Skip the auto shop - Our mechanics make house calls

Q: Inertia switch/Fuel pump

asked by on

In August, my car died on a road trip in central Missouri. I had it towed to a shop where they informed me my fuel pump needed replaced. After it was replaced with a new one from o Reilly's, an hour down the road the inertia switch started failing. I had to keep resetting the button every ten minutes until it finally completely quit near Tulsa. Luckily a junk yard near us had an extra one and installed it, which got us back to OKC. I went to start my car yesterday, put it in reverse, and the car shut off. It turns over, but won't start. The whine of the fuel pump is no longer there when I turn the key (right before trying to get the car to turn over). My question is, does the inertia switch completely disable the fuel pump or should I still hear the whine of it? Is my inertia switch bad or did my fuel pump really quit working again? My warranty for the pump only works if I have the car worked on in that same shop in Missouri, but I live in OKC. Help!

My car has 200000 miles.
My car has an automatic transmission.

The inertia switch is supposed to totally disable the fuel pump power supply when the vehicle is in an accident or rolls over. You will need to check the power connector into and out of the inertia switch to make sure power is coming into the switch on the green wire from the fuel pump relay in engine junction box and out on the pink wire to the fuel pump. If you are getting power when you cycle the key on at both of the wires then you may have a bad fuel pump or connector at the fuel pump. Have the connector checked to make sure power is getting to the pump. If you are getting power to the pump when cycling the key then you will need to replace the fuel pump. again.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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!

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: Car will not start

This may be related to many different possibilities, some of which may be related to a lack of spark and some of which may be related to a fuel delivery problem or a combination of both. For example, if the...

Q: I can shift gears but it will not engage..just started slipping recently

As you know, the clutch transmits engine power to the gearbox, and allows transmission to be interrupted while a gear is selected to move off from a stationary position, or when gears are changed while the car is moving. Most...

Q: My car stutter starts, but only after driving it for a few minutes.

Hey there. This may also be caused by what is called the fuel pressure regulator. This is a unit that helps to maintain the fuel pressure at the proper level. When this is not working properly, the fuel pump may...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.