I just finished my ls/vtec build and it has a shitty idle and wants to stall at stop lights. When i finished the build i had two lines left on the firewall. One was capped and one was ran to my fpr return. On to the point, yesterday i changed out my stock fpr for a aem afpr and when i removed the return line it squirted fuel everywhere for atleast 15 seconds before running out of fuel and finally blowing a **** ton of air for another 15 seconds. Does that sound right?

 

Green is the line i ran the fpr return to and the red is the one i capped.

 

Yes, the line going to blow air. You just need to take off the fill gas cap to let the pressure out, before start working.

The other is the vent line no matter is caped.