I need to replace the metal fuel lines. A quick search here didn't yield anything but sizing and part #s for the rubber bits (already replaced).

The local parts store has 1/4" brake tubing in 25' rolls that I was going to use. Will it work or do I need 3/8" or similar?

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

At first glance I thought that you were replacing the Fuel Injection Hard Lines.

But, after reading 25' of tubing I guess you are replacing the long tubing that runs under the Car.

You want something close to the original inside diameter. I do not think 1/4" is it.

Anoter option is that some Hardware Stores like OSH sell larger ID Aluminum Tubing. Aluminum is OK with Diesel Fuel and I believe Biofuels.

Years ago one of our members was in a hurry and simply bought 25' of Fuel Hose and used Electrical Ties to hold it up under his chassis.

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84 300D, 82 Volvo 244Gl Diesel

5/16" will do. 1/4" is too small.

The ID of the rubber hoses are 5/16" so you want fuel line with and OD of 5/16". I used aluminum when I installed my Veg oil system. The lines worked great. It's easily bendable so you can basically match the original steel lines. For the ends I just made sure my hoses were pushed nearly 2" over the hard lines since there are no ribs or barbs. Never leaked a drop.

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5/16" ID it is.

Thanks, folks!

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

No, your hard lines should be 5/16" OD. The rubber fuel hoses are 5/16" ID.

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OK...as corrected above.

5/16" OD fuel line: # PAC-525 Poly Armour from AutoZone runs $22.99 a roll. Being unsure as to exactly how much I need, I ordered two 25' rolls for continuity's sake.

Advance Auto Parts said it was discontinued. :shrug:

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1974 240D "Boldie" 170K.- New timing chain/freshly rebuilt IP/replaced valve seals/injectors/upgraded stereo/new Bilsteins with Yokohamas/fresh paint and rocker panels plus lots of welds.

I don't know where you are geographically, but I am in San Diego and you can come strip the fuel lines off my w115 240D parts car. Heck if you ply me with a beer and say Ho HO Ho I'll even help you.

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1972 280SE 4.5

I'm dealing with rusted out fuel lines on a 1979 300TD. Are those hard lines 5/16" OD as well?

I used 5/16" ID Hose on the rear Hoses that are under the Tank and the Fuel Inlet Hoses that comes off of the Fender Well.
It should be easy to measure the Tubing where it comes off of the Fender Well

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84 300D, 82 Volvo 244Gl Diesel