Like a month ago, my B&M Fuel Gauge broke. I was having some problemes with running the engine fine because it wasn't tuned right. I tried to up the pressure from the AEM FPR but didn't have a clue about the amount since I didn't have a working gauge. Today, I installed a brand new one. The Fuel pressure on the rail was at 80 I tried to lower it from the FPR but it doesn't go down somehow. If I tighten it, after a point it starts to go up from 80 but when I loosen it, it goes back to 80 and stays there... What might be the problem?? I took out my FMU myself, is it possible that I did something wrong with the hoses?? I used a plastic connector to connect the hoses. (I don't think it would have effect the fuel pressure)

 

if i'm correct AEM fuel pressure comes w/ different bolts to meet fuel pressure. make sure your using the correct bolt. also try using stock fpr to make sure the gauge is not broken again.

 

What fuel pump do you have? 255 lph high volume/high pressure? What NFR's talking about in the FPR is different size orifices so, you can divert more fuel back to the return line. This is a common problem when you put a large fuel pump on it and the factory FPR can't return enough fuel back to the tank.

I agree with NFR's experiments though. Factory FPR to see, then perhaps re-valve the AEM.