F150 fuel pump

In my 1990 F150 4.9L manual transmission, the fuel pump continues to run for 2 to 10 minutes after I turn off the ignition. Does anyone know what might cause this, and is it considered serious?
Thank you in advance for any help.
George Ahearn
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If you switch tanks, does the other pump run too? Probably the pump relay is stuck. Eventually, it's gonna run all night, and you're going to be greeted by a dead battery in the morning. Try pounding on the firewall behind the brake pedal to see if you can un-stick it. When I replaced mine, the relay cost a little over $50. I was worried the engine would fill with gas, but the fellow at the dealership said it wouldn't, and it didn't. Good luck. Tom Flyer
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If you switch tanks, does the other pump run too? Probably the pump relay is stuck. Eventually, it's gonna run all night, and you're going to be greeted by a dead battery in the morning. Try pounding on the firewall behind the brake pedal to see if you can un-stick it. When I replaced mine, the relay cost a little over $50. I was worried the engine would fill with gas, but the fellow at the dealership said it wouldn't, and it didn't. Good luck. Tom Flyer
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