Gas line leaking by engine how do repair that?

Only two are fuel lines, the main feed to the engine and the return line from the engine to the tank. One other gas tank line will be the EVAP line for sending gas tank fumes from the charcoal canister to the engine's intake manifold.
I think the other lines would be your brake lines to the rear wheels.

YouTube has many videos on repairing rusted fuel lines. Most people use the lines made of plastic in their repairs-takes special fittings though. These plastic lines have become very common now. In fact my '92 LeSabre has mostly plastic lines.

The reason can be faulty fuel supply system. There might be any damaged fuel supply line which may be leaking the fuel. Check for the damaged pipe and repair or replace the pipe. It is not necessary that engine is burning gas fast, leak in fuel supply line may also result in more gas consuming vehicle.

Lets start with the simple stuff first. Look under the car see if its leaking gas possibly from the gas tank or the gas line. Then with the car not running look around the engine compartment and see if you see any gas leaking. Also if the gas smell is stronger in the engine compartment. Look at your gas line especially toward the top of the engine you may spot the leak. I need to caution you if the leak is in the engine compartment and your handy and you can repair it that's excellent. But if you do spot the leak it might be very dangerous to drive the car somewhere. Gas leaks can be very hazardous if they are in the engine compartment. If your not handy then I would recommend you contact your local auto repair shop for repairs.

I hope this helps you out, if it does please give me a YES on the web page you just recieved my response on. Thank you.

Hello Sandy. This is a dangerous problem that will result in a terrifying engine fire if you continue to drive. Please call a repair shop as soon as possible and tell them what is going on. You may have to have the car put on a flat bed truck to get it to a repair shop safely. Joe

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Make sure you have the lines attached correctly on the sending unit and make sure there no small holes in the line. The pump pulls fuel and will draw in air. To make sure the pump is good, attach the tank side to a container of fuel and see if the engine starts. (keep the container below the pump or it can start a siphon and appear to be OK when it's not)
If the repair to the sender involved soldering up a line leak, make sure the line is not still leaking and that the line has not filled with solder.
It's a really simple system...there are no "trick" items there. If everything is intact and the pump is good, it has to work!!!

More than likely you have a busted fuel line, or one of the connections from the fuel lines to the fuel pump is broken. If you know how to repair cars, drop the tank and find the leak. If you don't know how, have the vehicle towed to a shop. Driving the car would definitely be a fire hazard.

The two trans cooler lines run from the trans to the radiator,they are routed along the engine block.
If you can find which one is leaking you can cut the line and install a piece of 5/16 rubber gas hose and two clams to repair it.

There is a leak in the line itself. This happens over time from road grime. You can repair this yourself quite easily once you pinpoint exactly where the leak starts. Hope this helps.

1. The fuel lines may have a leak: Replace leaking fuel lines and/or fuel line fittings.
   
2. The engine may have mechanical problems: Check vacuum lines and fittings for leaks. Check engine compression. Check for broken fittings and mounts.
   
3. The fuel pressure regulator may be operating at too high a pressure: Perform fuel pressure test and repair or replace faulty component(s).
   
4. The ignition timing may be set wrong: Check and adjust ignition timing.
   
5. The fuel injectors may leak: Clean or replace fuel injectors.
   

DO NOT DRIVE YOUR CAR until this problem is identified and repaired. !!!!! Your fuel lines run up along the drivers side and into the engine bay. One of those lines is leaking. If you drive at all, you are in serious risk of having the vehicle go on fire!!! Your fuel system is pressurized and can leak substantially. This is not something to mess with.!!!!!!!!!!