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Keep checking the oil level and the transmission fluid level to make sure they stay full, but there should be no oil in the gas tank.
There may be water, however, and it may be brown like oil.
Water will sit in the bottom of the tank and make rust underneath the gasoline, since gasoline floats on water.
There's an o ring on the bar mount. It seals the oil passage from the tank to the bar. It will leak there. The tank itself may have developed a crack that will leak. The rubber lines from the tank to the pump can leak if they are cracked ir gummy.
Stand the bike upright. Remove the dipstick from the oil tank. Remove the drain plug on the bottom right side of the frame. While the oil is draining, replace the oring on the drain plug. Remove and replace the oil filter, after filling the new filter half full of oil. Replace the drain plug. Put 3 quarts of oil in the oil tank. Replace the dipstick. Start the bike and check for leaks. No leaks, you're done! I use HD Syn 3 synthetic oil in my '04 Fatboy, but you can also use a conventional 20w50, as long as it's made for use in and air cooled motorcycle. Don't use car oil!
The engine "sumped", meaning the oil in the oil tank leaked past the check ball in the oil pump and is now in the bottom of the crankcase. Place a pan under the breather tube and run the bike until no more oil comes from the breather. keep an eye on the level in the oil tank. You don't want to run it dry. If you added oil, chances are the dipstick will fly out due to too much oil pressure. When you're done, either change the oil and filter, or add oil to the tank.
Make sure your oil cap is tight & not cross treaded. If loose, any airpressure will force oil out the bottom, even sitting still without running. Sitting over night with an air leak will force all the oil out of your tank and all over . Something like putting a straw in a glass of water, putting your finger over the end and taking the straw out of the water, the water will stay in the straw untill you take your finger off. To oil your chain, push down on the cap to depress the thin plastic oil tank, when your done oiling, the tank will return to its shape, and draw air in from the bottom or where the oil went out, ready for another oiling.
You didn't give me much information. If it's not from the engine, the only other thing on the bike that has oil in it is either an oil line or the oil tank. Sportsters are notorious for developing a leak on the backside of the oil tank, If you take the battery out and look at the bracket that comes from the oil tank to the battery tray, you may find your leak.
If the oil tank is leaking, purchase a new tank. I saw one guy try to stop the leak by coating the tank with "Creme" fuel tank coating. It did stop the leak but after a while the heat from the oil turned the coating brittle and it chipped off and stopped up his oil pump.
Warm engine up to operating temp. Remove plug in bottom of oil tank. Be ready the oil comes out fast and is difficult to catch. Allow to drip into catch container while you remove oil filter and install new one. Reinstall tank drain plug and fill with oil. Start but do not tach up allow oil pressure to come up. Shut it down and check oil again. Good Luck and Ride Safe O yes do check for leaks
Hi Goulets, if it's leaking from the case seams aside from splitting the cases and resealing them is to check the torque on the case bolts 1/4" bolts/nuts 10 ft lbs. 5/16" bolts/nuts 20 ft lbs. for all other leaks the usual suspects are:
1. Loose parts.
2. Imperfect seal at gaskets, push rod covers, washers ect.
3. Restricted oil return line to oil tank/pan.
4. Restricted breather hose to air cleaner.
5. Restricted oil filter.
6. Oil tank/pan overfilled.
7. Bottom rocker housing gasket installed upside down.
Good luck and have nice day.