Q: Fuel gauge keeps jumping back past the E on the gas reader

asked by on

When I out gas in car, it reads ok on whatever I put in. But once driving from time to time , really when it's on low gas, the meter will jump back past the E and drink up gas. Then the gas tank makes popping noises. So when ever time I open gas cap , vapors shoot out like a torch

My car has 209000 miles.
My car has an automatic transmission.

Hey, thanks for writing in. There may be two different issues at play here.

  1. Your fuel gauge sending unit may be faulty which is what causes the fuel gauge to fluctuate erratically not reading correctly. This is a small float assembly inside the fuel tank that reads the fuel level and relays this to the computer which then sends this info to your gas gauge in the dash.

  2. You may have a problem with your evaporation emissions system which is responsible for harnessing the fuel vapors inside the fuel tank and expelling them properly by storing them in a charcoal canister and then later released into the atmosphere by use of a purge valve. When this part of the evaporative system is not working, you may notice a large buildup of fumes which is released as you have experienced when opening your fuel cap.

If you’d like to have this looked at, I would recommend having an expert from YourMechanic come to your location to diagnose your issue and service your fuel sending unit and evaporative emissions system as necessary. Best of luck.

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. Fuel gauge keeps jumping back past the E on the gas reader

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: Check Engine Light is on - 2007 Toyota Sienna

This code relates to a heated oxygen sensor which is a unit inside your exhaust system that reads exhaust gases and relays this information to the car's computer. The computer uses this information to make adjustments to fueling. This sensor...

Q: Car chugs & dies when gas gauge gets to 1/4 full

The fuel sending unit is not accurate and is empty at 1/4 of a tank, or you have a fuel pump that has a faulty bottom screen which has come off and sucks air below a 1/4 tank. A big...

Q: Car is leaking coolant and overheating

You should not let the engine ever run low on coolant. When you get the system checked the mechanic will pressure test the cooling system and locate the leak or problem for you. You should not have a hot engine...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.