4WD AUTOMATIC. 77,462 MILES. Hello, I have a 1986 xl bronco (basic work edition, bottom of the line) The engine is the electric fuel injection, 302 5.0L. I have recently had problems with not getting electrical fire on the spark plugs. The coil IS getting power. I checked with a test light. Also, the fuel pump (s) do not prime, nor run
FuelPump and filter replacement won't start, things to check https://youtu.be/JvgKGJjAwU0
Whatare the signs of a bad fuel pump relay? Signs of a bad fuel pump relay include the fuel pump not priming when the ignition is turned on, the engine cranking but not starting, and a lack of fuel pressure. Additionally, you may hear the fuel pump relay clicking repeatedly.
Adda Lift Pump. Like all Duramax engines from '01-'10, the LML was also void of a lift pump from the factory. This means that not only does the CP4.2 have to pressurize fuel as high as 29,000 psi before sending it to the rails, but it also has to pull its low pressure fuel from the tank.
Headlightwasher pump relay: 2: Booster Fuel Pump Relay - Diesel: 3: Starter relay: 4: Headlight washer pump relay: 5a: Start relay (fuel system) 5b: Relay for auxiliary heater: A: 30A Thermo fuse 1 for adjusting the position of the driver's seat: B: 30A Thermo Fuse 2 Seat Adjustment Driver

Thisis often referred to as a "starts and dies" condition. This can be caused by worn out tune-up parts, fuel injection problems, vacuum leaks, contaminated fuel, weak fuel pump or fuel pump relay, bad contacts in the ignition switch, key code problems, or problems with the ignition coil or module.

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when a fuel pump relay is bad