If the engine cranks but does not start, it may be caused by a tripped inertia switch. Switch the key to "ON" and the fuel pump should be heard running for a second or two. Listen at the gas filler if necessary. The inertia switch is located on the firewall and can be tripped when the parking brake is set too hard and then released. The inertia switch should be reset, and will click when it is reset.Google+
Car Problem Reports
Mazda B4000 Crank but No Start Condition
Mazda B4000 Problem
Average Mileage: 139,000 mi (54,000 mi - 208,000 mi)
Visitor, 1994 Mazda B4000, 54,000 mi
Fuel pump inertia switch trips often. Will not re-set. Reset Button stays "mashed".