checking fuel pressure how?

[4gfun]

Sorry if I couldn't find the results that I was looking for by searching.

I have an aftermarket inline fuel pressure gauge installed.

I really just need to know whether or not I am supposed to check fuel pressure with the vacuum line to the regulator disconnected and capped off, or with it on.

At any rate, the fuel pressure is obviously set too high.

Results were:

48 psi with line connected and 57 psi with it disconnected.

(Previous owner probably bumped up fuel pressure to try and get away with running 450's on a Big 16g)

Thank you for your time.

 

[99gst_racer]

Read the last half of the first post: http://www.dsmtuners.com/forums/fre...ommand-flo-fuel-modifier-other-afpr-faqs.html

Check fuel pressure with the vac. line disconnected.

Yes, that is set high. What type of regulator is it?

 

[4gfun]

Thanks for pointing that out.

It is an "SX" AFPR.