My car has been running really rich so I took it to a shop. No codes came up so he started looking around and pulled the vacum line off my fuel pressure regulator and gas was on the inside, so he said it ws busted and gas was going though my vacum line into the intake causing it to run rich. SO he said get a new one and a new map sensor. What is the map sensor for and why do I need a new one? Also is an adjustable FPR worth the extra money with just the basic bolt ons done?

 

If you have fuel in the vacuum compensation line, you have a torn diaphragm in the pressure regulator. Your engine will run poorly because of the fuel being pulled into the intake through the vacuum line, and your engine will also run poorly because the pressure regulator con't keep the pressure at the correct value.

An "adjustable" FPR is of no value at all, unless you have decided to run your fuel system at a higher pressure, to increase the flow capacity of the injectors.... AND you have adjusted the injector flow constant in the PCM to reflect that increased flow cpability. Playinhg with fuel pressure is not the way to tune an engine, and the PCM will negate your changes by adjusting pulse width.

Not sure why he would say you needed MAP sensor, just because your FPR was leaking. Did he put a scanner on the PCM and find a code for MAP? The manifold absolute pressure sensor (think of it as the opposite of the vacuum measurement) is one of the most critical items on the engine, since the ignition timing and many other PCM parameters are tied to MAP. MAP is a measure of engine load. If he did a scan, and got a code, or looked at the scanner and saw that then sensor was putting out bad numbers, replace it. But if he's just thinking somehow its tied to the FPR leak, or that it screwing up the engine for some reason, replacing it would not seem to be necessary.

 

Thanks great info and no no codes ever came up he just said to replace it for some reason.