I just obtained a Haynes manual, and noticed two types of glow plugs. I just pulled the glow plugs out of 220D and found both types. Is this normal to use both? Or should I use just one kind?
Fuel Lines. In my haste to get 220D started after setting for several years, I R&R fuel lines with aftermarket lines from store. Should I buy fuel lines from MB or will the aftermarket do? Still can't get the 220D to start. Seems like when I hand pump air in lines move alittle but still stays in one spot. Any suggestions on removing the air. I've tried the Inj. pump itself I'll pump and open port and air returns from injector. Does this mean that there is still a leak somewhere in system?

Thanks

Does your MB have the automatic glow plug controller or are they the manually operated glow plugs? Are these the 2 types you are talking about. The manual glow plugs (old style) are 1.5 volts and must be connected in series along with other resistors so they can be operated on 12 volts. The auto controlled glow plugs (new style)are 12 volt and are connected in parallel. Therefore the 12 volt plugs have a much higher resistance and if one or more are in series with with the old glow plugs, they probably will not get hot enough to start the engine. If an old style glow plug is connected to 12 volts (parellel connection), it will burn out like a 12 volt bulb connected to 120 volts.
You can tell which are which by looking at them. The old style (series) have a loop on the end and the new style (parallel) have a single shaft on the business end. Also the old style have a double connection and the new style have a single connection. On the new style the return current goes thru the cylinder head (ground). On the old style, the current goes from one glow plug to the next with only the last plug grounded to the head.
P E H

73 220D was converted. It does not have the squiggly wires between glow plugs. It has a single wire that comes out of the harness and then connects to a glow plug. From there it is connected to the other glowplug, by a single wire. So on until the first glow plug.

I converted a 190D to the new glow plugs. It worked great. You should install a short piece if copper wire in the glow plug indicator in the dash board to eliminate the resistance of the glow indicater wire. This will allow the glow plugs to get hotter.
All the glow plugs should be the new style.
You can take the glow plugs out of the engine
to see if they are getting hot enough: they should all glow red hot. Each one must be grounded to the engine properly to do this test.
P E H