I installed a new injector this weekend and have been having trouble with the new return line leaking (different thread). It may be that the new injector leaks around the middle. Is this possible and would it cause nailing? The nailing started immediatly when the new injector was installed. Injector was off the shelf form MBParts.

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Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K