Tank screen is almost certainly plugged. Warm weather climates are the best (ha) place for bacterial growth in the tank, only marine applications are worse.

You will need to pull the fuel sender out of the top of the tank, accessable after you remove the first aid tray on the W123 chassis.

Also check for a leaking suction line from the tank to the lift pump -- the rubber under the fabric cover can go bad, and all that gets sucked up is air, not fuel!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!