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Old 07 June 2016, 13:17   #1
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Mercury 50 3 cylinder with fixed head, oil tank filled with fuel

Hi, just took the cowling off to find the 2 stroke oil tank filled to the brim and it was half full last time I looked, took the cap off to find fuel and oil in tank.
Obviously the one way valve on the fuel line next to the oil pump has not worked correctly, is this due to me leaving the fuel line connected and pressure building up in tank or just the valve being no good, has anybody else had this issue?
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Old 07 June 2016, 13:33   #2
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As a guess fuel tank breather shut tight pressure built up in warm weather which can be quite significant and pushed pass the valve taking the easy way to release pressure through the oil tank?

Cheers
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Old 07 June 2016, 15:39   #3
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That was my guess Geff, just hope its ok, will drain oil tank tomorrow and see what its doing when running
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Old 07 June 2016, 16:50   #4
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Hopefully when running even if the non return is a bit weak the fuel will be pulled to the carbs creating a negative for the oil to flow. Under normal conditions I don't suppose the non return needs to withstand high pressure but when the fuel line was on it was a different ball game. I would swap out the non return in any case to be sure and leave the breather just cracked to prevent pressure build up.
Hope it's ok cheers
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Old 07 June 2016, 18:28   #5
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Yes will do, just ordered some parts today for another engine, typical
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Old 08 June 2016, 12:56   #6
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Took valve out today to find it passing both ways so presume its knackered, new one ordered. So this is a problem leaving tank connected so will have to remember to disconnect in future, learn by my mistakes
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Old 08 June 2016, 13:00   #7
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Quote:
Originally Posted by Stubber View Post
Took valve out today to find it passing both ways so presume its knackered, new one ordered. So this is a problem leaving tank connected so will have to remember to disconnect in future, learn by my mistakes
yep we all do it stubber still sorted now cheers
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