2 fuel pumps installed still no fuel pressure. Is the fuel regulator the only thing that sets what pressure your merc needs. No leaks, oh also gaurdian system beeps 7 or 8 times when key turned on can't find any gaurdian beep codes on line,?? Vacuum fuel pump constant is-5 psi, bulb stays hard. Regulator N/A from merc till mid July.
Please any help would be appreciated.
Please any help would be appreciated.