Multiple fuel pump models? 03 2500 5.7 - are they all the same?

[SavedByGrace]

broke down in traffic 2 days ago after a 400 mile round trip to the desert! verified fuel pump not happening!

Been scouring rockauto for a pump (bosch or delphi brand only).. im seeing different variations in part numbers but they all look identical between engine sizes and similar years..

Bosch has 2 numbers for different wheelbases but delphi has one pump for both!!

what gives?

DELPHI FG0817 for smaller CID but looks the same? (someone has a delphi new in box nearby)

Rockauto has various options:

 

[SavedByGrace]

1/4 tank but pump was making a noise varying alot in sound - going up and down in pitch alot (i hotwired it and listened. Also tapped pump, swapped relays, checked fuse, no codes). Just air coming out of shrader which i would say is from engine heat buuklding pressure in the rail,

 

[kevkev]

The different model numbers are based on tank size probably. You have to have the correct sending unit for your tank size. 26 gallon, 34 gallon, 36