Question about 1987 Ford F 150
Put a new ignition switch on steering column. Afterwords hooked up wires and turned ignition on. Everything worked fine, all circuits operating as should. I realize as I try and start it that the battery is too low from having the doors open and the radio on. So I put battery charger on battery , negative on neg, positive on pos. switched to 35 amp. fast charge and went on to fixing other things around yard. Later, come to find out that I had left the ignition on and now have the problem of the fuel pumps not responding and the fuel system not pressurizing when the key is turned. Engine is 4.9 L. 300 6cyl. Maybe a relay or something, don't think it has an inertia switch. Checked fuses under dash with test light and all are good. Maybe a relay?
Check there should be a fuse box under the hood are some small little black are green boxes under the hood one of them is your fuel pump relay.
Posted on Feb 16, 2009
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The fuel-pump relay unit is responsible for turning the fuel pump on when it detects the engine is running. When the ignition signal stops, the fuel-pump relay switches the pump off. Problems with the ignition and starting the vehicle often can be traced to the condition of the fuel-pump relay.
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