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Message: [QUOTE="lincolnlocker, post: 611689, member: 944"] 65 psi is the ideal pressure for optimum performance. but it still should NOT drop any pressure what so ever... op, your filter is fine... i think that is the cross reference to the baldwin bf1212 that most sell with there pre pump kits. i ran the frx for a couple years until this past summer when i thought i had some problems... i changed my pump out with a new one, didnt help, took the frx out of the equation, didnt help.... added a pre pump filter and a carter high flow low pressure pump, 5/8 pickup tube and 1/2 inch lines from tank to pump, didnt help, bought a aeromotive regulator to bypass the stock fuel pressure regulator, and WALA!! holds rock solid at 65 psi with no drop what so ever.. i took the frx apart and ran those liines to the aero regulator, plugged one hole on the frx block and drilled it out so it would flow better and ran the return from the bottom of the aero reg to the frx for the return line and blocked off the stock fuel pressure reg.... since that was the fix i tore into the stock fuel regulator to see what the deal was, turns out that there are more o rings inside it then what i knew about... and sure as chit one of the internal o rings where tore... i would check that first, and check it closely because the slightest little tare will hinder it... they sell rebuild kits for it... im not saying that is the problem but try that as thats the cheapest fix first and proly after that you can replace your pump.. riffraff diesel has the cheapest price for the stock bosch pump at 145$ so i would do that after i checked the fpr o rings... i am not sure if riffraff or any other vendor sells that rebuild kit or not but i am sure dieselorings.com does. please try this stuff first before doing anything else... like i said 65psi shouldnt be a problem at all with your setup.. jay, its been proven on the dyno that under 65 psi hinders performance.. you are correct that it will not hurt the injectors unless psi drops below 17 psi and the plunger contacts and bottoms out in the injector. thats straight from casserly himself.... but you can do what you want though! it may also matter where your taking your psi reading from... if its 50 psi at the fuel bowl, is it still the same at the injectors... in a ideal setup thats not dropping psi will measure the same at the fuel bowl that it will at the regulated return regulator... that way you know exactly what its doing.... i also did that with my setup just out of curiosity and when the psi was dropping it was worse coming out of the heads.. also would like to add that before i started messing withh all this crap that i had a bone stock fuel system with only a walbro and it held solid at 65psi even at wot.... but i got a bunch of chit in my tank and it trashed the pump... thats when i started to change things.. live life full throttle [/QUOTE]