Adjusting fuel pressure with a FPR. Gota question

[-DSM2NR-]

Just got done installng my Fuel Pressure Regulator and I had a question. Should I adjust the fuel pressure with the vacuum hose connected or not? I've noticed that with the vacuum hose connected, and the car running the fuel pressure drops quiet a few pounds. So, should I adjust fuel pressure with or without the vacuum hose connected?

 

[Black Majik]

disconnect hose and close off the end of the hose itself(put your thumb over it) then set it. After it is set, reconnect the hose and the pressure will drop down.

 

[-DSM2NR-]

when the pressure drops should I adjust it again or leave it the way it is?

 

[Auto RS T]

Once you set the fuel pressure with the line disconnected and capped, it is set. Put the line back on, fuel pressure will drop and you are done. The pressure is set with the line off, so you would leave it alone after reconnecting.

 

[-DSM2NR-]

ok, thanks

 

[Black Majik]

Once you set the fuel pressure with the line disconnected and capped, it is set. Put the line back on, fuel pressure will drop and you are done. The pressure is set with the line off, so you would leave it alone after reconnecting.

Yes, this post is correct.

 

[Austin06]

Found this thread on a search, I was wondering the same about the setting the fpr thing, good answer.
But my question is, what would be a 'ideal' fuel pressure to set with the vaccum line removed, before reconnecting? or is it goning to differ from the setup your running?
Thanks.

 

[romeen]

Found this thread on a search, I was wondering the same about the setting the fpr thing, good answer.
But my question is, what would be a 'ideal' fuel pressure to set with the vaccum line removed, before reconnecting? or is it goning to differ from the setup your running?
Thanks.

Base fuel pressure for a 1G is 37 psi. It does not change regardless of your setup. So disconnect the vacuum line to the FPS and cap the end. Adjust fp to 37 psi. Reconnect vacuum line. The fuel pressure will drop relative to how much vacuum you have at idle (it drops 1 psi for every 2inHg). This is normal and expected. You are done.