FP & MAF Relays share continuity?

[SC74]

I sporadically get good fuel pressure. Sometimes it will run perfectly and other times it starves for fuel. By grabbing the fuel line it has steady pressure when running right and on/off pressure when not running well. I bypassed the inertia switch - same problem. I swapped fuel pump relays - same problem. Still hit or miss. It throws code 95 about FP ground and everyone points that to a relay so that's what got me testing continuities.

Last time I got it to run well I had just checked my fuel level by opening my fuel cell. I thought it was a vent problem, but I have not re-created the problem since. Maybe it's gone for good, who knows. My luck it will come back at the worst possible time. I just want to know what to do to fix it when it does come back.