Fuel lines.

Well steel braided is that way for strength. The last thing you want is a line breaking and fueling laying on a hot block.... are you sure the plastic wasnt just a coating, with the actual line inside? Doesnt fuel eat plastic over time?

 

To line the pockets of the manufacturer why else? There is a guy on here someplace, maybe it's in LiveTrucking with a Detroit rant that is epic. It's all about how he loves / swears by his Detroit, but all the plastic peripheral parts break that Freightliner uses.

 

I have the hard plastic lines on my 06 Columbia. My understanding is that the advantage over the older style lines is they won't internally swell over time and restrict fuel flow or internally deteriorate. The hard plastic will get hairline cracks with age that are hard to find so they have to be replaced too. I have heard of some guys swearing by replacing them all with standard hydrolic hose. Makes sense to me.

 

I'm pretty sure the reason you never saw as many truck fires back in the day was because the fuel lines were made of metal, not plastic.

Mine has plastic but if I was to replace them, it would be hard line and braided stainless.

 

I could see a benefit with a clear line in certain places. Where I get hoses made uses Parker 201-8 haven't had a problem yet,it seems to stay flexible longer than hoses made at napa,but don't remember part number of the napa hose.

 

I would not use stainless braid. The newer cloth or plastics covered stuff I s just as good for this application in my opinion. That stainless will rub a hole in anything within an inch of it. Including steel frames.

 

I am looking for help on the fuel line fittings my 84 International 9670 has. The mail fitting is cone shaped and when I tighten up the female part of it, coming from the actual fuel line, the whole line turns when I get close to the end. Hope I make sense

 

Need to use line wrench.
How Can a Line Wrench Be Helpful in Auto Repair?