on a healthy truck the bulb could could get hard enough that it would take Popeye arms to continue pushing it down. fairly stiff sounds good.

injectors can fail in more then one way. failure on the injection side typically results in bad balance rates. failure on the return fuel side results in hard start conditions.

i would test the return rates before jumping into buying injectors.
LB7 Fuel System Diagnosis - High Pressure Side

Well after day of not working on truck went back same old very hard to start after sitting a period of time with no codes
Truck has a very small amount of white smoke at start up only and there for after will run great until it sits again
So l replaced all the gaskets in prime pump/filter l keep thinking it is getting air somewhere
Drained oil no fuel in there Did air preasur test at tank nothing visable
Same hard start after sitting overnight
I have a hard time believing injectors are causing this issue and if so why would it be after sitting over night only?
-Temp out side is 40 F
-numbers in drive with foot on break idling
1 -4.1
2 -1.2
3-2.2
4 2.0
5 -5.2
6 4.3
7 -1.7
8 8.4
- with the tech 2, max fuel Mpa
Actual 5644.8 psi
Disired 5655.0 psi
So my next step is replace fuel prime housing and two lines going from it any thoughts

i have a 2002 3500 lb7 and it did the samething and it wont even start anymore

I bought a fuel filter housing rebuild kit from US Diesel and it helped quite a bit but didn't solve it, I have the same problem you are talking about

same problem here, but the filter rebuild kit got me going again.