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Reply to "Fuel pressure ok?"

The only eight stack EFI system that I worked on had a vacuum chamber that was being fed by lines that came off of each throttle body. It allowed for a constant and stable vacuum reading. I agree that the photo of the fuel pressure regulator does seem to have a small line on the right side which looks more like a vacuum sensing line than a fuel return line. The aftermarket fuel injection system that I am using in my Pantera is a FAST XFI 2.05 and it has a rather large fuel return line that comes off of the pressure regulator and goes back to the gas tank. The fuel pump pressure stays the same at all  times. I have watched it from the ECU on the dash monitor and my in dash fuel pressure gauge. There is also a mechanical fuel pressure gauge that is on my fuel pressure regulator. It sounds like over kill on my system, but I already had an in dash fuel pressure gauge in my car before I switched it over to fuel injection, so I just replaced the gauge with one that worked with the higher fuel pressure that EFI has. Many newer factory EFI systems use a variable pressure fuel pump which does change fuel pressure according to load. I also agree with just starting to look at simple things on this system, but the best approach is to start with getting any fault codes that are coming up in the ECU. That of course means hooking it up to a laptop with the correct software program. This entire problem could still just be a batch of old gas that needs to purged out of the system. The simplest way to do that is just get the car out and drive it like you stole it until it clears itself out!

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