Probably not, but if the furnace or a part of it was submerged you should have it checked out.
You can find a schematic for a gas furnace on the website, Uncionradio.
There are many places to find gas furnace prices. One can look on sites like Furnace Price Guides, Century Gas Furnace, and Consumer Reports. One can also find gas furnace prices by going to a local heating supply store.
An old furnace that has a gas-like smell emitting from it likely needs to be replaced. More importantly, it is necessary to call your local Gas company to check for a gas leak.
The most important risk in using a gas furnace is carbon monoxide. If the heat exchanger in a gas furnace is damaged, carbon monoxide could leak into the air, causing a health hazard. A carbon monoxide detector and regular inspections would greatly reduce the risks and your worries in using a gas furnace.
You obviously can't ask a question properly and you have a leak in your plumbing.
One could find information on gas furnace troubleshooting online at Ask. Hvac for beginners is also a great place to look. One could also contact their local gas furnace dealer and/or repairer for gas furnace troubleshooting.
an electric furnace runs off of 208/230 Volts while a typical gas furnace runs off of 120 also a gas furnace will have a valve for the gas relay where the gas enters the furnace.
Find the leak, and fix the cause.
if you smell gas but cannot find the leak or source immediately get everyone out the house and go to the neighbors. call the police and then they will handle it from there
On the inside of one of the removable panels
Gas leak. Very dangerous situation. Stop driving this car until you find the leak.