Oil leak from vent pipe only after driving - 1997 Yamaha XJ 600 Diversion S-N

The fuel tank is not holding pressure or vacuum because of leak,on the filler pipe or another leak.The computer cannot hold the tank vacuum for the specified time so pops the light on.Most fuel filler pipes and vent tube for filling are one unit.

No the oil pan is sealed,unless you had a major hole. But you would have also had a oil leak.Water in oil is a sign of either a intake gasket or head gasket leak.

it is a vent pipe for engine valve covers. oil leak would indicate pressure build up in the engine...I would replace the PCV valve.

You might not see leaks if the fluid is leaking on the engine where it gets burnt off before dropping to the ground. That happened to me. Check all of the fluid levels. Engine oil, transmission oil, power steering oil and the antifreeze. Check when warm not hot, not cold. Pay special attention to the level and check once each day until you detect which is leaking.

http://waterheatertimer.org/Leaking-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#vent

Bad vent?
Improper vent? Undersized vent?
Vent termination cap located on roof has come off?
Bird nest in vent pipe?

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

any smoke from the tail pipe.if it is ,it might headgasket leaking from inside the engine or the valve stem.check the PCV system ,it might block it & oil is going to intake system.check the PCV system & the vent hose first.

Double check all area's where the vent pipe is clamped on for leaks when running, Make sure clamps are securely fastened. At that many hours its very unlikely that a crankcase seal would already be a problem unless the ATV has been driven through really bad conditions like salt water or elevated under heavy laod. Take vent pipe off & clean out. Or

it could leak oil to youre exaust pipe

If I understand correctly, your Bock gas water heater vent is causing water to leak down into chimney.
This is a very serious concern

Water leaking from water heater flue indicates improper venting.
The hot air gasses from water heater combustion contain water vapor, but the gas should vent out of house before condensate forms on pipes.
http://waterheatertimer.org/Water-at-bottom-of-water-heater.html#flue

The problem might be caused by a power vented furnace that pushes vent air from furnace down into flue pipe for water heater. As a result, the water heater doesn't vent properly.
There could also be a clog.
Light a match under water heater draft hood and see if smoke from match travels instantly upward.

There are two major concerns.
1) If vent is not working, it means that odorless CO gas is entering home instead of venting outdoors.
CO carbon monoxide is deadly poison.
http://en.wikipedia.org/wiki/CO_poisoning
This is a very serious concern
You can buy CO detector after vent is repaired.

2) Water condensate will eventually rust away vent pipes because of acidic content of the combustion vapor. It can be expensive to replace pipes, and pipes with holes pose risk of CO poisoning.

My suggestion is call a qualified plumber ASAP and explain what you observe.
Plumber will want to inspect the vent pipes, and may want to extend water heater vent pipe up further inside chimney so furnace is not pushing air back into water heater vent.
Plumber may also find blockage somewhere in the vent stack or chimney.
Also post on a professional water heater forum like the Tank to double check anything the plumber says to you. These are the pros.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

If you have no heat at all and its smoking white out the tail pipes then you have a blown headgasket. That is why you aren't running on 2 cylinders.

Check you coolant level to see if you have a blown head gasket. The tick is from not having enough oil in the engine. Oil always leaks from these but not too often its the rear main, just depends.

Does it smoke white out the tail pipes?