the regulator is on the end of the fuel rail (fan side), there is a sendor on the fuel rail that shuts off the engine if it senses that there is not enough pressure in the line so that you don't run lean and run hot (lots of bad outcomes) the fuel should spray pretty hard out of the line you disconnected earlier, I have seen the filter socks on the end of the fuel pump clog up too, and pumps do sometimes go weak. check it out more and get back to us
Sold) 94 YJ, 4.0L 5 sp manual, Hard top, 33/12.50s, 4.10 ring&pinions, Polished D30 w/Aussie front, 8.8 rear w/ LS, 2.5" RC, 2" BL, 5/8" booms, TJ flares, SYE, custom F/R bumpers and rock sliders, 8k winch, dual optimas, HO alt.
2) (Sold) 99 TJ, mustang 5.0 GT 40, AX15/231J, trektop, 37x12.50r17 cooper STT, superlift 6" long arm, D30/44 w/ ARBs & yukons, customized warn bumpers, custom sliders, 12K winch w/ synthetic rope, custom paint
3) 2007 JKU being built now