Turn the switch to crank, fuel gauge goes to full, security light on want start.

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Next time cranks and runs good. If security light is on and fuel guage on full will not run. Once it clicks off full and light goes off cranks and runs good. What seems to make the problem better or worse? Nothing I've noticed How long have you had this problem? Months and months started out only tool a minute for it guage/light to go off. Now it can take hours.