Well my fuel pump is a 255 on a relay and switch, stock fpr and rails. I see about 39-40 psi at idle. If i remove the vac line it stays the same. If I rev it up the pressure goes down. In idle I guess i really dont make much boost to increase my pressure but should it go down? It doesnt make sense that it reacts the same without the vac line. Has anyone had a problem running their FPR off the same vac line and port as their pressure sensor and blow off valve. I only use one port and T everything for the different valves + sensors?

 

Fuel pressure should follow MAP.
Lowest at ~2K with no load. Highest under full boost.

Last spring, my stock FPR seemed to stick on low, but before I got an aftermarket FPR installed, it came unstuck all by itself!

The single line seems like a good idea.
If it comes off, the boost gauge will tell you.

If you want an aftermarket FPR, I still have the new one I never used. $35 shipped.



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