Hi Gary, I'll bet you get a lot of good replies to this tube problem, so I'm probably redundant but adding my 2 cents anyway. It could be that the plastic tubing has softened or has been affected by the oil over a period of time, causing a once-tight connection to fail. My suggestion would be to go shopping on the Mc Master Carr website (I'm just a happy repeat customer) and find a hard (durometer) tube compatible with the oil. Also review the different brass tube fittings for plastic tubing. Some have support sleeves that go into the tube ID. If you can't change your fittings, try to support the tube ID with some thin-wall metal tube appropriately sized (brass or stainless in the MCC on-line catalog). Also, check out environmental-friendly lube oils such as the ones made by Clarion Lubricants www.clarionlubricants.com (I have no relationship with this one either.) I suspect we recreational boaters soon will be subject to oil regs, trading our Boeshield T-9 for salad oil spray. Cheers, Rich Losch OCEAN LIBERTY KKY 52-01 Wintering in Oregon --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus