GWraith
Well-Known Member
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My 2021 Mustang GT with a Roush Supercharger Phase 2 recently had its ECU calibration updated. After that was done I started to hear this thumping, 3 of them, any time I would open the driver's door when it's been off for more than 5 min. Sometimes it even will occur if I'm just standing near the car with the key.
I originally thought it was the HPFP as it sounded like it was coming from the front right of the car. However, when I had my wife help me locate and video the sound we found it was coming from the driver-side gas tank area so in-tank fuel pump.
I consulted Roush and provided them videos of the noise and they said it should only do that if it's cold not every time.
I have no starting issues when hot and only slightly extended cranking when cold which is normal.
Going from the orginal calibration to Roush's new calibration it fixed the issues present on most supercharged Mustangs of the stumble start when the car is already to temp. This would happen if you went in to the store a few min then came out and started the car again. Its would start but stumble a little before eventually reaching stable idle.
My car is a push start, manual, base model. I upgraded the screen to 8" OEM and sound system speakers/amp. I have also made modifications consistent with the stereo upgrade in FORSCAN but have not touched anything fuel-related in there.
Roush is adamant that their calibration uses Ford's fuel strategy and they didn't modify anything and said I should take it in. They have since gone radio silent when I asked them to let me revert the calibration to the previous version to verify.
Previous to the calibration I never noticed it neither did my wife, she drives it most of the time to school.
Ford dealers in the Tampa area are absolute shit. They want you to leave your car with them for a week or more just to even look at it and most can't "fix" anything for weeks sometimes months out.
Just trying to gauge the community and see if this is seen in other cars across the forum or should I take this in as it may be something in the fuel system beginning to fail? It simply sounds like the fuel pump is priming 3 times and every time I go to use the car.
I should add I live in Florida and low temps is like 60F so not really cold by car standards.
Once the 3 year warranty is up on the Roush Supercharger Im going fully custom fuel system and E85 so as long as this pump lasts 3 years I can ignore it.
Here are multiple links to the video files:
Roush Folder
https://drive.google.com/drive/folders/1pEZLth_rKqW_krzZMTL-h2HI8RxJacY4?usp=sharing
Zip File w/ Both Videos:
Video 1 - MP4:
Video 2 - MP4:
I originally thought it was the HPFP as it sounded like it was coming from the front right of the car. However, when I had my wife help me locate and video the sound we found it was coming from the driver-side gas tank area so in-tank fuel pump.
I consulted Roush and provided them videos of the noise and they said it should only do that if it's cold not every time.
I have no starting issues when hot and only slightly extended cranking when cold which is normal.
Going from the orginal calibration to Roush's new calibration it fixed the issues present on most supercharged Mustangs of the stumble start when the car is already to temp. This would happen if you went in to the store a few min then came out and started the car again. Its would start but stumble a little before eventually reaching stable idle.
My car is a push start, manual, base model. I upgraded the screen to 8" OEM and sound system speakers/amp. I have also made modifications consistent with the stereo upgrade in FORSCAN but have not touched anything fuel-related in there.
Roush is adamant that their calibration uses Ford's fuel strategy and they didn't modify anything and said I should take it in. They have since gone radio silent when I asked them to let me revert the calibration to the previous version to verify.
Previous to the calibration I never noticed it neither did my wife, she drives it most of the time to school.
Ford dealers in the Tampa area are absolute shit. They want you to leave your car with them for a week or more just to even look at it and most can't "fix" anything for weeks sometimes months out.
Just trying to gauge the community and see if this is seen in other cars across the forum or should I take this in as it may be something in the fuel system beginning to fail? It simply sounds like the fuel pump is priming 3 times and every time I go to use the car.
I should add I live in Florida and low temps is like 60F so not really cold by car standards.
Once the 3 year warranty is up on the Roush Supercharger Im going fully custom fuel system and E85 so as long as this pump lasts 3 years I can ignore it.
Here are multiple links to the video files:
Roush Folder
https://drive.google.com/drive/folders/1pEZLth_rKqW_krzZMTL-h2HI8RxJacY4?usp=sharing
Zip File w/ Both Videos:
Video 1 - MP4:
Video 2 - MP4:
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