

I don't have a water seperator, i don't use ethanol (crapanol) fuel either.

Oh sorry, got carried away, the answer to your question is yes. New fuel line from tank to motor. I tried the 6 gallon tank for obvious reasons, that ruled out the tank. Its on the motor side, is it in the carbs? oms? vaccum pump? Crank case seal? Is the question that i wish i had the answer too.

 

[jonesg]

Re: OMS pump 1995 175 evinrude intruder

The bulb is supposed to go soft after the engine starts, its just free flowing.

I would start again, re check spark with a gap tester, 7/16th inch gap.
Have you rebuilt the carbs with new kits?

The way you are writing, its very hard to see exactly what problem you are complaining about "first run of the day it gives you no problem"

And yet " Still getting air into the fuel line. "

So air in the fuel line isn't a problem?
Sounds like a problem to me.
Doesn't make sense.

Do you have the proper factory service manual?
Has it been lync/sinc'd ?

Turning the idle jets on mine doesn't do anything but loosen them.
They are fixed, numbered and sized.

I find it helps to write the symptoms down, get things organized.
Take a break and just ponder it then regroup.

 

[jtcarter]

Re: OMS pump 1995 175 evinrude intruder

The bulb is supposed to go soft after the engine starts, its just free flowing.

I would start again, re check spark with a gap tester, 7/16th inch gap.
Have you rebuilt the carbs with new kits? Rebuilt them all last year, had to sand the carb bowls a little to get them flat again.
The way you are writing, its very hard to see exactly what problem you are complaining about "first run of the day it gives you no problem" I was just reponding to the post above. It will get on plain and run fine until you get somewhere and shut it down for a few minutes
And yet " Still getting air into the fuel line. "

So air in the fuel line isn't a problem? You can set and watch the clear fitting that transitions your 3/8 fuel line to 5/16 on the inside of the motor. Periodically you see a bubble go through there then it goes back solid. It then just continues to repeat that process.Sounds like a problem to me.
Doesn't make sense.

Do you have the proper factory service manual? Seloc
Has it been lync/sinc'd ? The spark and advance occur at the exact same time, so yes on this
Turning the idle jets on mine doesn't do anything but loosen them. Air idle screwsThey are fixed, numbered and sized. I realize the idle orficies are fixed, # 40 on mine.
I find it helps to write the symptoms down, get things organized.
Take a break and just ponder it then regroup.

Its been at a mechanics shop (omc mechanic). His answer was junk the vro, tried that, put a fuel pump on it. It didn't fix it. I've checked spark on more than one ocassion. They all jump at least a 7/16 gap if not more, i did't use a gap tester just a set of pliers. Motor changes tunes on everyone of them when you get the plug wire close enough to get the spark jumping. I think i'm going to take one of the carbs off and take it to my mechanic, make sure everything is good on that, float level wise. I set them by what the book called for. I know there is no trash in the low speed pickup tube, we ran a thin wire through all of them not long ago.

My mechanic seems to think its a crank case seal bad on the fuel side, i'm starting to think he may be right. I'll go through the carbs again right in front of him and check all the obvious one more go around before i go tearing into this thing. I really would like to avoid that if its not necessary.

 

[dingbat]

Re: OMS pump 1995 175 evinrude intruder

I?m confused. Where are you seeing this bubbles?

Everything on the output side of the OMS is pressurized. Any leaks would well?.leak. Bubbles in the fuel system would indict a vacuum leak which can only occur on the input side of the OMS.

Have you checked or changed the pulse limiter fitting yet?

 

[jtcarter]

Re: OMS pump 1995 175 evinrude intruder

I?m confused. Where are you seeing this bubbles?

Everything on the output side of the OMS is pressurized. Any leaks would well?.leak. Bubbles in the fuel system would indict a vacuum leak which can only occur on the input side of the OMS.

Have you checked or changed the pulse limiter fitting yet?

The 3/8 fuel hose comes up to the motor hooks to a clear fitting that goes through the hood. Inside the hood it changes to 5/16 fuel line up to the oms pump. You can put a flash light on it and watch bubbles suck through there periodically. It will go solid then you'll see a bubble, over and over again.
http://shop2.evinrude.com/ext/index.aspx?s1=983697f81b9a39fdbbebd777d552957a #21 on the diagram. Anyway i've tried a seperate 6 gallon tank and it still sucked bubbles through it. I changed a few more clamps started it and it stayed solid while i ran it here in the drive. Took it to the lake and it was worse than when i started. I get the thing back home, put it on the muffs and watch #21 and it was sucking bubbles again. Well since then i've changed all clamps on the oil side and fuel side coming from the gas tank and oil resevoir leading up to the oms pump. Also changed #18,#63,#65 o-rings in that link. I've ran it on muffs again in the drive and again i don't see any air bubbles. I guess the only thing left to do is go dump it in again and see if anything has changed. I'm not very confident i fixed anything. I hate to keep banging my head into the wall over this thing. I'm about to go dump it on another mechanic and give someone else a shot at it. Its just about whooped me. The pulse limiter is the blue one, a supposed upgrade from the stock version.

 

[Beernutz]

Re: OMS pump 1995 175 evinrude intruder

It's a longshot, but I had a similar experience with my '96 Johnson 60 degree 115. I went thru everything on the intake side, all the way down to the reeds, with no success.

It turned out to be a failed lower crankshaft main seal. It was allowing water to enter the bottom crankcase, fouling that plug. There was faint evidence of water on the plug and inside the cylinder.

 

[aj306]

Re: OMS pump 1995 175 evinrude intruder

I am not sure what problem you are trying to overcome but if you have air in the line the only system will be excessive oil usage in most cases.

If you are trying to correct the Intruder/Faststrike bog when first giving throttle this is usually caused by timing roller being incorrectly adjusted. The timing roller should start to move the spark advance arm at the same time the throttle plates start to move.

My 96 intruder had the bog and also would cough just like a fuel problem but the only problem was the timing adjustment had slipped. After the simple adjustment the engine ran great.

 

[Okee Jimmy]

Re: OMS pump 1995 175 evinrude intruder

Hi, did you check the fuel pump on the vapor seperator? I have worked on a couple of 60 deg motors with fuel starvation issues, and it turned out to be one of the check valves had popped out of the plastic housing. There is also a float, and needle valve in the vapor seperator that may be sticking. Hope this helps, Jimmy.