Hawkeye
Veteran Member
I've been chasing a couple of diesel leaks since topping up in late Sept. Finally, I removed all the paneling around the six 110 gal tanks and got to the bottom of the problem. One leak is in a microscopic weld "failure" at the bottom of a tank, at a ball valve connection. The second leak is tiny, through threads of a nipple connection at the bottom of another ball valve fitting. These two leaks (and I hope no more) came immediately after adding 200 gallons of this stuff, on top of 400 gals of conventional fuel already in the tanks so it is pretty well diluted. My tanks are 18 years old, 5052 aluminum built by a reputable company.
I blame this product, whose technical data I finally got from their Houston office. (Sorry, not a hot link.)
https://www.neste.com/sites/default/files/attachments/neste_renewable_diesel_handbook.pdf
Two relevant points for me are made in this document, 1) that this fuel is less dense than conventional diesel and 2) that the plant-based fuel is known to "cause leaks" in fuel systems more than 10 years old (perhaps because it is less viscous? I'll leave it to the fuel chemists and other experts on TF to make any connection between the two.) Note than this fuel is not conventional bio-diesel. It is from combustible waste, including food waste and it is said to have a chemical make up identical to #2 diesel.
At this time this fuel is only sold in California. Is it coming to the rest of the country? Because it is slightly cheaper (.05 gal) and has environmental benefits compared to good old #2 I believe that it will soon be sold far more widely than just California.
My fuel supplier for many years, Pittsburg Marina (a city-owned outlet in the Ca Delta area,) changed to this stuff a few months ago without telling their customers of the change. Had I known, I would have avoided it and willingly paid the $.05 additional until the stuff proved itself in key applications (like 10+ year old boats.) Now, I worry not only about the fixes for the two leaks I've located but the potential that new leaks keep appearing.
So, a heads up to all.
I blame this product, whose technical data I finally got from their Houston office. (Sorry, not a hot link.)
https://www.neste.com/sites/default/files/attachments/neste_renewable_diesel_handbook.pdf
Two relevant points for me are made in this document, 1) that this fuel is less dense than conventional diesel and 2) that the plant-based fuel is known to "cause leaks" in fuel systems more than 10 years old (perhaps because it is less viscous? I'll leave it to the fuel chemists and other experts on TF to make any connection between the two.) Note than this fuel is not conventional bio-diesel. It is from combustible waste, including food waste and it is said to have a chemical make up identical to #2 diesel.
At this time this fuel is only sold in California. Is it coming to the rest of the country? Because it is slightly cheaper (.05 gal) and has environmental benefits compared to good old #2 I believe that it will soon be sold far more widely than just California.
My fuel supplier for many years, Pittsburg Marina (a city-owned outlet in the Ca Delta area,) changed to this stuff a few months ago without telling their customers of the change. Had I known, I would have avoided it and willingly paid the $.05 additional until the stuff proved itself in key applications (like 10+ year old boats.) Now, I worry not only about the fixes for the two leaks I've located but the potential that new leaks keep appearing.
So, a heads up to all.