Braided lines lasted a year or less once I switched to biodiesel. I got Viton from Fryerpower, should have no more problems. I don't understand why ULSD should attack the braided line material.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Yes, I'm also finding the lines don't last long with biodiesel.

I wonder if that trimmer line would handle BD well. Anyone know what it is made of?

__________________
1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles

Kerry did you use the black ones or the yellow/tan dealer stuff?

I have been having horrible luck with these return lines, my last set lasted a year.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I just ordered 10 feet of 1/8" hard viton from Mcmaster. PArt number 5119K791 . I went with the green stuff just to be weird. I've got three cars on WVO/BD so they all need it. After my wife's car spat 1/4 tank of gas on the highway with newish lines, I'd had enough.

I got the hard (firm) not the soft. Can anyone confirm that is a good / bad idea?

__________________
1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles

The trimmer lines I bought are tygon, which has very poor biodiesel resistance. They might be fine for diesel, but not BD

__________________
1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles