My outside outlet has a flap but son pressure washed house using it. Now will not work I think he had it gotten wet. If I replace outlet would that work?
That may not be necessary. You may have tripped a circuit breaker or a GFCI device.
Once you are sure it is dry, before you replace the cover, you can try to reset the outlet. All modern outdoor outlets should be GFCI, with a device in the outlet itself, somewhere back downstream on the circuit, or at the main panel.
Turn the circuit breaker back on, and then find the GFCI device and reset it. This may solve your problem. If not, you may need a new outlet or GFCI device. If there is no GFCI device in the circuit, by all means replace the outdoor outlet with a new one.
If the seals around the outdoor outlet cover are not in good shape, you may want to replace that as well.
I would turn the power off pull the outlet out if it is wet dry off water may have entered the box and is causing the outlet to fail. If it is dry you will need to replace the outlet as water is probably inside the outlet and may have damaged the electronics. Make sure to check outdoor GFCI’s test button prior to use for a double check that it is working correctly.