I don't understand why you're messing with the fuse box. If the fuel pumps don't energize, the likely culprit is the FPR on these decades old cars. It's a common failure.

To verify... if the pumps don't energize for about a second when you turn on the ignition, remove the FPR, jump pin receptacles 7 and 8, and if the pumps energize the FPR is faulty. (Also check the pins and receptacles for corrosion or damage that may be causing an open circuit condition.)

http://www.peachparts.com/shopforum/tech-help/416104-help-fuel-pump-power.html

Check Pelican for pricing, and they now offer a lifetime warranty most new parts.

You might want to keep a jumper wire in the glove box. If the FPR ever fails you can jump the pins to energize the fuel pump, which should get you home, but remember, what you are doing is "hot wiring" the fuel pump and it will stay energized until you remove the jumper or the battery runs down.

Duke