Toyota MR2 Message Board - View Single Post - Bits and pieces from the old V6 Sticky...

DaveMush · 09-06-2005, 10:56 AM

Ok, for those of you who may want to do the swap w/ the stock ECU...
I mounted the EVAP cansister in the left corner of the trunk. Ran my hoses from the trunk, around the suspension tower, and drilled a hole in the left wall of the engine bay to install a rubber bung. This whole thing assumes that you got the EVAP canister, stock airbox, and all the associated sensors to go w/ it.

OK, SO...

The EVAP canister basically has 7 tubes connected to it per the 2001 Repair manual. They are as follows:
1.)EVAP/purge line FROM the EVAP VSV
2.)EVAP line TO the tank (cut-off valve at the tank)
3.)TO the VSV for pressure switching valve
4.)FROM the VSV for pressure switching valve
5.)air inlet line FROM VSV for Closed Canister Valve (CCV) (VSV for CCV comes FROM the stock airbox or intake tube on one side, and the EVAP canister on the other side.)
6.)Vent line TO fuel tank (check-valve at the tank)
7.)Vapor pressure sensor TO fuel tank.

I figured out the solution to how to hook this whole mess up to the stock MR2 system w/o drilling/making new connections to the fuel tank.

1.) this line is self explanatory.

2.)The 91' MR2 has only 2 connections to the tank w/ the exception of fuel pump and return lines. Both of them connect to a cut-off valve at the tank, and to the fuel evaporative separator behind the firewall. There's only 1 connection at the top of the separator. This line normally would run to the charcoal canister.
I used this line to connect to the 2.)EVAP line to the tank.

3.) & 4.) self explanatory.

5.) Connects to the CCV. Again, self explanatory.

6.) & 7.) This part may get difficult to follow. But hear me out...
-The Vent line is about 5/8" corrugated plastic hose w/ a "special connector" at the EVAP canister. If you remove the connector, you can easily use regular rubber hose to connect to the canister. The Vent line is a simple connection to the tank to allow fuel vapor to travel between the Tank and canister.
-The Vapor pressure sensor connects to the canister w/ a smal diameter vaccum hose, and to the tank w/ a 1/4" hose. The vapor pressure sensor is used to detect if the cap fuel cap is in and tight.

-The breather line to the fuel tank on the MR2 is the line that goes from the tank, follows up the tank filler pipe, and has a hole at the top of the filler pipe. This line is blocked when the fuel cap is present, and open to let air out of the tank when you fill it w/ gas.

What I did was this:
Cut the breather line to the tank where the rubber hose shunt is behind the heat sheld. Instal a 1/2 x 1/2 x 1/2 PVC Tee connector (bought at Home Depot) in the rubber hose. Off the 3rd pole of the tee, run a single 1/2" hose to the charcoal canister's location.

09-06-2005, 10:56 AM	#4 (permalink)
DaveMush Mr2 V6 #8 Join Date: Aug 2005 Location: Syracuse, Ny Posts: 381 Thanks: 0 Thanked 13 Times in 11 Posts iTrader Rating: (0/0% )	EVAP Canister Installation Ok, for those of you who may want to do the swap w/ the stock ECU... I mounted the EVAP cansister in the left corner of the trunk. Ran my hoses from the trunk, around the suspension tower, and drilled a hole in the left wall of the engine bay to install a rubber bung. This whole thing assumes that you got the EVAP canister, stock airbox, and all the associated sensors to go w/ it. OK, SO... The EVAP canister basically has 7 tubes connected to it per the 2001 Repair manual. They are as follows: 1.)EVAP/purge line FROM the EVAP VSV 2.)EVAP line TO the tank (cut-off valve at the tank) 3.)TO the VSV for pressure switching valve 4.)FROM the VSV for pressure switching valve 5.)air inlet line FROM VSV for Closed Canister Valve (CCV) (VSV for CCV comes FROM the stock airbox or intake tube on one side, and the EVAP canister on the other side.) 6.)Vent line TO fuel tank (check-valve at the tank) 7.)Vapor pressure sensor TO fuel tank. I figured out the solution to how to hook this whole mess up to the stock MR2 system w/o drilling/making new connections to the fuel tank. 1.) this line is self explanatory. 2.)The 91' MR2 has only 2 connections to the tank w/ the exception of fuel pump and return lines. Both of them connect to a cut-off valve at the tank, and to the fuel evaporative separator behind the firewall. There's only 1 connection at the top of the separator. This line normally would run to the charcoal canister. I used this line to connect to the 2.)EVAP line to the tank. 3.) & 4.) self explanatory. 5.) Connects to the CCV. Again, self explanatory. 6.) & 7.) This part may get difficult to follow. But hear me out... -The Vent line is about 5/8" corrugated plastic hose w/ a "special connector" at the EVAP canister. If you remove the connector, you can easily use regular rubber hose to connect to the canister. The Vent line is a simple connection to the tank to allow fuel vapor to travel between the Tank and canister. -The Vapor pressure sensor connects to the canister w/ a smal diameter vaccum hose, and to the tank w/ a 1/4" hose. The vapor pressure sensor is used to detect if the cap fuel cap is in and tight. -The breather line to the fuel tank on the MR2 is the line that goes from the tank, follows up the tank filler pipe, and has a hole at the top of the filler pipe. This line is blocked when the fuel cap is present, and open to let air out of the tank when you fill it w/ gas. What I did was this: Cut the breather line to the tank where the rubber hose shunt is behind the heat sheld. Instal a 1/2 x 1/2 x 1/2 PVC Tee connector (bought at Home Depot) in the rubber hose. Off the 3rd pole of the tee, run a single 1/2" hose to the charcoal canister's location.