Well, I probably should've asked this question a long time ago.. A while back (about 18k miles ago) a friend and I were replacing my alternator after it went out.. In the process of removing the alternator he accidentally bumped into this piece mounted on the intake manifold and broke the nipple off on the bottom side (pics below). I guess it is a sensor or something but it is the one that is held on by a gold bracket directly on the side of the intake manifold and the line going from the FPR runs straight to the it..

It is _NOT_ the nipple and line you can clearly see circled in the picture, it is the under side of that piece..



The nipple I'm talking about is the one that the circled line (in the pic below) runs to.. I took the piece completely off and it actually has two nipples on it.. Of course one was broke and the other was capped off by a black cap with a Mitsubishi emblem on it.. From looking at the piece it seemed obvious to me that I could uncap the one nipple and plug my hose in there and just put some plastic epoxy over the broken nipple to seal it's hole off..





Like I said the car has been like this for several thousand miles so I'm pretty sure it hasn't affected anything but I am kind of curious to the function of this piece.. Any input is appreciated, thanks!!

Also, sorry if my post is hard to understand.. Let me know if I need to clarify anything..

 

With that broken off you will not increase fuel pressure under load. What you can do is the line that goes into the sensor, take it off and put it directly into the fuel pressure regulator (the gold colored thing at the end of the fuel rail). So the vacumme line would go from the intake manifold directly to the fuel pressure regulator. To my understanding when you start the car this seleniod closes so you have about 3-4 more PSI of fuel at start up. It is not really needed, I took them out of my 1G and 2G along with all the emissions crap. I am sure someone on here has take theres off and you can buy one for a couple bucks.

 

Ok I'm a bit confused somewhere.. What is the thing circled in the second pic with the hose running off of it? I thought that was the FPR.. From how I'm interpreting your post I think you may be looking at the wrong hose, but I may just be confused.. It's _NOT_ the hose circled in the first pic that is on top and in plain sight.. It is directly under that like on the back side of the circled piece.. You can feel where the line runs to it but you can't really see it..

 

Also, if someone could possibly tell me the name of that piece it would help greatly.. That way I can just buy a new one and be done with it..

 

I am confused by the 1st pic, the second one is the line to the FPR. There is a line going form the manifold to the sensor and a line from the sensor to the FPR. Is it either of those lines. No offense but your pics are not very good. That sensor in-between raises fuel pressure at start up to my knowledge.

 

Lol, none taken.. Those actually aren't my pics at all, I borrowed them off of a boost gauge install write up just a moment ago..

Ok, it is the line going from the sensor to the FPR then.. The top line (first pic, circled) goes from the sensor to the manifold.. Under that line there is a plastic thing (sensor I guess) and coming off of it was a nipple with the hose going to the FPR (circled in the 2nd pic).. That is the nipple that broke off, BUT when I removed the entire sensor piece there was another nipple on the bottom side that was merely capped off with a black, plastic Mitsu piece.. I uncapped it and just swapped the line to that nipple since it is still on the same side and sealed up the broken one..

 

Well the line to the FPR can just come off of the intake manifold. You don't really need that plastic sensor crap. I have no idea what the part is called. As for where you have it now I have no idea what that port does. You need to make sure the FPR is seeing boost because it is how you raise your fuel pressure under load. I don't know how much you know about cars so sorry if I make you sound like a dumb a$$. I am trying to give you as much knowledge as I can.

BTW: WHITE ROCKS!, lol I have a White 03

 

That solenoid is used to control the pressure signal to the FPR and is used to induce fuel cut and other electronic functions related to fueling.

You'd be best served to leave it connected and plumbed into the system as is.

 

I never knew it was used to induce fuel cut? That is a new one to me. Well then, I guess for some people it is important. Do you know what the other port he has it hooked up to now is. He needs to make sure he is still getting pressure and vacumee to the FPR.

 

or simply by pass it

 

Lol, don't worry I don't feel dumb at all.. Your posts at the first were just a bit hard to understand, as I'm sure mine were as well.. Thanks for all of your help though!

 

Mike, thanks for the input! I'm planning on just leaving it the way it is, as like I said it's been this way for 18,000+ miles.. I just thought about it and got curious as to what the piece actually did and decided to educate myself further..

 

It's hard to explain if you've never actually had the piece off, but simple as can be if you're looking at it.. I wish I had some pics so I could describe it better.. On the bottom there was the nipple where it was originally connected, a inch or so down the plastic piece was another nipple pointing in a different direction and capped off by a plastic piece.. I sealed off the broke one, took the cap off the other one pointing the opposite direction, and plugged my hose into it..

My thinking was essentially that if before it had the line going in and a blocked off nipple to the left, then there couldn't be much difference if it was going into the other nipple with the one on the right blocked off.. Sorry like I said it's hard to explain..

 

I never looked to see where the thing is on my car but I think you guys are talking about the Fuel Pressure Solenoid. What the Fuel Pressure Solenoid does is open and vent the Fuel Pressure Regulator to atmosphere when the engine is hot.

This is a bandaid fix to the hot start problem (vapor in the fuel line). My experience with DSM's, which also had the FPS, is that it doesn't do much. Therefore, it was frequently bypassed.

 

So are there any adverse effects to running it like I have it now?