Stainless Steel Teflon line failure - Ford Powerstroke Diesel Forum
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Old 06-14-2013, 11:17 AM
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Stainless Steel Teflon line failure

I imagine there a bunch of us using the DiscountHydraulics stainless steel ptfe teflon lines all throughout our veg systems. I personally have it everywhere and love the stuff. Well, i was fighting a pressure issue on veg and d2 and since my purge check valve is at the back of the truck, the diesel pressure could be lost through my veg supply line running from tank to FPHE. Found a leak in my stainless line...23k veg miles over a 2 year period.





I have never read of this happening to anyone. I had a low spot where water and mag-choride (winter road de-icer instead of salt or sand) could sit inside the coolant/veg bundle. The stainless outer lining rusted and created a weak point where the soft ptfe inner lining could rupture. The rubber coolant loop lines are wrapped in the same bundle and were fine.

Word to the wise, check your line below the truck if you are using this style line. If you run your hand over the line and it pricks you, those tiny stainless wires are starting to rust through. I replaced the line with the same stuff.
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Old 06-14-2013, 11:53 AM
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Yah there are a number of grades of stainless steel and if yours rusted away it must have been a REAL crappy grade. I help build a buddies veggie fuel system eight years ago but used Swag-Lock fittings, SS braided lines and SS tubing. All his fuel lines look like we put them in yesterday and up here they use a ton of de-icer on the roads in the winter.


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Old 06-14-2013, 01:31 PM
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here is what I use. Just call Dave and order the length you need with the fitting you want. Its laminated and bad ***!

Stainless Steel Powerstroke 99 - 03 7.3 Engine Hose Kit | VeggieGarage.com
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Old 06-21-2013, 05:38 AM
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interesting. I have this same hose almost 5 years under the truck and no leaks yet. I dont have all the nasty road chemicals here in TX. Ill have to pay attention to my hose next time I am under the truck.
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Old 06-21-2013, 06:08 AM
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The sheathing looks chafed ?
are you sure it wasn't a rubbing issue?
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Old 06-22-2013, 10:30 AM
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It could have only rubbed on rubber as it was bundled with (2) 5/8" coolant hoses and sheathed with pipe insulation. Then (my problem) was I put a protection rubber materical around it that let water in then held it until it evaporated. I'm thinking the chemicals and constant water ate through the cheap(er) stainless grade covering.

It looks good everywhere where is wasn't sitting in water/chemicals. This same stuff goes to both back fuel ports with no outer protection.

I really do like the coated stuff that veggin' suggested. That stuff looks bomb proof.
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