I replaced the primary and secondary fuel filters in my 300TD two weeks ago. It had a Mercedes secondary on it and I put a Hengst I had on hand. The Hengst is a bit bigger than the OEM filter. Drove the car for a bit in town and all seemed fine. Could feel a little wetness when running my hand under the filter, but assumed it was leftover from the bleeding. A couple of days I go, I drove to the cottage (over an hour of highway). On the way back, 15 minutes from home, I noticed the fuel tank was half empty (I had filled it up on the way to the cottage). Pulled over, popped the hood, and there was diesel fuel everywhere on the left side of the engine, it was dripping on the ground. Shut off the engine, took out some tools, checked for tight fittings and hose clamps, snugged one up. Decided to drive to the next exit and check it out again. On stopping, I noticed a trail of diesel behind the car, puddle under the engine, rear hatch and window covered with oily film. Even though I was only 10 minutes from home, I figured it was safer to call CAA and get it towed.

Went out and got a MB filter from the dealer, put it on, and leak went away instantly.

Inspected the Hengst and looks like it was banged up in shipping because the bottom was dented and I could see the crack from which the fuel was pouring out under pressure.

Lessons learned: always carefully inspect filter before putting on (for dents or cracks); don't dismiss any slight surface leak; and: I will stick with OEM Mercedes filters from now!

One thing I am thankful for is that I drive a diesel. With a gas engine, my MB would likely be a charred write-off by now (and who knows about me and my passenger and my dog). One great advantage to us driving a diesel car!!!!

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1983 300TD 240K - 1982 240D 215K - 1996 Dodge Cummins 70K