1995 E300 pressure in fuel tank
More likely a vacuum situation, rather than pressure, caused by the blocked tank vent line or valve mentioned by alex300SD. As the fuel is withdrawn from the tank, a partial vacuum is created since the venting system cannot equalize the tank to outside atmosphere, making the pumps work harder and eventually stalling the car. You've bypassed the clogged venting system by leaving the fuel cap open.
Regards,
Tom
'95 E300D
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