What diameter is the tube coming from the fuel tank sending unit? Is it 3/8 or 5/16 diameter? Also, check your fuel pump pushrod. Just had same issue on customers 440 GTX. The pushrod was wearing down.....

68 Cuda Notchback [Email]10.86@120[/Email] 69 Charger R/T 440/505 2009 Challenger SRT8