My stang was ordered with 308 gears from the factory, last 19 years( minus last ten months )(health) I have driven the :poo: outta her. With the t5 in fifth gear I crisis hyway at 70-75 mph and it spins at 2'000 ish rpms.
Your o.e.m. uppers are the weak link, cause I've been side stepping my clutch for years without any hop, I've got metco adjustable uppers and lower arms with greasable bushings.
Ftw go electric, I've had the flexalite Black magic extreme fan on my daily driven 93lx for 19 years so far.
Oh by the way I live on the surface of the sun( nevada)
New or old pump shouldn't matter, full or empty either way the ecu sends power the pump to prime then shuts it till the engine is running.
Your constant running is somewhere in the wires ,ecu, relay?