1981 300D non-turbo

The way I start the car is to press the gas pedal to the floor. I get grey smoke from this.

So I've replaced the pre and spin on filter and hand pump. I am waiting on diesel purge.

My current fix has been to turn up the idle at the dash and start the car as described. When I try to bleed the injector lines @ the injector I see a foamy discharge, which causes me some worry.

The idle problem exists at any temp , not just start up, and the hard starting seems elliviated some bit if the car has been sitting for a very short time say 30 mins.

I am really interested in opinions of the foamy fuel at the injector lines, seems
bad but I'm not sure.