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Home >> Ford >> 1990 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Test Aa - No Start (EDIS Ignition Only) >> Test Aa: Step 10
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Test Aa: Step 10

10) Fuel Pump Check  Connect pressure gauge to vehicle. Note initial pressure reading. Pressurize fuel system by turning key on for one second and observe pressure gauge. Turn key off, and wait 10 seconds. Repeat sequence 5 times. If pressure increased, go to TEST S, step 1). If pressure did not increase, check fuel pump and system for mechanical problems.