Was out cruzin the jag last night , not long finished fitting the new mina gallery cold air intake devider kit, and had my elm327 running and was watching
My dash on dash command (app) mainly to see temp related gauges, and noticed the fuel pressure was stuck at 57-58psi all the time ! I gave it some hard pulls in high gears WOT right round to rev limiter but stayed the same ! I'm sure I've read that above 4000rpm At WOT
Will trigger a second fuel pump with substantially higher pressure ? Is mine broken !
Bloody thing still goes like crazy! But did notice a small flat spot wile pressing the throttle down past 3/4 above 3000rpm witch I think is new !
And was running above 15.6 on the air fuel ratio most of the time , all my other cars run between 13-14 , is there a test prosedure to test the secondery fuel pump Wilst parked at workshop , or can this only be done on the fly ?
Would love some input on this one thanks guys !

 

ok sorry for the wast of thread space ! i should have thought to try a different scanner or app,
so i plugged in the icarsoft i930 went to graphs and chose a few random sensors to watch inc fuel rail pressure and tp , blow and behold there were two very different fuel pressures at the rail depending tp . as shown in the pic .
sorry for the false alarm.

 

Dead fuel pump would show pressure drop at WOT