Fuel Pressure dropping at 5500 RPM?
I recently had a positive displacement supercharger installed on my 2013 Mustang GT and there seems to be an issue with my fuel system we are trying to figure out. I am not complaining about the kit or the installer. Just trying to help figure out how to solve the issues while having it dyno tuned with an HP Tuner.
It is a DOB phase III kit with a VMP Gen II supercharger that came with 52 lb injectors. I also had a JLT 123 mm Big CAI upgrade, VMP boost a pump, and FRPP twin 65mm cobra jet throttle body installed.
When tuning I was told that the fuel pressure was good but the engine was running out of injectors so I had 72 lb injectors installed. When tuning with new injectors the fuel pressure was dropping about 15 psi beginning at approximately 5500 RPM so I had another OEM fuel pump installed and the issue still exists. All the fuel lines have been checked for obstruction and voltage checked at the pump is 18 Volts.
Any suggestions on what might solve the problem or what to check next?
Thanks in advance.
2013 GT, Track Pack
, Recaros, Kooks Axlebacks, Airaid CAI, BMR Rear Adj. LCAs, BMR Relocation Brackets
, JLT Oil Separator(s), Barton 2 Post Shifter Bracket
, Steeda Motor Mounts
, Barton Shifter
, JHR Clutch line, BMR adj. UCA and Mount, Kooks 1 3/4 headers/catted H, DSS Al Shaft
, BMR Loop
, Vogtland Sport Springs front/BMR rear, Strange Adj. Struts/Shocks, Extended ball joints, Steeda Bumpsteer Kit, Whiteline Tranny Mount Bushing, Borla Overaxles, BMR Watts, Vorshlag 3" Ducts