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Are you getting the ignition activated voltage to the relay? If you are, and you can jump across the relay to turn on the pump, I would say your relay is defective. If you know the relay pins for the ignition input and ground, you should be able to test it outside its plug in socket. You should hear it click when +12V and ground are applied to the proper pins/connectors for the ignition voltage. An ohm meter could be put across the supply +12V and fuel pump pins/connectors to really check the operation. If you think your relay is good. I would start checking for a bad +12V connection for your ignition supply, as well as the +12V that is switched through the relay. And the grounds to all. Use some contact cleaner on relay pins and socket. Ignition switch contacts can cause issues too. If it stays broke at least it should be easier to find than something that is intermittent. Based on what you stated, most of your troubleshooting should be at the relay socket (knowing which connectors do what) to isolate the issue to the relay, your ignition voltage, or your fuel pump voltage. After that it is knowing which step to take next.
The relay should have been trouble shot BEFORE changing out the pump. If you've got 12v at the pump it is not the pump. Unless you installed a bad pump. But, no 12v at the pump= bad relay. But ten you've got to see what activates the fuel pump relay.
When you turn the key on it will only energize the fuel pump relay for two seconds , or until you crank the engine over . The PCM - engine computer controls the fuel pump relay . Watch this video Fuel Pump Electrical Circuits Description and Operation
I GUESS YOU HAVE TESTED FUEL PRESSURE.SO THERE IS A INERTCIA SWITH ON FIRD THIS SHUTS FUEL OFF IN CASE OF A WRECK THIS IS AT THE KICK PANELS IN FRONT MOST THE TIME I HAVE SEEN THEM IN THE TRUCK. IT HAS A RED BUTTON ON TOP IF YOU PUSH IT IN IF IT CLICKS IT HAS BEEN SET.IF THATS NOT IT MAKE SURE ITS NOT YOUR ALARM SYSTEM .FUEL FILTER COULD BE CLOGGED. CHECK FOR 12V AT PUMP. AND FUEL GAUGE
first step check fuel pump relay for 12v.If 12v is there check for ground on the coil side.if there is a good ground plug relay back in and see if there is 12v on the side of fuel pump.if there is under 12v the relay is bad if it does have 12v u have a bad wire to the fuel pump.
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