So this car will crank but not start, right? Have you scanned for codes? The TPS sensor on an OBDII ABA is inside the throttle body unit and not serviceable separately, what exactly did you do with it? Did you do a throttle body adaptation with VCDS after messing with it? Please advise.
If you suspect a fuel supply problem, stop swapping parts and do the testing. Check for power and ground directly at the fuel pump. If you've got power there while cranking, use a mechanical gauge to check fuel pressure at the rail. Post up the results.