Skip the auto shop - Our mechanics make house calls

Symptoms of a Bad or Failing Fuel Pump Shut Off Switch

fuel pump shutoff switch

Bad or Failing Fuel Pump Shut Off Switch Inspection

by a top-rated mechanic at your home or office

The fuel pump shut off switch is an electrical switch that is found on certain vehicles equipped with internal combustion engines. Commonly referred to as the inertia switch, the fuel pump shut off switch is designed to shut off the fuel pump when it is detected that the vehicle has come to an unusually sudden, or forceful stop.

In the event of an accident or collision, where it may be possible for fuel lines or hoses to become damaged, the fuel pump shut off switch will deactivate the fuel pump in order to stop flow and prevent fuel leaks from becoming a potential safety hazard. The switch will usually come with a reset button that will reactivate the fuel pump if the switch was tripped.

The fuel pump switch is an electrical component, and just the same as the rest on the vehicle, over time it can wear out and develop issues. As the switch has the capacity to shut off the fuel pump, issues with it can potentially lead to drivability and performance issues for the vehicle. Usually a bad or failing fuel pump shut off switch will produce a few symptoms that can alert the driver of a potential issue.

HAVE SYMPTOMS OF CAR TROUBLE?
Get an $80 diagnostic
by a top-rated mechanic at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

1. Engine suddenly stops while driving

One of the first symptoms of a potential issue with the fuel pump shut off switch is an engine that suddenly stalls while driving. If the fuel pump shut off switch malfunctions while the engine is operating it may shut off the fuel pump and cause the engine to stall. The fuel pump may be reactivated by finding and pressing the reset button for the switch.

2. Switch that trips for no reason

Another symptom of a problematic fuel pump shut off switch is a switch that trips for no apparent reason. A good switch will shut of the fuel pump when it detects that the vehicle has come to a sudden or violent stop, a faulty switch, however, may trip and shut off the fuel pump for no apparent reason, even when the vehicle is experiencing normal driving conditions. The switch will have to be continuously reset in order for the vehicle to drive.

HAVE SYMPTOMS OF CAR TROUBLE?
Get your car fixed at your home or office.

Get a quote · Book an Appointment · Our expert mechanics come to you.

3. No start condition

Another symptom of an issue with with the fuel pump shut off switch is a no start condition. If the switch malfunctions it may permanently disable the fuel pump and produce a no start condition. The engine may still crank when the key is turned however it will not be able to start due to a powerless fuel pump. The fuel pump may remain disabled, sometimes even if the reset button is pressed, until the switch is replaced. A no start condition can also be caused by a wide variety of other issues, so having the vehicle diagnosed is highly recommended.

While many fuel pump shut off switches will usually last the life of the vehicle, they can sometimes fail and cause problems with the drivability of the vehicle. If your vehicle is displaying any of the symptoms above, or you suspect that your fuel pump shut off switch may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the switch should be replaced.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Still not sure about your car's issue?
Diagnose your car
What kind of issue are you experiencing?
Brakes are squeaking
Car is not starting
Car is overheating
Car is shaking (vibrating)
Fluids are leaking
Heating and A/C
Smoke or steam is coming out of the car
Warning light is on
Icon-warranty_badge-02

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

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.

GET A QUOTE

More related articles

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...
The Traveler’s Guide to Driving in Malaysia
CraigBurrows / Shutterstock.com Malaysia is a popular destination for many tourists today. The country has amazing sights and attractions that you will want to explore....
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...


Related questions

Q: Gas gauge not registering fuel level

Hi there, and thanks for asking about the problem with your 2016 Lexus RX450H. This doesn't sound like a tank problem, but rather the scenario where the tank includes 2 fuel gauge sensors, and 2 fuel pumps - a fairly...

Q: How do you dim or brighten the interior lights?

Your car is equipped with adjustable interior lights to provide better visibility during different driving conditions. They automatically turn on when you turn on the headlights, but you can manually control their brightness with the panel dimmer control. Here’s how:...

Q: My 2007 Grand Caravan has hard detonation problems.

Hello. Engine detonation and power loss can be caused by a few different things. Keep in mind that engine detonation can quickly become a bigger issue if left unchecked, and in serious cases can even lead to engine damage. It...