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Is that vac. line supposed to collapse when i start the car, what causes it to collapse ?

Posted by thomas welch on

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john h

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Vac lines are not suppose to collapse replace line assuming on older vehicle since you didnt specify anything

Posted on Apr 30, 2018

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Bill Boyd

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Incorrect hose in use

Posted on Dec 28, 2017

Testimonial: "its definitely factory installed, im thinking maybe its clogged from something"

  • Bill Boyd Dec 28, 2017

    I answered your question but I see that around 50 questions earlier you mentioned EVAP purge valve
    you would be correct as that line probably vents any pressure from the fuel tank
    run the fault codes to see if purge valve or purge valve solenoid problem

  • thomas welch
    thomas welch Apr 30, 2018

    oh yeah, It turned out to be the evap hose behind the passenger tire was completely unhooked, wow thanks for ur help..

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1 Answer

What cause lower hose to collapse after cool down


I would start by replacing the radiator cap. A bad cap can stop the flow of coolant from the coolant reservoir back into the engine when the engine cools down. This will cause a vacuum and collapse the hoses.

The other possibility is the lower hose is starting to get weak. This compounded with a radiator cap that is not functioning correctly will cause the the hose to collapse when the engine cools off.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Sep 27, 2015 | 1991 Toyota Corolla

2 Answers

Should my brake booster have vaccuum pressure when not running


Yes the check valve holds vac in the booster.
Not sure about the line you replaced.

Jul 10, 2012 | 1998 Volkswagen Golf

1 Answer

A/C stuck on floor vent.


a vac. problem several possible causes a vac. line off at the vac. canister under the hood. a broken vac line with time some lines crack and are no longer functioning a bad activator under your dash. a bad control head on your dash if it just started acting up I would look to source vac.

Jun 25, 2012 | 2005 Nissan Altima

1 Answer

Running rich


Hi. There are many causes for this occurrence. I will list the most common culprits below:

1. Vac line disruptions(separated, collapsed,soot filled)
2. MAF sensor malfunction
3. Malfunctioning injectors
4. Malfunctioning EVAP assembly
5. Malfunctioning spark plugs
6. Inadequate or excessive fuel pressure
7. Improperly functioning EGR valve
8. Bad O2 sensor

I would recommend to access and check all the above for faults. replace failed component, if needed. A ECM/PCM scan would be in order at this time to isolate the actual culprit.

Oct 07, 2011 | Dodge Ram Pickup 1500 Cars & Trucks

2 Answers

Fault code p1450 inability of evaporative emmisins control system to bleed fuel tank what could this mean?


The purge valve is supposed to keep sucking vapor from the gas tank, through the charcoal canister, and it never works right.
A loose gas cap can not only cause it to flash a problem, but will also cause too lean of a mixture and harm the engine.
The purge valve system is prone to way too many leaks, and the consequence of not letting enough vent air into the gas tank, can be a collapsed tank or a blown fuel pump.
It is not worth the risk.
The easiest thing to do is vent the tank to the open air after the charcoal canister, as all boats, lawn mowers, etc., are, and all cars used to be. But then also plug the line going to the air intake, because otherwise it will be a leak and cause too lean of a mixture.
The purge valve is another bad idea that eventually is bound to have catastrophic results. Too many car engineers forget cars spend a decades in freezing cold, blistering heat, torrential rain, vibrations, etc.

Aug 12, 2010 | 2000 Ford Expedition

1 Answer

Where does the a/c system get its' vacum


Vacuum for the controls originates at the intake manifold. Check to see if there is a vac. diagram under the hood and or "dog house" (inside engine cover) if there is you can trace the source. It is not uncommon for vac. lines to collapse from age or contact with various chemicals (oil, cleaners) over time.

Jul 21, 2010 | 1995 Chevrolet G20

1 Answer

1995 grand am starts and runs fine, when the brake pedel is pressed the engine bogs down and dies, also when you try to roll down the windows the engine bogs down, but does not die. What could this be? I...


Check the vacuum hose for inside collapsing. Sometimes the vac lines inner lining will seperate & cause all kinds of similar problems when the brake peddle is depressed. Also check your egr valve operation. It could be blocked up with carbon or leaking vacuum. Good luck!

Apr 10, 2010 | 1995 Pontiac Grand Am

1 Answer

I have a 2006 f150 4 wheel dr it wont go in 4 wheel dr when u turn on panel switch and the light wont turn in checked all fuses seem ok


Starting with the vac reservoir behind the battery box, working towards the IWEs, check for cracks in the vac lines and that the check valves are working.

You can place a vac gauge on the IWE vac input, and check to see if it holds vac as a first step. This is the rough outline of the IWE vac components. The IWE without vac will not lock in. Usually the vac lines are the cause of the IWEs not locking into place. Without this, the 4x4 indicator lamps on the cluster will not illuminate ( that is actually a confirm everything is OK, and the status is locked into place ).
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Nov 22, 2009 | 2006 Ford F-150

1 Answer

No air from dash vents


They are vac. controled. The leak could be behind the controls, but first check under the hood usually near the fire wall and check for any cracked or broken vac. lines and repair as necc. this should solve your problem. The vac. lines under the hood go bad first due to engine heat. If you have a length of line to replace make sure you use vac. line so it wont collapse. Soft softs in vac. lines is another sign of a bad line replace these also.

Jun 28, 2009 | 2000 Chevrolet Astro

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