Originally Posted by simpsonsdotcom
So last night I ordered an ignition coil from Rockford auto. I used a coupon from www.retailmenot.com
thanks oOIIJoshIIOo! Got it for $57 shipped!
I also ordered a fuel pressure gauge. What psi should i be expecting?
If you take the vac line from the Fuel pressure regulator off of the intake manifold, it should be a constant pressure ~43-ish psi.
With that vac line attached to the FPR it will "add" the intake manifold pressure (in gauge psi, not absolute psi) to that 43-ish psi. That should give you ~43 + (pressure in psig... which will be a negative number at idle
Typical EJ20 vac @ 750 RPM idle is around 17-18 in Hg, which is around -8 to -9 psig, so idle fuel pressure should be just under 35ish psi.
Obviously it's easiest to check and verify by popping that vac line off the intake manifold, since it should be a constant value just under 45 psi.