After i turn my car off, my fuel pressure drops to zero within 2 minutes. In the past my cars have held their fuel pressure for at least a day before they dropped at all. I'm not leaking fuel anywhere. It's an AEM fuel rail with an AEM FPR, and a B&M gauge. If air was getting in somewhere would fuel pressure drop. Actually, if air was getting in somewhere, i would assume the fuel would leak out.
Does anyone else have an issue with this, or is it just something that some cars do?

Also, when i turn the key to "on" the fuel pump cuts on and the gauge reads correctly, then just drops. The only way i can adjust fuel is with the car actually running. It only holds a number at that point.

Thanks

 

I don't think that's a problem. The FPR lets fuel slowly back into the tank. As long as it holds the proper pressure while the engine's running it's OK. Just make sure it's not leaking OUT somewhere. You'd probably smell it if it were leaking.

When you turn the key 'on' the fuel pump only runs for about 2 seconds. If the ECM doesn't see a tachometer signal from the distributor by then, it shuts off the fuel pump. I think that's some kind of safety feature in case you're in a collision.