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

asked by on October 25, 2016

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.

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

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I jump-start my truck?
If the battery of your truck dies, it will need to be jump-started. Jump-starting the battery is an efficient way to get power back to your vehicle. You will to need a booster vehicle to jump-start your truck. To jump-start...
Belts squeal when starting, turning, and going in reverse.
This could be just a simple belt adjustment since you have multiple belts on your car. I do not see a belt issue when going into reverse but turning could be the power steering belt is loose. I would recommend...
Code is P02990 what does it mean?
Hello, thanks for writing in about your Buick Cascada. Trouble code P0990 is a transmission fluid pressure fault. Possibly an internal fault in the transmission or there is a fluid leak (https://www.yourmechanic.com/services/transmission-fluid-is-leaking-inspection). If the car didn't make it home, I...
Water in dry clutch system
If all the covers, plugs, and shields are in place, water in the clutch is usually not a problem. Some cars have their timing marks on the flywheel and the plugs get left out by somebody checking the timing, or...
I hear a water sloshing sound when I start and when I stop the car
Hi there. Getting a second opinion is always advisable when it comes to working on your vehicle. The sloshing sound you hear, when your vehicle starts, most likely is air trapped in the heater core. The solution to this problem...
I cannot find a computer with the Part #. 1860A799. Can I use another part number that looks the same?
Hi there. The part number that you have is specific to your vehicle's computer system. If you are wanting to replace the computer with an aftermarket computer, you can but you will need the computer flashed (programmed) to the VIN...
P0014 Code, Replaced both camshaft actuators
You will need to have the vehicle scanned with a scanner that is capable of actuating the solenoids and monitor data at the same time. The actuators when actuated at 1200 rpms should cause the rpm to change up and...
Steering wheel turns all the way around after getting stuck in the snow.
You must of damaged and broke the steering gear on the car. I would suggest you have the car towed. If the steering turns all the way around and around then the air bag clock spring may have also got...
Rear wiper arm
The rear wiper arm (http://lgcdn.morris4x4center.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/j/e/jeep-wiper-ramp_1676.jpg) is part of the collar that you are referring to. The arm and collar are made and molded together. Once you remove the retainer nut you can use a small puller to grab the arm...

Related articles

The Best Used Cars to Buy If You're a Doctor Who Makes House Calls
If If you are a doctor who makes house calls, reliability is likely to be at the forefront of your mind when it comes to choosing a used car. You also expect a certain level of comfort. We have evaluated...
Symptoms of a Bad or Failing Fuel Return Hose
If your car has a carburetor and it gets flooded, fuel is leaking, or the car smells of gas, you may need to replace the fuel return hose.
How Long Does a Cold Air Intake Last?
The The cold air intake’s purpose is to help bring cool air into the vehicle’s engine. It does not come standard on modern vehicles. Instead, it is an aftermarket part that can be added once you purchase the car. If...