How do you check your fuel pressure?

[newdude1]

K so Im trying to figure out a few things before I send my ecu back off to jwt and one thing I wanted to check was the fuel pressure. Because its suppose to be at 43.5 and my electronic gauge is saying 38 psi. I think I heard you can tap a T unit in the vac line from the fpr. Is this correct? Im using a Vacuum gauge to check it.

[bruinbear714]

K so Im trying to figure out a few things before I send my ecu back off to jwt and one thing I wanted to check was the fuel pressure. Because its suppose to be at 43.5 and my electronic gauge is saying 38 psi. I think I heard you can tap a T unit in the vac line from the fpr. Is this correct? Im using a Vacuum gauge to check it.

IIRC, its around 43-44psi at WOT and 38ish at idle assuming you have a stock FPR.

[newdude1]

Well I just called jwt and they told me at idle its tuned for 43.5 and my car is extremely lean at idle. and I know it doesn't go above 40 on my gauge at wot. But can I check the pressure by tapping into the vacuum line to the fpr?

[Justin35ll]

No you'll only get a boost/vacuum reading there.

[USMCgetsome]

hey new dude you might have to interest yourself in a digital fuel pressure gauge that you can put in the cabin