This might help someone. When I put springs on my car 2 weeks ago I got that. I re-installed the springs and still got it. Finally I found that the fuel fill pipe was kind of loose down there. I guess with the stock springs it didn't jar it enough to make it hit but the stiffer springs did. It is just plastic so I put a zip tie around it and the plastic liner it runs next to and held it in place...no more knock!
Hope this helps.
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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