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VRO oil tank Vent .

F

flattop1

Contributing Member
Had boat out Tuesday everything is fine .
Go out today oil alarm. Evinrude 140 1993 .
I drained and cleaned the tank .
I noticed the cap vent was plugged .
Any chance that would stop oil flow ?
Thanks for any insight .
 
The vent is there to allow air in the tank to replace oil volume as the pump removes it. Yes, you can create a vacuum in the tank if the vent is plugged and that will prevent the fuel pump from drawing oil. The vents in these caps had issues with plugging or allowing water to enter if the tank was in a wet location. A new Oil Tank Cap with Vent can be purchased on this site.
 
I pop that little cap off and remove the vent valve parts. This allows positive ventilation and then I reattached the cap with a good solid adhesive. I don't like to see the oil reservoir out in the open or in the hot sun I like to keep them undercover and recommend that to my customers. The vent is actually a check valve and the tank can build pressure when exposed to the hot sun and force feed oil into the carburetors. To me this was an engineering blunder.... And certainly wouldn't be the first and positively not the last. We have brilliant engineering today and we all know that it's called "planned obsolescence". So different than what we had 40, 50, and 60 years ago. I lived, grew up, and worked through those decades and I will be the first to acknowledge it, and possibly the last to let it go. Brilliant engineering today actually means creating something to fail at just the right time so the consumer will say: "oh well I guess it's time to buy a new one"!.... 😔 Sigh!
 
timguy said:
I pop that little cap off and remove the vent valve parts. This allows positive ventilation and then I reattached the cap with a good solid adhesive. I don't like to see the oil reservoir out in the open or in the hot sun I like to keep them undercover and recommend that to my customers. The vent is actually a check valve and the tank can build pressure when exposed to the hot sun and force feed oil into the carburetors. To me this was an engineering blunder.... And certainly wouldn't be the first and positively not the last. We have brilliant engineering today and we all know that it's called "planned obsolescence". So different than what we had 40, 50, and 60 years ago. I lived, grew up, and worked through those decades and I will be the first to acknowledge it, and possibly the last to let it go. Brilliant engineering today actually means creating something to fail at just the right time so the consumer will say: "oh well I guess it's time to buy a new one"!.... 😔 Sigh!
Click to expand...
I didn't think about it when on the lake or I would have just lossend the cap .
Lately I try to refrain from drilling offices out due to several mishaps .
Cleaned it out good new fresh oil and still have alarm .
Added oil too fuel sono issue there . I guess after 32 years it's due for rebuild or replacement, though I did wash out the engine bay , so in my mind it may be the sensor ; doubtful.
 
Thanks
This is what I strained out the tank.
 

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Yuck. Yes I simply remove the little parts, no drilling no. I put the parts in an old pill container just to show the customers.
 
10-4 . It is in a covered location . I have another vro if I can find it . Are the knock off vro units any good . No more then I use it I am not adverse to mixing the fuel/oil . It's just so much easier to pour it in the tank .
 
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It softens them up and often times turns them punky. The more rubber into the formula the more severe the damage. The replacement VROs are a synthesize rubber composition which helps with the longevity but they are called "resistant" to alcohol. Ha! I "resist" alcohol too....but sometimes I have a Hamm's beer or 2.
 
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