I recently ran out of fuel and then ran into a few other problems along the way.

I am getting air into the system from somewhere.

After running out of fuel I have replaced the following:

Secondary fuel filter, primary fuel filter, fuel line to and from primary filter, primer pump, tecalan line from primer pump area to secondary filter(with 5/16 rubber fuel line).

I have bled this thing till it won't bleed any more but I still have rough running conditions.

It is 27F right now and it wouldn't start at all. I put the charger on it, used the 50A engine start selection on charger and it still wouldn't start.

I get an idea to pump the primer pump a dozen or so times and VOILA, she starts.

What gives?

With all my mucking around in there I have noticed that I managed to cause one of the rubber fuel lines on the rear injector to spring a minor leak but other than that I can't detect any leaks.

What would be the problem if I can start the engine after a few pumps on the primer pump but it won't start otherwise?

It also runs pretty poorly right now in general and it got this bad after I ran out of fuel. I will say that it is basically a worse version of how it was running before so I may have just magnified an existing problem somehow.

At stop lights it will lug badly if I leave it in gear with the brakes on and will also run pretty badly when I put it in neutral.

It does this warm and cold.

I will replace the tank screen as soon as it warms up a bit. Could that cause this problem?

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1993 W124 300D
-297K on the clock as I type this.