The injectors were not lapped properly by the shop that did the work. The area under the return hoses was bone dry, but I could see fuel flowing from where the two halves meet.

So, the fuel system is self-bleeding and as long as there aren't places for air to leak in, all is well. That is good to know. I used to wonder if I had all of the air out of the system, and if maybe some was trapped and better performance could be had if it was released.

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DON'T MESS WITH MY MERCEDES!


1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles

I used to think that the fuel system was like brakes, where any air that entered in would be trapped forever and cause performance problems. But, now I see that the system is completely self-bleeding, and the purpose of cracking injector lines is just to speed up the process.

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Stop paying for animal enslavement, cruelty, and slaughter. Save your health and the planet. Go vegan! I did 18 years ago. https://challenge22.com/

DON'T MESS WITH MY MERCEDES!


1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles

I used to work around heavy equipment. If something ran out of fuel and the boss wasn't around, we put some fuel in the tank, prime the filter, stuff a gasoline soaked rag in the air cleaner housing and crank away. It'd start right up and sound like it was coming apart for about a minute. Then it quited down and everybody went back to work like nothing happened.

To answer the original Q of the OP: No.

It just means the bolt needs to be tightened down, or, needs a washer. Fuel will leak out, but no air is ingested from that location.

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'06 E320 CDI
'17 Corvette Stingray Vert