My inj. return lines were cracking, so I got some translucent fuel line from the mower place, to see how tight the whole thing was. Well, I there are a lot of air bubbles in the return lines. The material is harder than normal, maybe not a good seal? The fuel filter has only a very small bubble in it. The vehicle runs well, are these bubbles a problem? There is quite a bit of air, even after running hard for a while.

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1981 300D 205,000 mi.