Fuel Pressure Drop 99 GT

OneSick99GT

Active Member
Nov 20, 2018
364
47
38
Dayton, Ohio
Let me first list my mods because my car is far from stock. BTW my mustang is a returnless fuel system, which also means NO regulator. No codes either.

Forged Internals "pistons, rods and crank"
Compression 10.8
Bored .020
Trickflow Twisted heads "ported"
Typhoon Intake"ported"
Stage 3 comp cams
47lb Ford racing injectors
Eldelbrock fuel rails
Cold Air intake
Plenum and Throttle body
260 lph SVT Ford Focus pump

I literally have less than 300 miles on vehicle and just got it back from the rebuilder.

The datalog is attached for viewing. I've struggled to get everything perfect since I believe my fuel pump might be going out. Its a newer pump but the issue remains. Pump probably has less than 1k miles.

Problem
: Bucks when WOT between 2nd and 3rd gear.
Pulls strong any other time and pressure remains constant in any other gear.

FRP drops to 8 from 38/40 when the issue arises.
FPDC drops to .05 from average of 24

Again datalog is attached. The issue arise's at 3 minutes 28 seconds in the log. I haven't checked anything yet and wanted solid advice before starting my troubleshooting. I would love to know what setup I should use or others are using for a fuel pump on a returnless system.
 

Attachments

  • datalog4 STFT Cut Out Issue.zip
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