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

11 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.

6 out of 6 people think this is 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.

6 out of 6 people think this is 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 out of 3 people think this is helpful.

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

22 out of 22 people think this is 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 out of 3 people think this is 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 out of 1 people think this is 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".

6 out of 6 people think this is 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 out of 2 people think this is 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 out of 3 people think this is helpful.
Cheyenne Renee

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.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions


Looking for a Used Sonata in your area?

CarGurus has 51,699 nationwide Sonata listings starting at $1,200.


Search Hyundai Sonata Questions

Hyundai Sonata Experts

#1 toDumbToNotKnow
Reputation 1,270
#2 Tom Demyan
Tom Demyan
Reputation 1,130
#3 dandyoun
Reputation 910
View All

Related Models For Sale

Used Honda Accord"
1,272 Great Deals out of 77,636 listings starting at $1,395
Used Toyota Camry"
1,593 Great Deals out of 98,101 listings starting at $895
Used Hyundai Elantra"
848 Great Deals out of 51,287 listings starting at $1,995
Used Nissan Altima"
1,377 Great Deals out of 87,440 listings starting at $1,195
Used Honda Civic"
1,125 Great Deals out of 58,106 listings starting at $1,300
Used Toyota Corolla"
1,435 Great Deals out of 66,812 listings starting at $1,295
Used Chevrolet Malibu"
1,147 Great Deals out of 72,633 listings starting at $695
Used Nissan Maxima"
459 Great Deals out of 24,110 listings starting at $800

Used Cars For Sale

2017 Hyundai Sonata For Sale
20,849 listings starting at $16,016
2016 Hyundai Sonata For Sale
78 Great Deals out of 8,079 listings starting at $11,573
2015 Hyundai Sonata For Sale
184 Great Deals out of 4,913 listings starting at $9,191
2014 Hyundai Sonata For Sale
92 Great Deals out of 1,989 listings starting at $7,777
2013 Hyundai Sonata For Sale
322 Great Deals out of 6,014 listings starting at $6,696