Testing the 240 fuel pumps is a breeze (by jumpering 2 fuses). Not so easy on the 700, but here's what I would do...

1) Disconnect the fuel line at the injector rail and route it into a safe container. (Skip this step if you just want to hear the pump run.)

2) Remove Intank pump Fuse 11 and improvise a jumper wire to apply voltage to the Fuse 11 terminal that is farthest away from you, i.e., toward the engine.

You can get battery voltage from the Fuse 1 terminal closest to you, after removing the fuse. Use a jumper wire with a flat male terminal on each end to take the voltage voltage from F1 to F11.

The Intank pump should push a good flow of fuel (thru the unpowered Main pump) all the way to the injector rail.

To run/test the Main pump, jumper voltage to the other F11 terminal, the closest one.

NOTE: This is from a '93 Green Book wiring diagram, which is all I have. It should work for you if Fuse 11 is for your Intank pump.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.