The less than 2 years old 1/8 injector return lines from NAPA got soft after 1/2 tank of biodiesel and one of them developed a bad leak spewing precious fuel. I know SAE J30 R9 is bio compatible but they do not come in 1/8" i.d. afaik. Please post what and where I can buy some. It is too cumbersome to search on this phone and I won't be near a puter for a few days. TIA.

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85 300D turbo pristine w 157k
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parts for sale- pm me your needs.

Just get the OEM brand they should hold up fine. IIRC return lines are a yearly maintenance item per FSM

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1987 300D Sturmmachine
1991 300D Nearly Perfect
2000 VW eurovan FOR SALE
1985 300D car, sold and missed.
OBK #42

Call Phil for help at1-888-333-4642Mon-Fri 9:00a-6:00p ETHe has the lines in stock either pre cut or in 5 meter rolls...

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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"

Current
Monika '74 450 SL - 207K mi
FoxyCleopatra '99 Chevy Suburban 199K mi
Annika 2006 Volvo S80 2.5T AWD 93K mi
Krystal 2004 Volvo S60 116K mi
Gone
'74 Jeep CJ5 23000 original mi
'97 Jeep ZJ Laredo 390K mi
Rudolf ‘86 300SDL -360K
Bruno '81 300SD -260K
Fritzi '84 BMW 283K
'92 Subaru 283K mi
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad

Here is an online seller for the viton return hose

link

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My infants:
1984 W126 300SD - 118000K WVO conversion
1979 W116 300SD - 160000K Registerd Classic Vehicle

Another link:

Fryerpower. I just bought some of their viton line for my diesels. The factory stuff lasts less than a year before biodiesel begins oozing right through the material.

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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) 201,000 miles My car
1996 E300D (W210) 289,000 miles Wife's car

"Politicians are the same all over the world;
we build bridges where there aren't any rivers."
-- Nikita S. Khrushchev

lol vacuume hose ftw!

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.

McMaster-Carr sells 1/8" Viton hose. That's where I got mine.

Alternatively Ace Hardware sells a peach colored 1/8" synthetic fuel line intended for weedeaters and chainsaws. It holds up to biodiesel just fine but looses its shape when heated. You'll develop a leak in no time unless you find some sort of small hose clamps.

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Vehicles:
1983 300D - Mostly stock, but not for long!
1981 El Camino 'OILBRNR' - 6.2L Diesel conversion - Blown motor? Probably parting-out.
OM617 powered '86 F150 - Gone, and good riddance!
Yay biodiesel (when you can find it)! Otherwise yay WVO!

How long have you run biodiesel with the OEM return lines?

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85 300D turbo pristine w 157k
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parts for sale- pm me your needs.

What kind of lines are these (**************)? They don't say. They are expensive though!

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85 300D turbo pristine w 157k
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parts for sale- pm me your needs.

Just talked to NAPA. The hose that leaked is 1/8 i.d. 1/4 o.d., has a Nitrile inner core and Hypalon outer sheath. It is SAE 30 R6 & R7, rated for gasahol and diesel. 50 psi. I cut the hose in half lengthwise to have a better look. The inner core seems to be intact for the most part but there was a small puncture. The outer hypalon sheath has turned soft like cheese.
SAE 30 R9 has a Viton core, unfortunately the smallest i.d. available is 1/4

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85 300D turbo pristine w 157k
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parts for sale- pm me your needs.

Try the truck air brake line 1/4" . Cut to the right length with a safty razor blade then just warm the ends up in hot water and shove them on.

Try the truck air brake line 1/4" . Cut to the right length with a safty razor blade then just warm the ends up in hot water and shove them on.

Interesting! I must admit I do not know anything about truck air brake lines. What material are they made of? Are they 1/4" o.d. and 1/8" i.d.? And have you actually used it in your benze as return lines for biodiesel? How long have they been in and how are they holding up?

__________________
85 300D turbo pristine w 157k
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parts for sale- pm me your needs.

Not sure of the exact material, possibly a high density polyethylene/nylon. I used it on a 240D that my wife had and on my 2.4L TD Lincoln MKVII. The id of the line is .160
Don't know how there are holding on the 240, sold it a few years ago but the Lincoln is going on 4 years now.

And you have been running biodiesel on these truck air brake lines as injector return lines for 4 years without problems?

I ordered 4 ft of the Viton lines from Fryerpower for $17 for now. How much are the truck air brake lines? Are they straight or coiled? Do you have a link? Thanks!

__________________
85 300D turbo pristine w 157k
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parts for sale- pm me your needs.