This sounds like a failing fuel pump module. Namely that it is not pulling fuel properly and needs the pressure of a full tank of fuel to operate. Actually a common thing in the older GM vehicles as the pumps age. They crack in the reservoir or the pressure line above it or the pump itself doesn't act properly due to wear. The repair is to replace the pump module.
Repair calls for draining the tank, then removing the tank to get to the pump assembly retainer. Then removing the unit and reversing the process.
This is a guide on it showing a similar system:
As for the data connection, The 1995 Grand Am is one of GMs worst ideas. It is commonly called OBD 1.5 It falls between the older OBD I that could flash the light if shorted and the newer OBD II like more modern cars use. It was only on a few vehicles between 1994 and 1996 when OBD II took over. The problem is that a modern scan tool usually cannot read it unless it's a higher end unit with the correct software, and the older OBD I tools don't work either unless it is one with the correct software as well. Tools that do work on it are the OTC Genisys and the Snap-On MT2500 "brick" You can find those both reasonable on eBay if desired. Or find a shop that has one of them and knows how to use it.
Sunday, June 6th, 2021 AT 11:51 PM