Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1987ECONOLINE E250, VAN DISPLAY, 5.0 NREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISFUEL PUMP - ELECTRICTESTINGHIGH PRESSURE FUEL PUMPMPFI MODELS
1987 Ford Econoline E250, Van Display, 5.0 N
MPFI Models
1987 Ford Econoline E250, Van Display, 5.0 NSECTION MPFI Models
- Check fuel tank(s) for adequate fuel supply. Check for fuel leaks at fittings and lines. Locate electrical connector on frame-mounted fuel pump. With ignition off, disconnect fuel pump connector from harness and connect ohmmeter across body connector.
- If continuity is 5 ohms or less, go to step 4. If continuity is more than 5 ohms, check for continuity between connector ground lead and ground. If no continuity exists, repair open in pump ground circuit and repeat step 2. If continuity exists, check for continuity between connector Pink/Black wire and ground.
- If no continuity exists, check wiring at fuel pump/sending unit. If continuity exists, check continuity across pump terminals. If continuity exists, go to step 4. If no continuity exists, replace fuel pump/sending unit. Ensure fuel pump/sending unit connections are okay.
- Turn ignition on. Using voltmeter, check for voltage between connector and ground. Voltage should be 12 volts for one second, then drop to zero volts. If voltage is incorrect, check wiring and repair as necessary. If voltage is correct, go to step 5.
- Turn ignition off. Using ohmmeter, check for continuity across pump leads. If continuity exists, perform FUEL PUMP PRESSURE TEST . If no continuity exists, check continuity at pump terminals. If still no continuity, replace frame-mounted fuel pump.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.