QUOTE(76-914 @ Apr 4 2010, 09:50 AM)
Is it recommended to change out the fuel PRV (pressure reducing valve) after installing a fuel pump. I ask because I notice an appx 2psi gain when I installed the new Bosche OEM fuel pump. I installed a new pump after the engine quit and I noticed the pressure at 15 psi. The next am it started and pressure was again at 30psi but I wasn't taking any chances so I replaced it. Now, I wonder if I miss diagnosed it and the fuel PRV may have been the culprit. Change out or re adjust it? Experienced advice is greatly appreciated. Thx in advance!
drop in pressure could be from a clogged line pinched hose, or clogged filter also. junk in the gas tank (like an old rag) could glog the outlet also, then move around and not glog it latter.
then again, a bad pump may intermitantly loss pressure (maybe dirt in pump?)
do you constantly have a pressure gage to read the pressure? if so, i'd keep running it and see if you experience a drop again.
idrt in a regulator could also cuase intermittant pressure changes but i would think it would result in a high pressure not a low pressure (dirt preventing the port to close enough to regulate) if the diaphram was torn, the regulator would not self heal.
keep an eye on it for a while and see if the problem is gone or not. at this point I would not start swaping any more parts until your sure it is still bad. if still bad start with the filter and looking for pinched hoses under the tank as that is easy and cheap to fix,