I just had the '95 diesel in for bad glow plug last week and it came back with a fuel smell. I brought it back today and they said a fuel line was cracked. I just replaced them about 2 1/2 years ago. I'm thinking they damaged them doing the glow plug? Or is it possible the fuel lines can crack in 2 years?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

The hard fuel injection lines need to be secured tightly with the plastic/rubber clips or the vibration will crack them, especially if the car has spend a lot of time idling in traffic where vibration is at a peak.

Look the system over and see what you can see. Some of the clips are under the manifold so it may be hard to tell what's going on.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

metal line? or the clear plastic?

either way, they should last way longer than 2 years.

have you confirmed which fuel line is actually leaking?

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1983 300CD Turbodiesel

Without the Clamps the Fuel Injection Hard Lines eventually crack. Even with the Clamps the sometimes will crack.

I have a Volvo Diesel and with all of the Clamps on one of the Fuel Injection Hard Lines developed a pin hole.
I went to a Fuel Injection Shop and one of the guys also had a Volvo Diesel and the very same Fuel Injection Hard Line on his had developed a leak.

The flow and pressure of the Fuel going through the lines erodes the inside of the Lines and they tend to get stiffer over time (work hardened?).

New Fuel Injection Hard Lines can be bent with out too much issue but if you need to bend them only the absolute minimum needed to do the job.

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84 300D, 82 Volvo 244Gl Diesel

So here's the update. The dealer had their 'best guy' on it who works on the older diesels and gassers and I STILL have a fuel leak. This time around the gasket for the fuel filter up front and more fuel coming out the top where the shut off screw is.

It looks like the new fuel lines are installed correctly and they have white plastic clips on them but they are on a black housing and not on the lines themselves.

Is that screw there to be able to cut off fuel supply in case you can't shut it off by the ignition? I am getting pretty frustrated with these guys as I do not have the set up at home to work on these or deal with diesel fuel smell in the garage. How hard can this be to do right?

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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles

Unfortunately the '95 E300 is notorious for fuel system leaks, due to the O-rings. In your place, it may be wise to have all the O-rings replaced, and look hard at the rubber fuel lines to/from the steel lines going to/from the fuel tank. If the injector return lines weren't replaced, have those done as well.

Yes, according to the owner's manual, the valve knob on top of the fuel filter is to cut-off the fuel if the vacuum stop system fails.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

I don't know your 1995, but most cars today use nylon fuel tubing and cracks are common. There are repair kits at auto stores, but amazingly expensive. When replacing fuel tubes in my 1985 300D, I have used Goodyear Barricade hose (NAPA) which is stamped for bio-diesel, which is about the most aggressive fuel on hoses.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

I don't understand this statement. The plastic clips go over the metal fuel lines, holding them tight against a rubber shim that goes between the metal fuel lines and the metal bracket support. It's a sandwich: clip, fuel line, rubber, metal bracket.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC