fuel pressure regulator?
Follow up to my angst-filled O2 posts below.... after reading some posts here and elsewhere, I picked up a fuel pressure gage from AZ. Connected to the schrader valve and turned key to start-
13psi from the fuel pump
Started truck (03 Ex, 4.6l), pressure jumped to 53psi.
Disconnected fuel pressure regulator vac hose - 53 psi.
No vaccum gage on hand, but I could hear and feel strong vac from the regulator hose, so I am assuming it is good.
My Haynes manual says idle pressure w/vac = 30-40 psi, 40-50 psi w/out vac. I should notice a "significant" jump in psi when vac is removed. Nada.
Reved truck with accel cable, no change in fuel pressure at all. constant at 53psi.
Shut truck off. psi dropped to 43, held steady until I relieved pressure via gage.
I do not have the vacume gage to test the regulator per se. It seem fairly clear that the regulator is not working.
Could this be causing the "rich" condition seen by Bank 1 O2? Either way, it cant be good. What causes a regulator to go south?
Any thoughts or other suggestions? LIke, how do i take the regulator off? I think I see a compression ring in there. I"m guessing - relieve pressure, move stuff around, take ring off, remove old, add new, replace ring, replace vac line, retest.
thanks for this great forum.
Last edited by waterman308; 08-03-2007 at 07:21 PM.