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Here are the logs if it helps. First 2 pics are for MAF, AFR, and Fuel Trim readings. 1st pic being cruising and 2nd pic during WOT. Last 2 pics are for fuel pump pressure. 1st pic being cruising and 2nd pic during WOT.

I’ve replaced the fuel pump twice. The whole pump assembly is perfectly fine, no issues there. Permanent clamps that were provided by Deatschwerks in the installation kit for the DW400.

I positioned the sock properly before putting it in and I didn’t snip the tabs like most people do. The fuel pump doesn’t bottom. The fuel pressure when under 5300RPM’s hold a consistent pressure of 84-86.

DW is just as confused as we all are. Everyone’s response has been “that’s odd” and “check the fuel lines, test the fuel pump, check your ground wires, check for good voltage”. After I’ve told them I have done all that they basically run out of possible solutions for my problem.

Toby’s solution was a Fore Innovation return style fuel pump assembly for his boosted car. I have a basic bolt on 19’ gen 3. I shouldn’t have to drop a whole lot of money for a return style system for a NA car to run a 100%.

Tuner is Lund. They actually have someone else dealing with the same problem and we are all trying to troubleshoot it. Being that they have tuned thousands of cars NA/Boosted equipped with DW400 pumps and have had no issues, I have a hard time believing it’s the tune.

Fuel injectors were tested and had no faults whatsoever during the process. Lund is saying it has nothing to do with Fuel Injectors. I’ve heard of 3-4 other people with similar issues. They either ignored it, blamed the tune, or still trying to find a solution.

Based off the datalogs my voltage is as good as ice cream on a hot summer day. The battery is perfectly fine. I couldn’t tell you how old it is I just know it’s doing it’s job.

Deatschwerks already supplies the correct sock for the specified fuel pump, DW400 w/ 1047 installation kit. It’s a perfect fit. I’ve even tried raising the fuel pump a little so that the sock isn’t possibly causing any restriction when sitting flat at the very bottom of the hat.

The low fuel pressure issue started with the stock fuel pump. That’s the only reason why I replaced it with a bigger pump.

Fuel pump driver module was replaced and voltage at the FPDM and pump are good.

2019 Mustang GT (14K Miles) CAI, Headers, E85, Lund Tune Stock Injectors Stock Manifold DW400 Fuel Pump Stock fuel pump was replaced due to failing. Replaced it with a DW400 and ran into low fuel pressure issues at WOT. Assuming it was a faulty fuel pump, I replaced it AGAIN and problem still...