Just installed an external fuel pressure regulator into my return line. I have 03 silverado which comes with return style and has the stock FPR in the fuel rail. I got a bypass plug so i removed the stock FPR and replaced it with the plug. then i plumbed in the FPR into the return line and put stuck a pressure gauge directly on the FPR . At the same time I have a gauge connected to the rail fitting to monitor the rail pressure. Since I bypassed the stock FPR i would think that the rail pressure would be the same as what is displayed on the regulator? maybe the new gauge I just got that is on the regulator is bad? any ideas? the gauge that i have connected to my rail picked up about 55 with the stock regulator a few months ago so i know that was working at that time ...

this is with the truck running , you can see its about 45psi ( i did not get gauge that was on the rail but it was showing 58 )





what do you think?
_Zblee

 

unplugged the vacuum line and the pressure on the regulator went up. adjusted it to 58psi on the regulator and plugged the vacuum back in . rail pressure at idle is around 58~60psi now so i think i answered my own question and should be good to go!

_Zblee

 

Is that big line your reference line? Why the overkill?

 

the store didnt have anything smaller than -4 haha. for some reason i had a hard time trying to figure out what type of hose to use. was going to use some push to connect and all the lines i could find had low heat ratings so i did not want to risk it . this is earls pro lite ultra and it is rated to 300F and it matches the other hoses and no need for clamps now

_zblee

 

Did you eliminate the regulator on the factory rails?

 

yeah , in the picture you can see the bypass plug that is used. fuel is now only being regulated by the external regulator i just installed.