The fuel pump relay may fail resulting in a "no start" condition, the engine will crank over but will not start and run. Checking for proper fuel pressure would be the first step in diagnosing this concern.
Car problem reports
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Most reported 1991 Volvo 780 problems
Engine stalling/stumbling problems can be caused by a failing mass airflow sensor.
Transmission oil leakage from the rear output seal is common, caused by a worn output shaft bushing. Our technicians tell us both parts should be replaced to correct this concern.
When braking, a loose feeling from the front end can be caused by worn strut rod bushings. Worn bushings will require replacement. After they are replaced the wheel alignment should be checked.