View Full Version : fuel pressure problem st 185

06-24-2012, 09:06 AM
have new tomei big fuel,when installed the pressure did not go up more than 38psi minus the vacuum and with vacuum ,so we figure it out maybe have fuel pump problem,so buy a new tomei pump,then installed,start,the pressure goes up 40 then go down 20 psi,check the pump by hearing it,it has a sound like growling like air,need help.:sad2:

06-25-2012, 12:35 AM
Sounds like your having a problem with the fuel pressure regulator.