1981 jeep WRANGLER 6cyl , EVAP gross leak

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1981 jeep WRANGLER 6cyl , EVAP gross leak

mdpepper
1981 Jeep Wrangler 6 cyl

Can someone help , Is this vehicle suppose to get the EVAP functional test? The canister is in the front of the vehicle but it failed as a gross leak. The shop down the street where the customer took it to says it has a roll over valve in the tank and cant be tested. any link from the state on EVAP TESTING would help,,

thank you
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Re: 1981 jeep WRANGLER 6cyl , EVAP gross leak

No One
mdpepper wrote
1981 Jeep Wrangler 6 cyl

Can someone help , Is this vehicle suppose to get the EVAP functional test? The canister is in the front of the vehicle but it failed as a gross leak. The shop down the street where the customer took it to says it has a roll over valve in the tank and cant be tested. any link from the state on EVAP TESTING would help,,

thank you
A Roll-Over Valve is a safety device that hinders fuel leakage in the instance of a vehicle roll over.

Used in conjunction with your vent line, a rollover valve will allow your tank to breathe and not build up pressure or vacuum during normal operation. When the rollover vent valve is on its side or upside down, a check ball inside the valve will close to prevent gas from running out.

Furthermore, how does fuel tank vent valve work? The fuel tank vent valve is part of a vehicle's evaporative emission control (EVAP) system, which lowers the amount of vapors released from the fuel tank into the atmosphere. The fuel tank vent valve controls the flow of air getting into and out of the charcoal canister.

Keeping this in view, does a fuel tank need a breather?

Your tank has to breathe. In order to breathe, your tank must have a vent somewhere that will relieve both vacuum and pressure. Gasoline expands in volume as it warms up and shrinks in volume as it cools down. The fuel level of your tank changes throughout the day, even if you are not driving it.

How does a rollover valve work?

The valves relieve fuel tank pressure and prevent fuel flow through the fuel tank vent hoses in the event of vehicle rollover. If the vehicle should roll over, the valve is inverted and the plunger is forced against the guideplate, preventing fuel from flowing through the vent tube.


My 1989 ford bronco has a roll-over valve and it passes the evap test. You should look at the test history of the car and ask if they have past smog test to confirm others were not testing it.
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Re: 1981 jeep WRANGLER 6cyl , EVAP gross leak

none
In reply to this post by mdpepper
These roll over valves fail a lot but they still need to be a sealed system and I still evap test them. If the roll over valve is good it will pass the pressure test.
Good judgement comes from experience. And experience? Well that comes from poor judgement.
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Re: 1981 jeep WRANGLER 6cyl , EVAP gross leak

No One
In reply to this post by mdpepper
Id like an update on this fail.
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Re: 1981 jeep WRANGLER 6cyl , EVAP gross leak

defective
In reply to this post by mdpepper
Looks like a sealed system to me.

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Re: 1981 jeep WRANGLER 6cyl , EVAP gross leak

Kevin
In reply to this post by mdpepper
they need to take it somewhere else it's a easy system to test and verify, if there down in san jose area give they can come to my shop

On Wed, Feb 24, 2021 at 3:41 PM mdpepper [via Stop The Star Program] <[hidden email]> wrote:
1981 Jeep Wrangler 6 cyl

Can someone help , Is this vehicle suppose to get the EVAP functional test? The canister is in the front of the vehicle but it failed as a gross leak. The shop down the street where the customer took it to says it has a roll over valve in the tank and cant be tested. any link from the state on EVAP TESTING would help,,

thank you


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Re: 1981 jeep WRANGLER 6cyl , EVAP gross leak

mdpepper
thank you