2005 Honda Accord LX was rear end in a collision, but no major damage to bumper, but won't start now, is there a fuel pump cut-off switch I can reset or something?

is fuel pump coming on -----start checking to see if pump is working and that it and or wiring not damaged

If it will start with a jump you need to check the battery and charging system . The fuel pump shutoff would keep it from running altogether .

cant be that bad a hit if air bag did not deploy

fuel system may have shut down

if the engine light is on when it cranks over
there will be fault codes in the computer

disconnect both battery terminals wait a bit reconnect
this will reset the engine computer and car should start up

if still no start will be a tow

if you feel savvy enough, check to see if it produces spark and also check if the fuel pump is working. If no spark usually a problem in the distributor. if no fuel coming out of the fuel line, maybe bad fuel pump. need to check if pump is not working.

Many vehicles have a fuel shut off switch that cut the fuel pump of when the vehicle is in a collision, I believe the one on the Honda is located in the trunk (boot), it looks like a relay with a button on top, the button needs to be pushed down to reset, you should hear a click. If it is not in the trunk, look across the bulkhead or inner wing area, a Honda agent may give you a better location.

Have you checked if there's an inertia switch. This switch cuts off power to fuel pump in case of a collision, although it could fail for no reason. it is usually losated near the front or rear bumper.

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Ignition switch was my problem after changing fuel pump and main relay. Then had to have transmission rebuilt, all of this was back to back.

My recommendation is to look for the Fuel Pump trip switch and reset it.

During a collision a sensor is able to sense impact and trip so fuel is not pump any longer.

With the car in the on but not running position see if you can hear the fuel pump.

If you can then the car has other issues.

Hope this helps

Some cars have an inertial shut-off switch for the electric fuel pump. That switch is sensitive to impact and is designed to shut off the fuel pump in case of collision.

After a collision it may be hard to tell where the fault lies.
I would start by checking all connections in the engine bay as well as for any damage to the wiring.
Does your radiator still have fluid? If this has leaked out, then your engine could have seized.