Just joined the forum, have been reading but now I have my own issue to solve. Just bought a non running Mercury Grand marquis, has 74k miles but does not start/stay running. Previous owner said he drove it daily until it started giving him issues and shut off one day. He said it seemed fuel delivery related so he got the fuel pump replaced. When the problem wasn’t fixed, the car was parked. It’s been there for id say 4 months or so. The gas still smells good. I’ve heard ignition switches are common problems, so I replaced that. Also got a new a battery for it. Upon trying to start it the first time, cranks but doesn’t fire. Got out and saw gas all over the floor, realized the fuel pressure regulator was missing. I found it and reinstalled. With the regulator on, I could get the car to run maybe 5 seconds, just kinda sputters and dies. After trying to prime the fuel pump a few times by turning the key, the regulator itself was blown out of the fuel rail and spewed gas everywhere. This happened more than once. I’m wondering if I’m putting the regulator in incorrectly? Could the regulator itself be faulty? My local Napa store says they’ve only sold 1 of these within the last 1.5 years at all 33 stores near me.. doesn’t seem too common. Any suggestions would be appreciated. Thanks y’all.