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HoseTechniques Vacuum Hose
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Installed Vacuum Hoses

Vacuum leaks are annoying to track down and after a while the vacuum hoses on our car start to get brittle. They are also black so they are hard to trace around. So I decided to replace mine with red silicon ones from HoseTechniques which last much longer and is easier to see. This is an easy procedure to do and takes about 4 hours working without rush. You will get bruised knuckles and having small arms is helpful for reaching some of the hoses under the intake manifold. First you have to order the hose. I ordered their kit but I decided to make an itemized list for those of you who want more specifics because they just give you the hose and tools but list of all the hoses you need to replace. This is also useful for those who just want to order the hose. All of these numbers are for my Supra which is an 1989 Turbo with all the gadgets on it so your needs may vary. But it is a good starting point and when ordering hose you should get extra anyways in case you need some later.

Hose Summary
ID (mm) Total Length (cm)
3.5 435.0
4.0 167.0
6.0 271.0
8.0 100.5


To do the replacement pick a hose, replace it and then move on to the next one. DO NOT pull them all off the car at the same time, you will probably have a nightmare putting everything back together. I suggest precutting all of the hose so that you don't get it all dirty cutting when you need it. You just need to keep them organized but since length is the only thing that matters its not to difficult. If the old hose is sticking, like most will, take a razor blade and carefully cut a slit, be careful not to cut too deep, so you can then peal it loose. After you are all done start the car and check the level of vacuum it should be around 21 in/Hg if not then something came loose. If it wasn't 21 in/Hg before you started then maybe you missed a hose or something else is leaking.

7M-GTE Vacuum Diagram
Main Vacuum Hoses
Location
Length (cm)
ID (mm)
Bimetal Vacuum Switching Value(BVSV) to metal pipe on AFM anchor brace.
30.0
3.5
Bimetal Vacuum Switching Value(BVSV) to metal pipe on passenger side of the 3000 Pipe.
33.0
3.5
Throttle Body to metal pipe along the front of the 3000 Pipe.
20.0
3.5
Throttle Body to metal pipe in front of the intake manifold.
39.0
3.5
Fuel Pressure Regulator to metal pipe in front of the intake manifold.
16.0
3.5
EGR Modulator(EGR VM) to pipe near the rear wall.
28.0
3.5
EGR Modulator(EGR VM) to EGR Valve.
26.0
3.5
Pipe near rear wall from EGR VM to VSV for EGR
14.0
3.5
VSV for EGR to bottom of metal pipe in front of the intake manifold.
8.0
3.5
VSV by bottom of metal pipe network to metal pipe network.
18.0
3.5
VSV by bottom of metal pipe network to metal pipe network.
16.0
3.5
Dash Pot to VTV.
4.0
3.5
Elbow by the front corner of the surge tank (17344C).
10.5
8.0
Bottom of Accordion Hose to Power Steering Idle up connection.
26.0
6.0
Drivers side connection from pipe network to PS Idle-Up pipe(17343B).
15.0
6.0
Passenger side PS Idle-Up pipe to valve(17342B).
12.0
6.0


7M-GTE Cruse Control Vacuum Diagram
Cruse Control Vacuum Hoses
Location
 Length (cm) ID (mm)
Read side if intake manifold to T junction at back wall.
 15.5 3.5
Small join from T junction at back wall to hard line leading to passenger side.
 3.0 3.5
T junction at back wall to 4 way T at Cruse Control.
 41.0 3.5
Cruse Control actuator to "ACT" connection on Cruse Control pump.
 12.0 3.5
4 way T at Cruse Control to "VAC" connection on Cruse Control pump.
 11.5 3.5
4 way T at Cruse Control to Cruse Control switch.
 23.0 3.5


7M-GTE Heater Valve Vacuum Diagram
Heater Valve Vacuum Hoses
Location
 Length (cm) ID (mm)
Hard line on back wall to white side of the VTV on passenger side.
 3.0 3.5
Black side of the VTV on passenger side to Valve Magnet.
 5.5 3.5
Heater Water valve to Valve Magnet.
 14.0 3.5


7M-GTE Washer Hose Diagram
Washer Fluid Hoses
Location
 Length (cm) ID (mm)
Driver side nozzle to passenger side 3 way T.
 45.0 4.0
Passenger side 3 way T to fender junction.
 62.0 4.0
Passenger side fender hose for front washers(Use Zip Ties).
 84.0 6.0
Passenger side pump to fender hose for front washers(Use Zip Ties).
 75.0 6.0
Passenger side pump to fender hose for rear washer(Use Zip Ties).
 60.0 4.0


Miscellaneous Hoses
Location
 Length (cm) ID (mm)
"Purge" side on Charcoal Canister to AFM bracket.
 54.0 3.5
"To Tank" side on Charcoal Canister to connection at fire wall.
 18.0 6.0
BOV to metal pipe in front of the 3000 Pipe.
 12.0 6.0
Metal pipe in front of 3000 pipe to connection at coil pack ground bolt.
 14.0 6.0
Connection below coil pack ground bolt to pipe network.
 15.0 6.0
Radiator to Overflow Canister (Water).
 90.0 8.0


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