Biodiesel fuel lines that need to be replaced - PeachParts Mercedes-Benz Forum

NC Benz · #1 06-07-2007, 12:26 PM

I have searched the site for a listing, or better yet pictures of all the rubber fuels lines that should be replaced. Has anyone made such a listing?

Biodiesel300TD · #2 06-07-2007, 12:52 PM

For a 123 chassis you will eventually need to replace these lines:

1. Supply line at the tank.
2. Return line at the tank.
3. Line from the steel supply line to the primary filter
4. Line from the primary filter to the injection pump (actually the lift pump)
5. The injector return lines.
6. Cigar hose from the secondary fuel filter to the retun steel line.
7. The tank vent lines also need to be changed on some occations.

5/16" hose will work for all the line but the injector return lines, you'll need 1/8" for that.

You can get solid viton hose, hose with a viton core, or many people have luck with using the fuel hose you get from Mercedes.

On the new models you may have to replace the delivery valve seals, and some of the o-rings where the steel fuel lines screw together.

Grease Works has viton hose kits, you can also get bulk viton, or bulk viton lined hoses which are much cheaper. Don't use the worm gear clamps they will cut into the hose and you'll have to replace the hose much quicker. You should use band style clamps or reuse the stock MB clamps.

airbus · #3 06-07-2007, 01:18 PM

Fuel Filler Neck Seal

vstech · #4 06-07-2007, 01:39 PM

gas cap gasket

slarson80 · #5 06-07-2007, 01:45 PM

http://dieselgiant.com/mercedesfuelhoseinstall.htm

Bill Ladd · #6 06-07-2007, 01:51 PM

Quote:

Originally Posted by airbus

Fuel Filler Neck Seal

Amen on that. Just got mine in yesterday.

Biodiesel300TD · #7 06-07-2007, 11:03 PM

The fuel filler neck seal usually only goes bad if you spill biodiesel. If you clean up after a spill it usually will be okay, but it's defintely something to keep an eye one. If it does go bad it will start leaking into the trunk. The wagons actually have two filler neck seals. The neck goes through the body into the area where the first aid kit, and jack are, and then through the body again to go under the car to the tank.

riethoven · #8 06-07-2007, 11:12 PM

Quote:

Originally Posted by Biodiesel300TD

The fuel filler neck seal usually only goes bad if you spill biodiesel. If you clean up after a spill it usually will be okay, but it's defintely something to keep an eye one. If it does go bad it will start leaking into the trunk. The wagons actually have two filler neck seals. The neck goes through the body into the area where the first aid kit, and jack are, and then through the body again to go under the car to the tank.

I replaced all the lines on my wife's wagon and the supply line frome the tank to the hard line only had a hose clamp at the tank, unlike the photo that shows a crimped hose at the tank.

dwoloz · #9 06-08-2007, 12:28 AM

The DieselGiant pictorial is quite good

I got Viton injector lines here http://www.fryerpower.com/store/page11.html

HowellK · #10 06-08-2007, 11:44 AM

I did find 5/16 hose at **************.com
They are selling it by the foot; supposed to be for biodiesel and it's tougher than the viton- not the problems with hose clamps.

nscarr · #11 06-21-2007, 06:05 PM

i just changed the fuel lines using the **************.com tubing kit--overall very nice and with good instructions for a noob like me.

Old300D · #12 06-21-2007, 08:00 PM

Quote:

Originally Posted by Biodiesel300TD

The fuel filler neck seal usually only goes bad if you spill biodiesel. If you clean up after a spill it usually will be okay, but it's defintely something to keep an eye one. If it does go bad it will start leaking into the trunk. The wagons actually have two filler neck seals. The neck goes through the body into the area where the first aid kit, and jack are, and then through the body again to go under the car to the tank.

And it cannot tolerate biodiesel AT ALL. I replaced mine with a new one, and a month later, maybe 3 tanks, it has a hole melted in it. And I'm quite careful about filling. I would just give up on this one.

Bill Ladd · #13 06-21-2007, 09:31 PM

Quote:

Originally Posted by Old300D

And it cannot tolerate biodiesel AT ALL.

Oh crap.

PerkHouse · #14 06-22-2007, 12:13 AM

So, what's the problem with Buna-N (Nitrile)? It seems to hold up just fine with VO. (I've been using it over a year in my filtering, dewatering, and fuel supply with no hint of softening, cracking, or any other deterioration.) Has anyone tried it with biodiesel? If it truly is a problem, it must be the alcohol that's the problem.