Slow Gas Leak - is this dangerous? How much to repair ?


Asked by Apr 26, 2013 at 10:42 AM about the 1999 Hyundai Sonata

Question type: Maintenance & Repair

Hi I have a 1999 Hyundai Sonata and I am leaking gas underneath my car .. it's a slow drip but I think it's getting worse there seems to be an even slower 2nd spot .. If my car sits for a few hours there is a noticable small puddle.  If been driving it a month now .. is this dangerous ??  Does anyone know how much this problem might cost? I'd like to be a bit more knowledgeable before I went into the mechanics

13 Answers


Yes. Extremely dangerous. Climb under car and try to locate leak. Could be something as simple as a loose fitting or a pin hole in fuel tank due to hitting something in road way. Use extreme caution with this leak. Specially if it near your exhaust system. I would not drive it till leak is located and repaired due to the fire hazard.

7 people found this helpful.

Hi there, yikes! I've been driving it about a month like this... The leak is nearer the front of the car..maybe a bit forward from the drivers seat underneath.

7 people found this helpful.

Any fuel leak is dangerous, as it is a 99 I would check on getting a good used fuel tank and replace the fuel pump in the tank before installing it, or if your really tight on budget you can transfer your working fuel pump sender assembly out of your leaking tank into the good used tank. Hope this helps.

3 people found this helpful.

Does anyone have a guestimate on how much something like this costs to fix?

31 people found this helpful.

Some cars have fuel filters mounted in that area. not sure if yours does or not. That is typically the area on a car where two fuel lines join together. One going to tank and other routing to injectors. Could be loose fittings. Might be able to see leak from under hood right along the fire wall of engine compartment. Extremely important to find the leak.

3 people found this helpful.

I've looked up the filter location and what I'm getting is that it is located in the fuel line in front of the tank... Would that not be towards the back of the car? Ugh I'm such a typicalgirl when it comes to cars. Thank you everyone for your help.

1 people found this helpful.

It's a fourteen year old car. It has steel fuel lines. The steel lines have rusted and fuel is seeping through the rust holes. I had the same thing with my Pontiac a few years back. In my case, it was a rear brake line and the fuel lines were just as bad. GM sells the lines and they are called a "bundle".

7 people found this helpful.

In my case, the rear drums where rusted on. They had to replace the drums and the rear brake wheel cylinders to bleed the new brake lines. My total bill was $800 for the new lines, rear brake drums, rear wheel cylinders and installation.


Ugh 800 dollars is not feesible.

2 people found this helpful.

Don't get to scared yet. Inspect fuel lines. Yours should look similar to the picture tenspeed listed. He is probably right about the leak tho. But yours may be much cheaper to fix.

3 people found this helpful.

How can you tell if you have a gas leak?? I just got this car and I had about half way between 1/4 and 1/2 a tank this morning once i got to work I had a quarter... Its only 14 miles I dont think I should be using that much gas at all even if it is older. I have an 08 sonata.

4 people found this helpful.

What does it mean when you smell gas in your car is that the filter or gas leak please help

2 people found this helpful.

If your smelling gas at anytime around your vehicle get it checked out ASAP cause fuel leaks of any kind can seriously ruin your day as well as your car, it can be anything from a split canister purge hose to and all out high pressure fuel line spraying fuel everywhere, so get it checked, if you feel it's unsafe then call one of those "will come to you guys" at least you will find out if it is serious enough to have it towed or if it can be fixed on the spot.

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