Q: My car is making a knocking noise and there's a fuel leak

asked by on

When my car turns on it acts normal then 5 mins later fuel is leaking a knocking noise starts the car will not go forward but when i backup it goes very slow

My car has 25000 miles.
My car has an automatic transmission.

You need to have the fuel leak fixed ASAP. A fuel leak can cause a fire and at the very least it will reduce your fuel mileage. Fuel leaks are no different that a leaky water pipe in how they leak. Difference fluid and more pressure, but leaks are leaks. You first need to locate the leak before you can know what needs to be replaced. I recommend having a fuel is leaking from the gas tank inspection. Include a note to the mechanic, if you choose one from YourMechanic, when you book this appointment letting him know you are not sure where the leak is coming from.

The knocking noise is another issue. There are dozens of things on a car that can cause a knocking noise. Although, with the given description, I could say that maybe there is a drive line problem. This would be an axle, drive shaft, or transmission issue. Locating where the knock is coming from should reveal what the issue is. If the noise begins when you put the car in gear and attempt to go forward, one of these is most likely the cause. I recommend having a car is making a noise inspection.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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!
  1. Home
  2. Questions
  3. My car is making a knocking noise and there's a fuel leak

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Hello. I live in GA and have an oil leak but the check engine light is off. will I pass emissions? 2005 Volkswagon

Hello - YES, as long as the oil leak isn't causing a misfire and there are no pending codes (Check Engine not on yet), you should be fine. If you are anxious about passing the emissions test, you can always...

Q: Won't start

You first need to check and see if the engine has lost fuel pressure or spark. If you lost fuel pressure then you need to locate the fuel inertia switch in trunk on the trunk hinge bracket. The switch will...

Q: Knocking while idling.

The description you have given is rather vague, but it could be that what you are hearing is timing chain noise. This engine is well known for having timing chain issues. In fact, Chrysler even issued a recall for this...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...