If you live near Pittsburgh, I would be more than happy to change that pump for you on a weekend. It takes around 3 hours and all I would charge is a case of Guniess.
You can buy that MOPAR filter from Cummins (and get it in the original Fleetguard box, the same filter but reboxed for Dodge) for around $15. It takes less than 5min to change.
On your 98. 5, if you have not changed the fuel connecting tubes, when you remove the fuel lines for the first time, the tubes MUST be changed. Dodge will not tell you this, they will expect you to come back when the fuel lines leak so they can charge you for another diagnosis and then rip you off on $85 worth of fuel tubes (the dealer will probably charge $85 for each tube, when you can purchase the new style for the price of one).
When removing the pump, just be sure that the motor is 0deg off TDC on #1 and be careful when removing the pump and the key will not fall out. You can also go to a Cummins dealer today and pick up a recon pump for $1450. There are also sources around here to get a pump for as low as $850.
Also, there is only 16k of FP when the engine is running, there is 0psi of FP when the engine is off. The system does not stay pressurized after turning off the engine. The solution to finding leaks with this high pressure, use a piece of cardboard and not your hand to find leaks.
Your dealer is RIPPING you off on mechanical parts and unless your time is that valuable, you should reconsider taking your work there.
Also, you should consider upgrading your fuel supply system. At the age of your truck, and judging that you had it mantained by a Dodge dealer, the lift pump is either dead or dying. I would suggest upgrading it to a FASS based solution. It will aid in increasing the life expectancy of the VP44.
-Rich