Can you test a Ka fuel pump out of the car?

it should run in or out

Thanks. That's what I thought.

Hm. Forgive me for adding to the thread, and please feel free to tell me if this is not something you've encountered. The pump actually works - I just should not have tested it with a small motorcycle gel battery - I guess it needs a lot of current. But it does not work in the car. I can see 12v at the connector when I turn the ignition on, but nothing happens. I can't think of anything that would not cause the fuse to blow that could account for this. Would (weak) 12v still get through the relay, if it was faulty? Would the powertrain thing step in and turn it off if something else was wrong?

Put the pump back in circuit, and then measure for 12v, or connect a decent sized bulb in place of it. If there isn't 12v then, you have a poor connection or perhaps relay, that's creating high resistance. As a meter is high resistance itself, it's still possible to measure 12V but not at sufficient current to run the pump.

You could bridge out the fuel pump relay to test that.

Remember that usually the pump won't run continuously without a signal to say the engine is running or being cranked, and also that there's usually a cut-off switch that activates in a crash- these can be faulty.

Thanks for the suggestions. Yes, I'm only expecting it to run for a few seconds. I've made sure the cutoff is pressed in (it already still was), but I'll try to bypass that, too.