Check to see if the fuel pump resistor has been removed (or by-passed) by the previous owner. It's a white ceramic oblong-looking thing with 2 wires connected to it, and it's
mounted on the inner fender, driver's side, in the engine compartment.
Ordinarily when you first turn the ignition ON, the fuel pump is given 12V DC for (only)
a second or two in order to build up fuel pressure. After the engine is started and running, the fuel pump is given about 6V DC that comes through the fuel pump resistor.
Some owners will sometimes by-pass or eliminate that resistor as a "shade-tree fix"
for a fuel pressure problem.
The downside of that "fix" is that the fuel pump is then running at 12V DC at 100% of
the time (= spinning faster; is more noisy; wears-out faster).