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I've got a1990 f150, 4.9, 4wd, single gas tank. When you go to start the truck , you can hear the fuel pump run, build pressure and cut off. the problem is this could take 5 seconds or 5 minutes. The truck won't start until the pump has gone silent I'm guessing this because the pump has not built pressure I replaced the pump , made no difference. Any ideas?
 
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