Is there such a thing as fuel senders-told let gas get to low- cost 768 to fix?

What is your question?

Part#6F97-9A299-A & 6F97-9275-A no diagnosis code given. Had 2 problems Wrench and passenger air bag came on first then went off. Then Engine pic came on and stayed. Got book out of glove comp. to see what pics were and passenger side was wet, but also wet around sunroof. Told two problems- did not check out blockage in sunroof or leak in windshield or whatever but was told Engine problem was fuel senders. The light on dash said 29 miles left before fuel light came on and got gas. Vehicle still runs perfectly just picture when first happened and wet ran perfectly but speed oil everything did not move in console even lights off when dried out everything works fine bu light still on so concern is if still getting fuel and still running what are these expensive fuel senders that need replacing?