Shaky logic here.
FPCU can fail other than by shorting to ground.
If fuse was blown,it would stay blown.
More to the point,they don`t share the same fuse.#13 for the solenoid,#5for the FPCU.
Blown #13 = no ignition,or temp,fuel gauges.
Perhaps your thinking of the ASV rev sensor.
It is powered by #13.
Actually, I'm thinking of the EA82 setup from an '87. It has only one REV sensor and it controls fuel pump and ASV.
I don't know why but I thought this thread was about an 87 not an 83. Admittedly different.
I don't have my 83 manual here with me to look at, but Naru sounds like he's right.