New Knock / Suspecting Fueling Issues

[Aso544]

Getting some new knock at top end of WOT runs. Just appeared. Feel I’m leaning out up top and suspecting a possible fuel feeding problem. I adjusted boost down to 15 from 19 and it still present. Looking for some advice. My fuel pressure according my fuel rail gauge is 25 at idle and 30 with key on. The car has a Hotwire mod done as well.

1. Where and how do I attach a external Fuel Pressure Gauge to see what it’s doing under power.

2. I seem to have a modified Bosch FPR but not sure how to adjust it to see if I can bring up thE FP.

3. Possibly looking at needing a new Fuel Pump as this one is pretty old.

Any suggestions will be appreciated.
Akm

 

[Mr.Spool]

Any suggestions will be appreciated.
Akm

verify fuel pressure rise 1to1.need to see it in real time.buying parts is just a guess you need data

 

[Chuck Leeper]

Idle psi w/ line on, or off?
In any case, the psi should be set to 43, line off, engine warmed up.
Lots of choices for pumps, Walbro, Deutchworks, etc.
Voltage at the pump is?
FPR adjust = loosen the jam nut, turn the screw in til the desired psi is read, lock the nut.....
Any data log info available? Difficult to help, w/o some good data.

 

[Clark6]

yes my recent problem like this was the Ground wires back to the gas tank was corroded. Also missed a ground back at the ECM for the fp relay. I added 2 grounds one to the gas tank one coming off the plug for the fp going into the gas tank. Supra pump still goin.