thank you for your calm reason.

The fuel warmer is bad and may have been bead for many years. I should have removed it and inspected it years ago.

Have new o-rings for all of the system and filters including the tank strainer screen and new fuel warmer arriving tomorrow.

Cheers

update on the 606 blues

now I have replaced all of the o rings on the fuel lines, new pre filter and main filter and the fuel heat exchanger. when I attached the main fuel line to the heat exchanger fuel began to fill the hose running to the pre-filter untill there was no bubble at all. This is the first time that I can remember no buble in that line, so I had hope. but now after a few hours more tinkering with filling the tank to the absolute top and the filter and vacuuming out the bubbles and cranking no start. The last time that I tried cranking the line leading to the pre filter began to develop a bubble that got larger as it was cranking and now the dreaded bubble is back.

The only o ring that I missed was the one behind the fuel shut off valve. Mercedes said that there is none in the country and it will have to come from Germany. Pelican Parts has many and it will be here in 3 days.

I still do not see any signs of fuel and the line at cylinder 1.

The only sign of leakage is under the IP's governor.

May Day! 2 weeks untill this car needs to leave town for a 2 month job.

You might want to start a new thread for your issue. Copy all the post, about your problem, from this thread to the new one. Title the tread to attract the type of help you need. There must be someone in Austin who can look at your problem with a fresh pair of eyes. I live near I-35, just 1360+ miles north of you.