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  #1  
Old November 27th, 2005, 10:57 PM
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steve
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Biodiesel

For those of you that have run biodiesel on the 300tdi have you had any problems with the fuel lines or seals?

I have read the rest of the fourm on this but never a sure answer.

I have read that all pre 95' engines have to have the seals and fuel lines replaced but is that a stead fast rule? My 300tdi was sourced used from the UK so I'm not 100% sure on the year, although they introduced them in 94' so....

I'm going to give it a shot this week and wanted to make sure I wasn't opening a can-o-worms (like everything else I try!).

Thanks All
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  #2  
Old November 27th, 2005, 11:31 PM
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I'm not a very good example because my engine was manufactured in 2002 and I've used all aftermarket braided stainless teflon-cored fuel lines.

There is absolutely no hard-and-fast rule about when rubber/synthetic lines would or would not have been used.

The the OEM parts I bought and didnt use during my conversion were definitely not rubber.

I cant think of any places in the motor itself where rubber could be found/problematic. The only problems I've ever heard of were related to bio dissolving varnish and sludge in the fuel tank and accelerating the decay of old hoses.

The bio eats paint though, its taking the finish off of my underseat fuel tank. I dont care, and the area is so diesely that its not going to rust, but its a noticeable effect.

I dont think you'll have any problems but YMMV!
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Old November 28th, 2005, 03:19 PM
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I'm jealous, very jealous. :D
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  #4  
Old November 28th, 2005, 04:14 PM
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What we need is more diesel porn!!
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  #5  
Old November 28th, 2005, 04:26 PM
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agreed!!!

Follow-up Post:

Speaking of Diesel Porn, This is my all-time favorite diesel engine.

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Old November 28th, 2005, 04:51 PM
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I've got a whole hard-drive full of diesel porn I'll post up when I get home.
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Old November 28th, 2005, 07:54 PM
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Ohhh ya! that's a beauty.

Follow-up Post:

Hey Jim... Where did you get your fuel lines anyway?
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Old November 28th, 2005, 10:34 PM
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Quote:
Originally Posted by JimC
I've got a whole hard-drive full of diesel porn I'll post up when I get home.
ha ha, I can't wait to see it Jim!! Sounds good
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  #9  
Old November 28th, 2005, 11:55 PM
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Here is some Diesel pr0n. Ooh la la.

I got the fuel lines from Swagelok, they are pharmaceutical grade. This setup would be a lot cheaper with only one tank because its the flex lines that cost the most and I had to use a lot to routing to and from my switchover valves.

A basic set up would have 2 12" lines going in and out of the tank, hard lines in between, and a couple 24 or 36" lines from the hardlines to the lift pump/fuel return. That setup would only require 8 fittings as well.

One advantage of my setup is that each piece can be replaced individually instead of needing a whole new set of lines or having to patch with flexi fuel hose. Another advantage is the stainless and teflon - the fuel lines are damn near indestructible.

I bent the stainless hardlines up myself using 5/16" stock. The Swagelog fittings allow you to connect tubes to the flexlines.

Let me know if you more info.

Follow-up Post:

this sux, my computer with photoshop got stolen and now I cant resize pictures or edit them very well and the forum only allows you to upload 640x480 pix. You're all stuck with that until I can get to my storage area in Washinton and find my discs! Dammit!
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  #10  
Old November 29th, 2005, 10:23 AM
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Sure is a beaut' Jim! Lookin' good
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  #11  
Old November 29th, 2005, 10:25 AM
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Hey Jim for a quick fix to resize you pics

http://www.showyourphotos.com/
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  #12  
Old July 24th, 2006, 10:13 PM
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Jim, could you give me more info on teh swageloks? In the rebuild right now, there's no reason for me to swap in a diesel yet, but I do want to get as much ready as possible for the future. The V8 that I have has less than 80,000 mi. on it right now and I just don't have the money to swap that out with the rest of the rebuild (the truck was totalled, so that parts have added up already). I want all the fuel lines to be high grade diesel compatible though and I want to replace them while I have easy access right now.

Specifically, where did you get the hard lines from, does swagelok sell those too? Then did you just use a tubing bender similar to brake lines? Do you have a ballpark of what the fuel lines ran you? I want to do it right, and I think the swageloks are the way to go.
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Old July 24th, 2006, 11:21 PM
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Swagelok has dealers around the country, but you could call Rod Busbee in Columbia SC and he could supply you the needed parts. I used some electropolished stainless line that Rod had in stock (5/16" i think) and bent the lines myself. I used a tubing bender he lent me (thats what the black marks are on the lines for).

Each fitting is around 10 bucks, and I used a lot of them because I have 2 tanks and switching valves. With a one-tank set-up you would need 4 flex lines and 8 fittings, which would be around 250 bucks (depending on where you put your fuel filter). Each piece can be disassembled and replaced separately when finished, so no more flex hose crimped onto hard lines run under the body (hell to replace). If you do decide to get the swagelok stuff, let me know and I'll give you more detailed sizes and tips. You can also get hear sleeving from them for the flex lines in the engine compartment.
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Old July 25th, 2006, 07:15 PM
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Thanks for the info Jim. I would be very interested in the specifics of some of those fuel lines if you have them. I like the idea of replacing the different sections separately too, that's perfect! I checked online and there's a swagelok dealer pretty close, I'll have to stop by there. Thanks.
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Old July 25th, 2006, 08:23 PM
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Here are some part numbers-
12" flex hoses - SS-4BHT-12 (The last digit of the number is the hose length in inches, so you can have 24's, 36's etc. I would suggest two twelves for back by the tank and a two 24's for up front.)
Connector - SS-400-6 (This is the connector for the flex hoses to the hardlines - you will need 4)
Adapter connector - SS-8MO-6-4 (the tubes coming out of the fuel pump are 8mm, so you have to adapt them to the tubing size. Like wise the fuel pipes on the motor are probably also 8mm as they were on my TDI, but that should be checked. Again, you need 4.)

Please verify all the part numbers with the Swagelok guys, my invoice isnt really specific and my memory has faded. The standard fuel hose clips will hold the stainless piping fine.

So your shopping list looks like this:
4 Adapters
4 Connectors
2 12" hoses
2 24" hoses
some stainless pipe

Be nice to the Swagelok people and they might lend you the tube bender and a reamer for cleaning out the end of cut pipe. Be sure to ask them how to use the tube bender also, the Swagelok tool is many times better than the standard crap from Autozone - you can put bends exactly where you want them.

If you are into mechanical stuff the Swagelok place will probably make you horny. They do amazing work with orbital welders and other exotic equipment. The quality of the parts themselves are incredible - they are used in nuclear power plants.
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  #16  
Old July 25th, 2006, 09:12 PM
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We use a lot of Swagelock pieces on the robots we use to paint the inlet ducts on the F-22 fighter - very nice stuff - highly recommend it. Georgia Valve and Fitting is the Atlanta area dealer.
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  #17  
Old July 25th, 2006, 09:24 PM
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Jim, what a help you are. I really appreciate it, that's plenty to get me started, that's for sure.

This should maybe go in another thread, but has swagelok come up for power steering hoses and high pressure oil lines and do they make something that would work in that case?
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Old July 25th, 2006, 09:38 PM
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I dont think it has come up - but I can tell you from experience though that they are not good for AC lines on a diesel - the fittings are too heavy on the 1/2" (1/2" fittings are large!) lines and vibration cracked the pipes coming out of the compressor. So think through your application thoroughly first. Fuel lines are small, have little mass, and vibrate less. I thought I was clever and ended up making a more failure-prone setup on the AC. Its worth experimenting, but dont F up!
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  #19  
Old July 27th, 2006, 10:53 PM
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Do you remember how thick the walls were on the stainless tubing?
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  #20  
Old July 27th, 2006, 11:55 PM
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exactly no, but its a lot heavier than stock.
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