Fuel system
After doing a little research we discovered that the Jeep fuel system was only designed to operate at 49 psi, 6psi less than the PT Cruiser\SRT4 computer was used to. While 6psi might not sound like much it is over 12% and we knew that we would need to make significant tuning changes to overcome the difference. Both the Jeep and the PT GT use a combination fuel pressure regulator and filter that sits in the fuel canister so our original plan was to swap them. Upon even a quick glance it was obvious it would take more work to adapt the Jeep canister to the PT GT filter/regulator than it was worth. This one was pretty easy fix though, we used the same formula Nick used on his Neon SRT4. We started with a Walbro 255lph drop in pump. The first one we received lasted about as long as a popcorn fart but the second one has been going strong for a couple years now. The Jeep fuel canister suffers from the same bottleneck as the Neon and we used the same fix too. By adding some bulkhead fittings we were able to create our own -6AN inlet and return ports in the top of the canister. After cutting a piece of hose to just the right length to hold the pump in place and we were ready to put the tank back in. From the tank we used a couple of feet worth of flexible push lock hose to insulate the solid aluminum lines that ran the rest of the way up to the Aeromotive fuel pressure regulator. The jump from the regulator to the rail and the rail back to the return line utilize the same push lock hose and AN fittings we used from the fuel canister to the hard lines. Realistically we were going to have to upgrade the fuel system in order for us to get the most out of the bigger turbo but it wasn’t something we had originally planned to do before getting the Jeep back on the road.