What does this hose do?
Originally Posted by Autoxevo
Looking at the FPR the nipple is on the intake just to the right and down 2 inches away, the hose is only about 3 inches long.
OMFG I love the misleading information in this thread.
Varrius,
You have not provided enough information in your original post for anyone to actually comment on the situation. You need to go out to the car and look at the FPR on the end of the fuel rail. See if the vacuum hose is connected and tell me where it is going.
What most likely they have done is take the vacuum line from the manifold and connected it directly to the FPR. This is fine and will not hurt anything.
All that solenoid is for is cold start enrichment. The solenoid turns on on a cold start to prevent vacuum from going to the FPR. This raises the fuel pressure to 43 PSI to get more fuel in the engine when it's cold. Once the temperature hits a certain point this solenoid turns off and stays off.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
Varrius,
You have not provided enough information in your original post for anyone to actually comment on the situation. You need to go out to the car and look at the FPR on the end of the fuel rail. See if the vacuum hose is connected and tell me where it is going.
What most likely they have done is take the vacuum line from the manifold and connected it directly to the FPR. This is fine and will not hurt anything.
All that solenoid is for is cold start enrichment. The solenoid turns on on a cold start to prevent vacuum from going to the FPR. This raises the fuel pressure to 43 PSI to get more fuel in the engine when it's cold. Once the temperature hits a certain point this solenoid turns off and stays off.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
Originally Posted by timzcat
OMFG I love the misleading information in this thread.
Varrius,
You have not provided enough information in your original post for anyone to actually comment on the situation. You need to go out to the car and look at the FPR on the end of the fuel rail. See if the vacuum hose is connected and tell me where it is going.
What most likely they have done is take the vacuum line from the manifold and connected it directly to the FPR. This is fine and will not hurt anything.
All that solenoid is for is cold start enrichment. The solenoid turns on on a cold start to prevent vacuum from going to the FPR. This raises the fuel pressure to 43 PSI to get more fuel in the engine when it's cold. Once the temperature hits a certain point this solenoid turns off and stays off.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
Varrius,
You have not provided enough information in your original post for anyone to actually comment on the situation. You need to go out to the car and look at the FPR on the end of the fuel rail. See if the vacuum hose is connected and tell me where it is going.
What most likely they have done is take the vacuum line from the manifold and connected it directly to the FPR. This is fine and will not hurt anything.
All that solenoid is for is cold start enrichment. The solenoid turns on on a cold start to prevent vacuum from going to the FPR. This raises the fuel pressure to 43 PSI to get more fuel in the engine when it's cold. Once the temperature hits a certain point this solenoid turns off and stays off.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
Originally Posted by timzcat
OMFG I love the misleading information in this thread.
Varrius,
You have not provided enough information in your original post for anyone to actually comment on the situation. You need to go out to the car and look at the FPR on the end of the fuel rail. See if the vacuum hose is connected and tell me where it is going.
What most likely they have done is take the vacuum line from the manifold and connected it directly to the FPR. This is fine and will not hurt anything.
All that solenoid is for is cold start enrichment. The solenoid turns on on a cold start to prevent vacuum from going to the FPR. This raises the fuel pressure to 43 PSI to get more fuel in the engine when it's cold. Once the temperature hits a certain point this solenoid turns off and stays off.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
Varrius,
You have not provided enough information in your original post for anyone to actually comment on the situation. You need to go out to the car and look at the FPR on the end of the fuel rail. See if the vacuum hose is connected and tell me where it is going.
What most likely they have done is take the vacuum line from the manifold and connected it directly to the FPR. This is fine and will not hurt anything.
All that solenoid is for is cold start enrichment. The solenoid turns on on a cold start to prevent vacuum from going to the FPR. This raises the fuel pressure to 43 PSI to get more fuel in the engine when it's cold. Once the temperature hits a certain point this solenoid turns off and stays off.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
now if he MISINFORMED US, then what you say is ABSOLUTELY RIGHT. but the FACT is that he gave us a far away picture, not even zoomed in, and said, hey this is now disconnected.
trinydex,
The only information that was privided is that that hose was no longer there. Low and behold all the guy did was bypass the frp solenoid which is not uncommon.
He provided what he knew of the situation, being that he is not mechanically incline people should not jump to conclusions. It took 30 some odd posts for someone to get more information to provide an answer. I obviously wan't directing my comments at you anyway you were trying to help him.
Varrius,
Your fine just the way you are, not to worry. The reason you leave the solenoid in place and plugged in is to prevent a CEL.
The only information that was privided is that that hose was no longer there. Low and behold all the guy did was bypass the frp solenoid which is not uncommon.
He provided what he knew of the situation, being that he is not mechanically incline people should not jump to conclusions. It took 30 some odd posts for someone to get more information to provide an answer. I obviously wan't directing my comments at you anyway you were trying to help him.
Varrius,
Your fine just the way you are, not to worry. The reason you leave the solenoid in place and plugged in is to prevent a CEL.
Originally Posted by BADEVO
Ah see thats different. In the pics you have he rerouted the FPR. Thats fine right there.
Where is it rerouted? Could you circle it so I know what the FPR hose IS exactly?
Originally Posted by timzcat
trinydex,
The only information that was privided is that that hose was no longer there. Low and behold all the guy did was bypass the frp solenoid which is not uncommon.
He provided what he knew of the situation, being that he is not mechanically incline people should not jump to conclusions. It took 30 some odd posts for someone to get more information to provide an answer. I obviously wan't directing my comments at you anyway you were trying to help him.
Varrius,
Your fine just the way you are, not to worry. The reason you leave the solenoid in place and plugged in is to prevent a CEL.
The only information that was privided is that that hose was no longer there. Low and behold all the guy did was bypass the frp solenoid which is not uncommon.
He provided what he knew of the situation, being that he is not mechanically incline people should not jump to conclusions. It took 30 some odd posts for someone to get more information to provide an answer. I obviously wan't directing my comments at you anyway you were trying to help him.
Varrius,
Your fine just the way you are, not to worry. The reason you leave the solenoid in place and plugged in is to prevent a CEL.
So the guy who did it isn't an idiot, then? I can trust him to do work?
Evolving Member
Joined: Jul 2005
Posts: 352
Likes: 1
From: Sioux CIty, IA
OK varrious,
sorry about that, when you said he completely removed it that is what i was talking about. i didnt know he just re-routed it. ok you are fine that way. sorry about the misunderstanding, i just assumed when you said he removed it, that he completely removed it.
sorry about that, when you said he completely removed it that is what i was talking about. i didnt know he just re-routed it. ok you are fine that way. sorry about the misunderstanding, i just assumed when you said he removed it, that he completely removed it.
Originally Posted by evodan2004
ok so what is the point of this?????????????????
All that solenoid is for is cold start enrichment. The solenoid turns on on a cold start to prevent vacuum from going to the FPR. This raises the fuel pressure to 43 PSI to get more fuel in the engine when it's cold. Once the temperature hits a certain point this solenoid turns off and stays off.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
The worst thing that can happen from solenoid removal is the car will run richer at start up but if it is idle tuned via a flash etc then it doesn't matter.
Evolved Member
Joined: Jun 2006
Posts: 6,902
Likes: 151
From: Grand Island, NE
The engine control unit measures the air going into the engine and then adds the correct amount of fuel to support combustion. The only thing the ECU has control over to do this is the amount of time the fuel injector is electrically driven.
One way to do this would be to have a pressure sensor in the manifold and another pressure sensor on the fuel rail. That way the ECU could calculate how long the injector needed to be driven. The ECU could also calculate manifold pressure from air flow and engine rpm.
However, if fuel pressure is maintained X amount of psi higher than manifold pressure, no matter what the manifold pressure or vacuum might be, then all the ECU needs to do is look up the injector time for that airflow. Hence the FPR.
The solenoid is there to vent the line between the FPR and the manifold to ambient air pressure. This solenoid is activated when the engine is started hot in an effort (often a poor effort) to avoid vapor lock. If you have ever started your car when hot and had it chug or stall, that is what the solenoid was put on there to avoid. Since it doesn't seem to do much good, owners or mechanics often bypass it.
One way to do this would be to have a pressure sensor in the manifold and another pressure sensor on the fuel rail. That way the ECU could calculate how long the injector needed to be driven. The ECU could also calculate manifold pressure from air flow and engine rpm.
However, if fuel pressure is maintained X amount of psi higher than manifold pressure, no matter what the manifold pressure or vacuum might be, then all the ECU needs to do is look up the injector time for that airflow. Hence the FPR.
The solenoid is there to vent the line between the FPR and the manifold to ambient air pressure. This solenoid is activated when the engine is started hot in an effort (often a poor effort) to avoid vapor lock. If you have ever started your car when hot and had it chug or stall, that is what the solenoid was put on there to avoid. Since it doesn't seem to do much good, owners or mechanics often bypass it.