Quote:
Now...how in hell did adding the CAT filter cause the injection pump to fail???
It didn't. No more than it causes CAT diesel engines to fail.
Look logically at what's happened so far:
You have a problem, immediately after altering the fuel filter head.
You take it to a dealer
Dealer tech jumps at multiple symptoms that
could be responsible for any diesel engine not working:
lack of injection due to bad timing sensor
lack of pump pressure
lack of good troubleshooting skills
Dealership is desperate to reach next step, has already invested their time without possibility of generating revenue
You already sense dealer tech doesn't know what he/she is doing. They probably suspect that you realize their weakness.
Something has to be done. Suddenly, a problem is identified that generates lots of revenue for the dealer, at your expense and gets the dealer and his unskilled tech off the hook trying to convince Chrysler to pay for warranty work. With a tech this poorly trained, it's a good bet that Chrysler has heard from them previously on other misdiagnosed warranty work. Their reputation with Chrysler is probably worse than it is with you by now. The path of least resistance points to you, the paying customer and that yellow scapegoat CAT filter hanging off the fuel head.
Now a pump is diagnosed as bad, because the CAT filter doesn't have a water drain on it and
could have let water pass through the pump and ruined it. How do you know this bumbling tech didn't run the pump dry in his effort to fix the problem and ruin the pump on his own, if indeed that is the problem? If you had enough water in the fuel to destroy that pump, you should have noticed some rough running, some white smoke, something to tell you that the fuel was contaminated. You indicated nothing to date that says prior to replacing the fuel filter that this was the case.
The only fault code you've posted so far is the Large Leak, which points to an air leak in the fuel system. What other codes did they pull to support the lack of high pressure fuel on the rail? If they can't support the claim with some fault codes, to use their own troubleshooting source of info, then don't accept it.
Suggestions:
Get the vehicle towed out of their shop asap, before something else "goes wrong" with it. If you're willing to work on it, tow it home.
Read the codes with a code reader, or if works on yours, from the odometer. Write them down. Remember that the last 2 digits are transposed, so correct for this bug. Then work the problem from that perspective. If nothing but a P0093 is there, start with the most likely area, the area you altered just before the problem started. The fuel head.
Also check the other easily determined problem areas - like the AFC/TCV valve in the air intake tube by pulling the CAC hose, using a flashlight and watching it while someone else attempts to start it. Eliminate that possible problem area first. Also check the fuel rail pressure connector and wiring, to be sure you didn't accidentally knock something loose while you were working on the fuel head area originally.
Decide whether you are willing to invest $150 USD for a new complete fuel head to completely exonerate the CAT filter system, with a possible air Large Leak in it. If so, order one online, connect the new one inline, without even removing the old filter from the vehicle, just to see if this solves the problem. Prime it well, then see if this works. If it does, you know more than your dealer tech. If it doesn't, check your fuel quality - pull a sample from the hose to the filter and vacuum some out, then inspect it. If it looks good, send a sample to be tested - you'll need this info to invalidate the dealer claim of fuel contamination. If the fuel sample checks good, your dealer's diagnosis just fell apart legally.
Those are some simple steps you can start with. At this point, convenience isn't on the menu - you are going to have to spend some time and money to get this resolved.
If you do find more codes, post them or look them up online to see if there is anything pointing to a high pressure pump failure.
Best wishes.