im in with thermorex rockers they are fine move to next step

I replaced the fuel head recently and assumed it should be OK. I last primed the system 4 days ago. However as suggested I checked and there was in fact air in the system. I primed it again but the sound is still there. I will have to get clear tubing installed on the fuel head so I can see what is happening. I just drove 1800km in 2 days and no problems encountered except for the strange sound. I can also confirm that the rattle sound definetely only occurs when engine warm. When cold everything is fine.

hmm, I guess the leaking seam expands when it's warmer. Sure does sound like my air sucker.
Maybe the quick connect at the tank is sucking just the right amount of air

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05 CRD: H.D.S2 stat,WW Ironrock trilink&LCA's, OX rear,ARB front, 4.10's, ARB bumper, Suncoast,OME 3.5, JBA UCA,rock rails, Moabs&265/75 Duratracs, GDE tunes ,FFD fan,ARP's, 2 micron fuel, new valves,sasquatch battery tray & grid heater, tensioner relocated
Mech fan, VH & AC delete

I recommend a lift pump. The issues will surface more as these vehicles get older. A lift pump can hide the issue for quite a while

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2006 Jeep Liberty CRD 142,000 miles New engine 2-2014, Green Eco tune, FS2500 bypass filter Weeks elbow, European Torque converter, brakes front UCA's wheel bearing and front hubs. Front hitch OEM lift pump
98 K2500 Suburban 6.5td
96 K1500 " 6.5td
95 2 door Tahoe 6.5td
94 K3500 cc srw 5 speed 6.5td
91 International Model 6 speed spicer 4700