Greg, Like Tom said you can see the MAP hose at the rear of the plenum, it runs under the Fuel Regulator. There is a test procedure in the Helm for checking the pump out put pressure. I can type you a copy of the manual's procedure if you like. Oh, I don't have a Tech1A either. I have an old snap-on MT2000 with the proper GM software plug-in that I used to scan my motor.
There are two fuses, one on the regular panel and one on the stuff attached to the CDM box brkt. I'm doing this from memory so bear with me. The test is started with a KOEO test w/ a pres gauge attached at the schrader valve at the front of the right fuel rail. You can leave both fueses in & turn key on & see pressure. Should be about 50-55 psi. Then pull secondary pump fuse and repeat, should be 50 - 55 psi. Then pull primary fuse and repeat...50-55 psi. Then start motor both fueses in and pressure should be 45-50 psi, and shut down and see how fast it leaks down...I don't remember how much leak down is okay. The thing is the pumps only both run for the first little while...by the time the motor gets to "closed loop" w/no full power the secondary shuts off & remains off till the power key is turned on.
If you don't have a Helm I'll copy the exact info & post up....my recollection skills are not that good on something I don't do every day!
Tom