i have 2 firestone compressors on 2 three gal. tanks and i hate them. i don't know where to go for parts though. i don't like firestone equipement to much. but if you can rebuild them cheap than right on. i am running mine until i can save up for something better. sorry i can't help.
im just going to build them because they were free and theyll work for a bit... but then im goin with 2 AirZeniths on a 12Gal. tank... idk might need more than that compressor wise
while speaking with a firestone rep, "they cant be rebuilt to my knowledge"-mat friend of mine/firestone dealer.... "ill tell you what. switch those out... these are defective"