Like the title says, should it stay hard? After I prime mine and run it, the pump feels soft. Usually it takes 3-4 pumps to make it hard again.

Please excuse any innuendos.

Yes, it should stay firm. Once you pump it are you loosening the bleeder and releasing air?

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2005 Crd Silver Limited- arps, rockers, 7v etechno's, egr deleted, v6 airbox, metal cac's. Yeti's stage 2 tune. Euro TC, Ram tcm, pml transmission pan, facet lift pump

If you want it to stay hard all the time, install a lift pump.
Remember, without a lift pump the fuel filter is under vacuum. You can manually pump it hard with the engine off but once you run the engine it will go soft again.

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U.S. Army Retired

When you pump, bleed, repeat to get rid of air it will go "really" hard. Once you start driving it will relax to "firm" and may take like 3 pumps to go really hard again. If you have a first gen head pop the heater plug, small one, insert "Q" tip; does "Q" tip smell like diesel; if so get 2n gen head.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Just had this issue so I packed the heater plug with that epoxy putty and it sealed it up nice while I waited for my Racor unit to come in.

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2006 CRD - GTB2056 turbo by Dieselguy86, Eco Trans Tune, Lift Pump, Week's, HDS Tstat, Racor Filter, ARP's, OME 790's+Top Plate, JBA 2.5", JBA UCA, Moab's+265/75R16, ARB Bull Bar, 4.10's, TrueTracs