99' E300TD just looses power and dies. When it first happened I saw air in fuel lines -looked like engine was starved for fuel.

Rebuilt fuel pump, changed fuel lines, changed all the o-rings, cleaned tank and changed tank filter. Nothing is leaking. Ran for a while beautifully, then died again. Could it be a sensor - diagnostics shows all OK.

Any ideas?

 

What about the fuel filter near the engine? If you changed the fuel lines, from what I've been told, you're going need to crank it a lot to get the fuel back to the engine. Battery charger would reallybe handy.

 

Make sure the air intake passage is clear... not stopped up with a rag, etc. Open the breather and also check the air filter... Make sure it hasn't sucked in any water. While you're there, spray WD 40 into the breather... NEVER USE EITHER. IT COULD RUIN YOUR ENGINE!

Now crank it up!

If that doesn't work, I guess I can assume, as AMGMercedes alluded to, that the first thing you did was to replace the fuel filter next to the engine, then loosened the fuel line from the fuel fiter, cranked the engine untill the fuel pumping out no longer contained bubbles.... which of course indicates there is no air in the lines....
If so, then the next thing you might try is loosening the fuel lines, one by one,on top of each injector. Crank the engine until you once again see bubble free fuel, and move on to the next injector, etc... After that's done, you'll know your engine is getting the proper airless fuel...

However, if you haven't replaced that fuel filter, that may have been the problem all along..