This is excellent advice. If your fuel filter head is shot, an in-tank pump won't fix it. Don't get me wrong: installing the in-tank pump later would still be a good move, but it's really worth tackling one thing at a time so that you've got a better idea of where the problems likely are.

BTW: my in-tank lift pump installation showed up a leak in the fuel filter head (which was the revised design) that was letting air in. The diaphragm for the primer pump had failed; without the in-tank pump, it would just suck air, but with the in-tank pump it would actually leak diesel.

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2005 KJ CRD Limited 4x4:
245/75R16 BFG TA KO2s
OME / Clevis 2.5" Lift
JBA Lifted A-Arms
IRO WJ Short Rear UCA/WWDiesel mount
Skid Row Skidplates
HDS Model 001 Thermostat (190°F)
Suncoast TC
Full Weeks Kit
Bosch 5V glow plugs
Hayden 2986 fan clutch / GM 11-blade fan
Samco / Sasquatch Intake Hoses
Carter in-tank pump
Provent 200
V6 Airbox