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 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. Inertia switch/Fuel pump

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: Truck will not start

Hello, thank you for writing in. The vehicle is most likely having an issue with the charging system. If the battery is dead, which it seems to be, then it has failed. The other option would be that the alternator...

Q: Was going fast and all of a sudden the rpm's shot up and the gears didnt want to switch normally

Hello there. Based on what you have written here, there could be multiple issues going on with your Chevrolet Tahoe. In general, when you're under acceleration and the engine suddenly revs up and stops accelerating, this is caused by a...

Q: Does 1997 Mazda have a reset button for the fuel injection system?

Hi there, thanks for writing in. Unfortunately a "reset button" for the fuel injection system is not something that exists. Has the fuel pump been checked? If you are not getting gas, the issue may lie in a bad fuel...

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...
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...
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.