Thread: Carbon Canister Lines

So I'm trying to resolve a gasoline fume issue that has popped up with my car. It seems to be coming from the engine bay area. I looked at the fuel lines and didn't see any sign of leaking fuel. I also looked at the injectors and did not see any fuel seeping out.

Just following my nose the smell seems strongest around the driver wheel well area. I'm thinking maybe its an issue with my carbon canister.

There is a JDM engine in my car. The intake manifold is missing some of the USDM emissions equipment. Only one of the carbon canister lines are connected to the engine. The top most and thinnest line is not present.

From looking at the FSM the carbon canister is supposed to pass gas fumes into the intake manifold so that they can be burned. From looking at the diagrams in the FSM I'm thinking that thin line must be a control line. In the FSM it talks about fumes being sent into the intake manifold at low and high rpms.


My question is does the carbon canister fail to pass fumes to the intake if that top most hose is disconnected?

I'm having almost the same problem, I have a vvl engine in the car and none of the lines are connected to anything, I capped the big line and the small line but I can still smell it, and more recently I've been noticing my mpg dropping

Same issue here. JDM engine in my 93 SE-R. I intend to resolve this sometime in the next couple of weeks.

Ok fellas I think I understand the problem now. I looked at the FSM and read some of the descriptions in the EF&EC Section.


EGR&Canister Control
System Description
"In addition, a system is provided which precisely cuts and controls port vacuum applied to the E.G.R control valve and canister to suit engine operating conditions. This cut-and control operation is accomplished through the E.C.U. When the E.C.U detects any of the following conditions, current flows through the solenoid valve in the E.G.R and canister control vacuum line.

This causes the port vacuum to be discharged into the atmosphere so that the E.G.R control valve and canister remain closed.
1.) Low Engine Temperature
2.) Engine Starting
3.) High-Speed Engine Operation
4.) Engine idling
5.) Excessively high engine temperature
6.) Air flow malfunction "

From this I take it that no vacuum to the carbon canister defaults it to closed. Therefore in my situation those fumes are never heading towards the intake manifold. I'm thinking that the canister has reached a limit of absorption and maybe the excess is finding its way out. I too will work on this as I don't want to keep breathing gasoline fumes.

I figured out what I'm going to do. I'm going to reuse the EGR/Canister control solenoid valve. The side tube I will use for the canister, and the bottom tube I will connect to the intake nipple. I'll report if I still smell the gasoline fumes.

This worked. I just forgot to update, lol.