Z31/vacuum lines php - Revision history

XenonzcarImporter: Fix: convert markdown link syntax to wiki syntax; remove broken self-anchor links

2026-05-16T23:37:12Z

Fix: convert markdown link syntax to wiki syntax; remove broken self-anchor links

← Older revision		Revision as of 23:37, 16 May 2026
Line 15:		Line 15:
	so we can compare.		so we can compare.

	~~![image description](~~https://dev.z31library.com/xenonzcar_archive/z31/images/Vacuum/diagram.jpg
	)		https://dev.z31library.com/xenonzcar_archive/z31/images/Vacuum/diagram.jpg


	'86 Turbo Engine Vacuum Lines (w/o A/C or Cruise shown) note: 9/86 Turbo cars also have SURGE TANK system and vacuum lines)		'86 Turbo Engine Vacuum Lines (w/o A/C or Cruise shown) note: 9/86 Turbo cars also have SURGE TANK system and vacuum lines)
Line 110:		Line 111:
	\| (4) to Throttle (right port) \| 4 mm \| 13.5" \| 12" \|		\| (4) to Throttle (right port) \| 4 mm \| 13.5" \| 12" \|

	~~![image description](~~https://dev.z31library.com/xenonzcar_archive/2025siteimages/driver_bucket.jpg
	)		https://dev.z31library.com/xenonzcar_archive/2025siteimages/driver_bucket.jpg


	'Driver Side Behind Headlamp'		'Driver Side Behind Headlamp'
Line 117:		Line 119:
	== Passenger Side of Front Air Gallery ==		== Passenger Side of Front Air Gallery ==

	~~![image description](~~https://dev.z31library.com/xenonzcar_archive/2025siteimages/fpr.jpg
	)		https://dev.z31library.com/xenonzcar_archive/2025siteimages/fpr.jpg


	'Fuel Pressure Regulator'		'Fuel Pressure Regulator'

	~~![image description](~~https://dev.z31library.com/xenonzcar_archive/2025siteimages/pass_carbon.jpg
	)		https://dev.z31library.com/xenonzcar_archive/2025siteimages/pass_carbon.jpg


	'Charcoal Canister Routing'		'Charcoal Canister Routing'
Line 136:		Line 140:
	== Other Vacuum Hoses ==		== Other Vacuum Hoses ==

	~~![image description](~~https://dev.z31library.com/xenonzcar_archive/2025siteimages/egr.jpg
	)		https://dev.z31library.com/xenonzcar_archive/2025siteimages/egr.jpg


	'EGR Valve'		'EGR Valve'

	~~![image description](~~https://dev.z31library.com/xenonzcar_archive/2025siteimages/aiv_bottom.jpg
	)		https://dev.z31library.com/xenonzcar_archive/2025siteimages/aiv_bottom.jpg


	'AVI Bottom Lines'		'AVI Bottom Lines'
Line 161:		Line 167:
	\| (20) Carbon Canister (middle port) to Fuel Return Hardline \| 6 mm \| 9" \|		\| (20) Carbon Canister (middle port) to Fuel Return Hardline \| 6 mm \| 9" \|

	~~![image description](~~https://dev.z31library.com/xenonzcar_archive/2025siteimages/vacuumcanister.jpg
	)		https://dev.z31library.com/xenonzcar_archive/2025siteimages/vacuumcanister.jpg


	'Vacuum Canister and Charcoal Canister'		'Vacuum Canister and Charcoal Canister'

XenonzcarImporter: Rewrite external links to local extras_archive mirror

2026-05-16T22:29:25Z

Rewrite external links to local extras_archive mirror

← Older revision		Revision as of 22:29, 16 May 2026
Line 89:		Line 89:
	Source:		Source:

	[https://www.thumper300zx.com/ Thumper300ZX]		[https://dev.z31library.com/extras_archive/www.thumper300zx.com/ Thumper300ZX]

	https://dev.z31library.com/xenonzcar_archive/2025siteimages/intake_pipe.jpg		https://dev.z31library.com/xenonzcar_archive/2025siteimages/intake_pipe.jpg
Line 95:		Line 95:
	Source:		Source:

	[https://www.thumper300zx.com/ Thumper300ZX]		[https://dev.z31library.com/extras_archive/www.thumper300zx.com/ Thumper300ZX]

	https://dev.z31library.com/xenonzcar_archive/2025siteimages/tb.jpg		https://dev.z31library.com/xenonzcar_archive/2025siteimages/tb.jpg
Line 101:		Line 101:
	Source:		Source:

	[https://www.thumper300zx.com/ Thumper300ZX]		[https://dev.z31library.com/extras_archive/www.thumper300zx.com/ Thumper300ZX]

	\| Connection \| Inner Diameter (mm) \| Stock Length (inches) \| Modified Length (inches) \|		\| Connection \| Inner Diameter (mm) \| Stock Length (inches) \| Modified Length (inches) \|

XenonzcarImporter: Inline image refs: rewrite to local archive; clean empty image artifacts

2026-05-16T18:01:30Z

Inline image refs: rewrite to local archive; clean empty image artifacts

← Older revision		Revision as of 18:01, 16 May 2026
Line 1:		Line 1:
	{{ImportedFrom\|site=Xenonzcar\|title=XenonZcar\|url=~~http~~://~~www~~.~~xenonzcar~~.com/z31/vacuum_lines.php.html\|archive=https://dev.z31library.com/xenonzcar_archive/z31/vacuum_lines.php.html\|fetched=2026-05-15}}		{{ImportedFrom\|site=Xenonzcar\|title=XenonZcar\|url=https://dev.z31library.com/xenonzcar_archive/z31/vacuum_lines.php.html\|archive=https://dev.z31library.com/xenonzcar_archive/z31/vacuum_lines.php.html\|fetched=2026-05-15}}

	== Z31 Vacuum Lines under the hood ==		== Z31 Vacuum Lines under the hood ==
Line 15:		Line 15:
	so we can compare.		so we can compare.

	![image description](~~http~~://~~www~~.~~xenonzcar~~.com/z31/images/Vacuum/diagram.jpg		![image description](https://dev.z31library.com/xenonzcar_archive/z31/images/Vacuum/diagram.jpg
	)		)

Line 85:		Line 85:
	== Driver's Side Front Air Gallery (from front to back) ==		== Driver's Side Front Air Gallery (from front to back) ==

	~~[http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/gallery.jpg ~~image: Driver Side Valve Cover Front]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/gallery.jpg

	Source:		Source:
Line 91:		Line 91:
	[https://www.thumper300zx.com/ Thumper300ZX]		[https://www.thumper300zx.com/ Thumper300ZX]

	~~[http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/intake_pipe.jpg ~~image: Intake Pipe Routing]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/intake_pipe.jpg

	Source:		Source:
Line 97:		Line 97:
	[https://www.thumper300zx.com/ Thumper300ZX]		[https://www.thumper300zx.com/ Thumper300ZX]

	~~[http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/tb.jpg ~~image: Throttle Body]~~		https://dev.z31library.com/xenonzcar_archive/2025siteimages/tb.jpg

	Source:		Source:
Line 110:		Line 110:
	\| (4) to Throttle (right port) \| 4 mm \| 13.5" \| 12" \|		\| (4) to Throttle (right port) \| 4 mm \| 13.5" \| 12" \|

	![image description](~~http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/driver_bucket.jpg		![image description](https://dev.z31library.com/xenonzcar_archive/2025siteimages/driver_bucket.jpg
	)		)

Line 117:		Line 117:
	== Passenger Side of Front Air Gallery ==		== Passenger Side of Front Air Gallery ==

	![image description](~~http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/fpr.jpg		![image description](https://dev.z31library.com/xenonzcar_archive/2025siteimages/fpr.jpg
	)		)

	'Fuel Pressure Regulator'		'Fuel Pressure Regulator'

	![image description](~~http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/pass_carbon.jpg		![image description](https://dev.z31library.com/xenonzcar_archive/2025siteimages/pass_carbon.jpg
	)		)

Line 136:		Line 136:
	== Other Vacuum Hoses ==		== Other Vacuum Hoses ==

	![image description](~~http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/egr.jpg		![image description](https://dev.z31library.com/xenonzcar_archive/2025siteimages/egr.jpg
	)		)

	'EGR Valve'		'EGR Valve'

	![image description](~~http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/aiv_bottom.jpg		![image description](https://dev.z31library.com/xenonzcar_archive/2025siteimages/aiv_bottom.jpg
	)		)

Line 161:		Line 161:
	\| (20) Carbon Canister (middle port) to Fuel Return Hardline \| 6 mm \| 9" \|		\| (20) Carbon Canister (middle port) to Fuel Return Hardline \| 6 mm \| 9" \|

	![image description](~~http~~://~~www~~.~~xenonzcar~~.com/2025siteimages/vacuumcanister.jpg		![image description](https://dev.z31library.com/xenonzcar_archive/2025siteimages/vacuumcanister.jpg
	)		)

XenonzcarImporter: XenonzcarImporter moved page Sites/Xenonzcar/z31/vacuum lines php to Z31/vacuum lines php without leaving a redirect: Flatten Sites/ namespace; provenance preserved via ImportedFrom banner

2026-05-16T06:38:42Z

XenonzcarImporter moved page Sites/Xenonzcar/z31/vacuum lines php to Z31/vacuum lines php without leaving a redirect: Flatten Sites/ namespace; provenance preserved via ImportedFrom banner

← Older revision	Revision as of 06:38, 16 May 2026
(No difference)

XenonzcarImporter: Site import

2026-05-16T06:27:42Z

Site import

New page

{{ImportedFrom|site=Xenonzcar|title=XenonZcar|url=http://www.xenonzcar.com/z31/vacuum_lines.php.html|archive=https://dev.z31library.com/xenonzcar_archive/z31/vacuum_lines.php.html|fetched=2026-05-15}}

== Z31 Vacuum Lines under the hood ==

This page includes lists and diagrams of vacuum lines for the '''1986 Turbo (MT)'''.
Any differences between models should be minimal, though they may exist—especially as additional
control items were added in later years. The diagrams should be very helpful with vacuum diagnostics.

Lengths are approximations, rounded up to the nearest inch, based on the hoses routed in my car at the time of measurement. Except for the vacuum pump lines, all of the lines installed in my Z were stock.

Upon replacement, I modified the lengths on the
front gallery lines and A/C lines to minimize cost and hose usage.
If you find that stock lengths—or your modified routes—differ from what I’ve listed,
please [drop me a note](mailto:sales@xenonzcar.com)
so we can compare.

![image description](http://www.xenonzcar.com/z31/images/Vacuum/diagram.jpg
)

'86 Turbo Engine Vacuum Lines (w/o A/C or Cruise shown) note: 9/86 Turbo cars also have SURGE TANK system and vacuum lines)

== Z31 Vacuum Line Replacement ==

To replace all the applicable engine lines (including all '''vacuum''' and
'''coolant''' lines), you will want to order the following lengths.
If you are not replacing certain sections, simply subtract the noted lengths and diameters
from the total in the ''"kit"''.

Important: These lengths are based on the rerouting modifications I have made on my car. Each measurement is slightly overestimated, and totals are rounded up to the nearest foot. This means you’ll have a little left over from each hose length.

Since hoses are sold by the foot, expect to end up with a few extra inches of material—
which is helpful as a backup. If you want to replace the
'''vacuum tank through firewall hose''', be sure to
add about 6 feet to your order.

=== Order Needed (Modified Lengths) ===

| Hose Size | Exact Length | Order Amount | Notes |
|---|---|---|---|
| 3mm | 116" | 10 ft | Base replacement |
| 4mm | 165.5" | 14 ft | Base replacement |
| 6mm | 103.5" | 9 ft | May require 10 ft minimum order |
| 10mm | 56" | 5 ft | Replaces brake booster hose (stock is formed) |
| 3/16" Clear Vinyl | 14" | 2 ft | Available at Home Depot |

'''Note:''' Does not include vacuum tank through firewall hose (~6 ft) or vacuum hoses inside the car (A/C controls).

==== Extra Foot Order (Recommended) ====

| Hose Size | Recommended Order |
|---|---|
| 3mm | 11 ft |
| 4mm | 15 ft |
| 6mm | 10 ft |
| 10mm | 6 ft (may require 10 ft minimum) |

== Z31 Vacuum Line Installation ==

Installation is straightforward — '''replace one line at a time''' to avoid confusion.

==== Clamps & Fitment ====

-
The
'''stock hose clamps'''on the 6mm lines will not fit tightly on the new 6mm hoses. You can either modify or replace the clamps. - While some may run without clamps, it is highly recommended to use them on coolant lines.
-
On the
'''vacuum tank''', some connectors have guards around the nipple. The new 3mm silicone line will not fit because of its wall thickness. Options:- Carefully trim the inner width with an
''Exacto knife'' - Or, use a short piece of old hose with a barrel connector to bridge to the new line

* Carefully trim the inner width with an

==== Important Warnings ====

⚠️ '''Silicone hose can stretch and balloon under pressure.'''
Poorly secured hoses may cause '''boost leaks'''.

🚫 Do '''not''' use silicone hose in the following applications:

* High heat zones
* Fuel or oil transport
* PCV systems or hoses connected to valve covers
* Other oily emission areas

== Driver's Side Front Air Gallery (from front to back) ==

[http://www.xenonzcar.com/2025siteimages/gallery.jpg image: Driver Side Valve Cover Front]

Source:

[https://www.thumper300zx.com/ Thumper300ZX]

[http://www.xenonzcar.com/2025siteimages/intake_pipe.jpg image: Intake Pipe Routing]

Source:

[https://www.thumper300zx.com/ Thumper300ZX]

[http://www.xenonzcar.com/2025siteimages/tb.jpg image: Throttle Body]

Source:

[https://www.thumper300zx.com/ Thumper300ZX]

| Connection | Inner Diameter (mm) | Stock Length (inches) | Modified Length (inches) |
|---|---|---|---|
| (1) to FPR Control Valve (bottom) | 4 mm | 21" | 15" |
| (2) to FPR Control Valve (top) | 4 mm | 23" | 15" |
| (3) to Manifold | 6 mm | 20" | 19" |
| (4) to Throttle (right port) | 4 mm | 13.5" | 12" |

![image description](http://www.xenonzcar.com/2025siteimages/driver_bucket.jpg
)

'Driver Side Behind Headlamp'

== Passenger Side of Front Air Gallery ==

![image description](http://www.xenonzcar.com/2025siteimages/fpr.jpg
)

'Fuel Pressure Regulator'

![image description](http://www.xenonzcar.com/2025siteimages/pass_carbon.jpg
)

'Charcoal Canister Routing'

| Connection | Inner Diameter (mm) | Stock Length (inches) |
|---|---|---|
| (5) to Manifold Front | 4 mm | 3" |
| (6) to FPR | 4 mm | 3" |
| (7) to Carbon Canister (bottom, left port) | 6 mm | 14.5" |
| (8) to Carbon Canister (top, left port) | 4 mm | 16.5" |

== Other Vacuum Hoses ==

![image description](http://www.xenonzcar.com/2025siteimages/egr.jpg
)

'EGR Valve'

![image description](http://www.xenonzcar.com/2025siteimages/aiv_bottom.jpg
)

'AVI Bottom Lines'

| Connection | Inner Diameter (mm) | Stock Length (inches) |
|---|---|---|
| (9) EGR Control to EGR | 4 mm | 5" |
| (10) EGR Control Valve to Rear Gallery (pass) | 4 mm | 2.5" |
| (11) 'TEE' to Boost Sensor | 3 mm | 7" (5" modified) |
| (12) 'TEE' to AIV Control Valve (Top) | 4 mm | 12" |
| (13) AIV Control Valve (Bottom) to Intake Front | 4 mm | 13" |
| (14) AIV Control Valve (Middle) to AIV | 4 mm | 5" |
| (15) Throttle to Rear Gallery (driver) | 4 mm | 10.5" |
| (16) Manifold to 'TEE' | 4 mm | 35" (25" modified) |
| (17) Intake to Carbon Canister (right port) | 6 mm | 46" (38" modified) |
| (18) Headlight Motor Vent Lines (Clear Vinyl) | 3/16" | 2 × 7" |
| (19) Vacuum Pump to Vacuum Canister | 3 mm | ~26" |
| (20) Carbon Canister (middle port) to Fuel Return Hardline | 6 mm | 9" |

![image description](http://www.xenonzcar.com/2025siteimages/vacuumcanister.jpg
)

'Vacuum Canister and Charcoal Canister'

=== Vacuum Tank Hoses ===

| Connection | Inner Diameter (mm) | Length |
|---|---|---|
| Intake to Vacuum Tank | 3 mm | 46" (modified) |
| Cruise to Vacuum Tank | 4 mm | 28" (modified) |
| A/C Heater Cock Control to Vacuum Tank | 3 mm | 39" (modified) |
| Vacuum Tank to Firewall | N/A | ~6 feet |

=== Coolant & Brake Booster Hoses ===

| Connection | Inner Diameter (mm) | Length |
|---|---|---|
| Passenger Side Manifold Coolant Line to Rear Gallery | 10 mm | 9" |
| Passenger Side Collector Coolant Line to Manifold | 10 mm | ~5-6" (OEM formed) |
| Throttle Coolant Line to Driver Side Gallery | 10 mm | 7" |
| Throttle Coolant Line to Turbo Passage | 10 mm | 10" |
| Turbo Coolant Line to Driver Side Gallery | 10 mm | 10" |
| Coolant Reservoir Line to Coolant Tube | 6 mm | 23" (could be shortened) |
| Manifold to Brake Booster Check Valve | 10 mm | 3" (modified // OEM formed) |
| Brake Booster Check Valve to Brake Booster | 10 mm | 4" (modified // OEM formed) |

[[Category:Imported from Xenonzcar]]