My power lock quit. Gotta unlock all of them manually now. All the MB guys around here tell me they are vacume but i cannot find any vacume lines in the doors at all. All i see is 3 wires going to the lock solinoid. No vacume lines. It is an 81 126 body. Any ideas???

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2003 Ford Crew Cab 6.0 Powerstroke Diesel 6 spd 4x4(For Sale)

1981 MB 300SD 190,000 miles Gray with cream interior.(sold)
1981 MB 300SD 239,000 miles Cream with Brown interior.(sold)

Driver's door may not have any vacuum lines on the 81 model, but other doors will - they are yellow hard plastic. Maybe the pump is bad. It's in a football shaped foam case in the spare tire well.