More on Viton:
http://www.greaseworks.org/viton and there's this report on viton comaptibility.

diesel specials
 

Call Phil at partshop try changing the fuel filters, possibly change the strainer at the bottom of the fuel tank add lubrimoly diesel purge which cleans the system and also diesel high test all available at partsshop call phil 888 333-4642 check out the specials this month at the top of the forum page

Thanks for the pointers!
;)

http://www.peachparts.com/shopforum/McMaster-Carr has Vitron tubbing for about half the price listed at the site RLeo listed and they will sell it in 1 foot lengths if that's what you need. :D I use them all the time.

What about WVO? does WVO cause the stock fuel hoses to deteriorate? Or is it just a problem with the Biodiesel stuff?

Is it specifically the methanol in BD that is the cause of the problem?

That link isn't working, is there a typo? If I go biodiesel I need to get that stuff too.

Apparently it is the methanol that causes the problem. Additional anecdotal info from the guys at Austinbiofuels says that the deterioration only occurs when using biodiesel in concentrations greater than B20.

Associated info
here. This report focuses mainly on leaking seals in the IP and, is pretty generic in scope.

Let's try again. McMaster-Carr

Another source of fuel line that is safe with bio fuel is at your local hobby shop and is used for fuel lines on model airplane engines running nitro fuels. The problem is you will generally pay more for the fuel line from them.

Methanol explains a lot. My filter just didn't look like yours and I was getting the same problems. My main filter was clogging I think but I was not getting and rubber junk in the pre-filter.

Still a glogging problem but a different cause.

I think I was getting lots of silt and crap from the used motor oil that was getting past my 5 micron bag filters and the tank & in-line filters.

I may start trying 1 micron bag filters in my WVO process.

Do tell.....what did you pick up????

And my wife complains about my 3 cars truck and harley......I don't have one single parts car........... :(

Hmmm
 

The OEM hoses where made to handle dino diesel only.
WVO is biofuel and will eat rubber hoses...


http://www.mcmaster.com/

Viton hose is what you need...

SWMBO's ex did nothing but smoke pot, and boink other women.

My Mercedes addiciton is nothing in comparison to that crime...in addition, none of our vehicles have been filled with dino diesel since the stuff was $1.89/gallon, I've remodeled my house, built decks all over the place and landscaped the yard to "bank" the brownie points/attaboys that I readily swap for the ability to bring dead parts cars home and stockpile 150+ gallons of used restaurant oil in the garage. :D

Right on the Viton, wrong on the WVO. Nothing in there that can attack rubber...it's the biodiesel causing it. The same thing happened when people started using Gasohol in cars.

If you are using commercially produced biodiesel there should be no methanol in it whatsoever. The mehtanol and other residuals of the reaction are either recovered or washed out. The only way you would find residual mehtanol is if you were using unwashed homebrew. The methanol will dry out rubber and cause it to crack more often than melting it.

Biodiesel will melt, over time, natural rubber, but then again so will oil, any oil, whether Veggie or Petro. Oil and rubber don't mix so well, which is why they always caution you about spilling oil on your rubber belts.

The other issue at hand is the fact that Marlene is a 20 year old car. All be it a Mercedes. It is time to replace those old hoses regardless. I have been running well washed and well made homebrew (it's my full time take all my profit job) for several years now in my '83 and the only problems I have had besides the usual tank degunking period (which by the way required 4 prefilter changes and 1 main filter change over the course of a year) were the braided fuel lines going to the expansion tank behind the spare wheel. After calling my friend down at the Mercedes shop I was informed that Mercedes still use rubber fuel lines, so I replaced these with standard fuel line available from the local parts store. No problems. Hell if these last 10 years instead of 20, no big deal. The only other hoses I have replaced were the litte pieces going to and from the prefilter as I was always getting BD all over the hoses every time I had to change it out.

The biggest mess so far from the years of B100 use is the breather tube around the filler neck. These melt and turn to goo (and I mean goo!) in every biodesel I have seen so it is worth ordering two (by the way I order the prefilters by the box and keep them and a 4in1 under the seat).

How did they determine it was rubber? I can still get black grit in my prefilter even after all this time when I am foolish and start to run out of fuel (I need to fix the fuel guage!) but more often when I am on the road and have to mix in Petro diesel and do the same thing.

What you can do is replace the lines now with stock tubing and order the viton to have on hand when and if these deteriorate.