Skip the auto shop - Our mechanics make house calls

What Prevents the Fuel System From Leaking?

fuel leak

Leaking fuel is a hazardous and wasteful problem for a vehicle to have. Manufacturers know this, and to combat the problem they have implemented a number of simple ways to prevent fuel from leaking out of the fuel system:

  • O-rings: Small rings made out of rubber or similar flexible material. They are extremely useful at preventing liquid from leaking out of lines, hoses, and fittings. In the fuel system, O-rings are used to keep fuel from leaking around the fuel injectors.

  • Gaskets: Rubber seals that precisely match the outline of the part they are applied to. For instance, the gasket between the fuel tank and fuel pump prevents leaks because it is made to seal off the perimeter of the hole in the gas tank that the pump mounts to.

  • Hard gas lines: Much more durable than rubber hoses, hard fuel lines are used on many cars because they last a long period of time and they can withstand the abuse of being under a moving car all the time. Rubber hoses are used in the fuel system as well, but they are in accessible areas where they can be regularly inspected.

Despite all of this, gas leaks do happen. Gas is dangerous as a liquid and it produces dangerous fumes as well. A leak must be fixed as soon as it is noticed.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...

Related questions

Q: My car will cut out while driving (acceleration cuts out) & car will stop running

Hello. Being that this is a computer controlled vehicle this can be caused by a number of issues. From what you are explaining though it sounds like you have a fuel system problem. Most of the time this occurs if...

Q: Car jolts on starting and sometimes is fine

The vehicle may have more than one problem and would need to be thoroughly checked in order to properly diagnose the problem. I would recommend having a certified mechanic test the system's computer and perform a road test to see...

Q: Heard loud blast under van driving and floor is now west passenger

You may have had either a heater core that burst or the A/C evaporator that blew out. You need to identify the leak as coolant from the engine as it will have an oily feel and may have a green...