Question about 2009 Scion xB

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Electric fuel feed fuse

Hooked jumper cables up wrong

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  • Scion Master
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Ooops, This happens much more than you would think. Several things here to explore. You probably have more damage beyond the original reason you needed to jump start your car.

First, you can get helpful chassis and fusebox diagrams for free from Autozone.com when you register your car to the site.

Usually the Master fusible link around the battery will melt when this happens. There can be more than one location for fuses as the system breaks down the voltage to smaller units for each job.

You should have a Relay for the fuel circuit and these types of relays are in a Powerbox which is a Master power source for the smaller fuse holders in the fusebox.

You may want to ask your car insurance carrier about Comprehensive coverage which may cover this repair. Comprehensive is a catch-all insurance for oddball events like this.

Sometimes it is better to leave the battery disconnected and use an Ohmmeter to find out if the wires are melted or fuses are destroyed. If you had the Ignition key off when you jumped the wrong cable, then the damage may be minimized. The Ignition key would have kept some circuits turned off in its OFF position. Otherwise much more could have been hurt by this.

Your fuel pump pressure may be measured at a test tap above the fuel rail. You can borrow a pressure meter from one of the big autoparts stores like Autozone or any place with tool loaner programs. If power is restored, the fuel pump pressure should pressurize the system. If it does not, then check the fuse or the Relay before blaming the pump.

You may also need to borrow an electric injector tester. The fuel pump may work, and also the Relay to power it. But the brain of your car needs to tell the Injectors to work. It is a simply lightbulb shaped to fit in the socket of the Injector wires and it will show if the Injectors are getting juice to operate.

I hope you find my solution helpful. There really is not to much written about what can break when this happens.

If you get it running and a "check engine" light comes on, take it to Autozone, Oreillys, or Advance for a free scan to see what else is wrong.

Posted on Feb 24, 2012

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