Fuel tank ventilation Series 3 double six 1979
#1
Fuel tank ventilation Series 3 double six 1979
Hello,
I accidentally ran out of fuel and when I opened the cap to replenisch I heart a sissing noise (sucking air) and the metal tank itself made a short noise as if it expanded due to the dissapering vacuum in it. I wonder if a fule tank shoundn't be ventilated?
I accidentally ran out of fuel and when I opened the cap to replenisch I heart a sissing noise (sucking air) and the metal tank itself made a short noise as if it expanded due to the dissapering vacuum in it. I wonder if a fule tank shoundn't be ventilated?
#3
Join Date: Jul 2012
Location: Walnut Creek, California
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Venting applies to any fuel tank with a sealing cap.
Originaly in recent vehicle history, vented to the atmosphere.
Then, a transition. Fuel caps came vented and unvented. Unvented caps on a non vented tanks caused issues or at least consternation.
In areas where emission laws are strict, complex venting is installed. Objective, direct the fumes to the engine to burn.
Jaguars have pipes from the top of the tank, up the C posts, dowen again and thence to the right front wheel well. A canister and one way valve are found there. The canister is packed with charcoal. in turn, it is relieved of vapor by a pipe to the intake manifold.
Failures can occur in two ways anywhere along the way. Rust through, vapor to the atmosphere. usually un noticed.
Plugged or filed one way valve. As fuel is withdrawn from the tand, a vacuum begins to form. when the pump can no longer over come the vacuum, the engine stops running...
A whoosh on opening a tank is air rushing in to the vacuum. Old rule in physics. Nature abhors a vacuum....
Carl
Originaly in recent vehicle history, vented to the atmosphere.
Then, a transition. Fuel caps came vented and unvented. Unvented caps on a non vented tanks caused issues or at least consternation.
In areas where emission laws are strict, complex venting is installed. Objective, direct the fumes to the engine to burn.
Jaguars have pipes from the top of the tank, up the C posts, dowen again and thence to the right front wheel well. A canister and one way valve are found there. The canister is packed with charcoal. in turn, it is relieved of vapor by a pipe to the intake manifold.
Failures can occur in two ways anywhere along the way. Rust through, vapor to the atmosphere. usually un noticed.
Plugged or filed one way valve. As fuel is withdrawn from the tand, a vacuum begins to form. when the pump can no longer over come the vacuum, the engine stops running...
A whoosh on opening a tank is air rushing in to the vacuum. Old rule in physics. Nature abhors a vacuum....
Carl
The following users liked this post:
patpin (08-25-2016)
#6
Venting applies to any fuel tank with a sealing cap.
Originaly in recent vehicle history, vented to the atmosphere.
Then, a transition. Fuel caps came vented and unvented. Unvented caps on a non vented tanks caused issues or at least consternation.
In areas where emission laws are strict, complex venting is installed. Objective, direct the fumes to the engine to burn.
Jaguars have pipes from the top of the tank, up the C posts, dowen again and thence to the right front wheel well. A canister and one way valve are found there. The canister is packed with charcoal. in turn, it is relieved of vapor by a pipe to the intake manifold.
Failures can occur in two ways anywhere along the way. Rust through, vapor to the atmosphere. usually un noticed.
Plugged or filed one way valve. As fuel is withdrawn from the tand, a vacuum begins to form. when the pump can no longer over come the vacuum, the engine stops running...
A whoosh on opening a tank is air rushing in to the vacuum. Old rule in physics. Nature abhors a vacuum....
Carl
Originaly in recent vehicle history, vented to the atmosphere.
Then, a transition. Fuel caps came vented and unvented. Unvented caps on a non vented tanks caused issues or at least consternation.
In areas where emission laws are strict, complex venting is installed. Objective, direct the fumes to the engine to burn.
Jaguars have pipes from the top of the tank, up the C posts, dowen again and thence to the right front wheel well. A canister and one way valve are found there. The canister is packed with charcoal. in turn, it is relieved of vapor by a pipe to the intake manifold.
Failures can occur in two ways anywhere along the way. Rust through, vapor to the atmosphere. usually un noticed.
Plugged or filed one way valve. As fuel is withdrawn from the tand, a vacuum begins to form. when the pump can no longer over come the vacuum, the engine stops running...
A whoosh on opening a tank is air rushing in to the vacuum. Old rule in physics. Nature abhors a vacuum....
Carl
Is there a way to exclude the tank beiing under pressure instead of vacuum, since I guess it ll make the same noise?
It's a European car, not the strict emissions as in USA. Do all XJ12' have charcoal canisters? Where are those located? Where is it gooing to (to be burned?).
Last edited by patpin; 08-30-2016 at 12:20 PM.
#7
Join Date: Jul 2012
Location: Walnut Creek, California
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Just a surmise.
Lok under the right front wing. Is there a canister there? If so, it is a part of a captive vapour recovery/tank vent system.
If absent, it is an open system and intended to vent to the atmosphere. Check the upper throats of the filler. A small hole. Free and cleat or clogged in whole or part?
Carl.
Lok under the right front wing. Is there a canister there? If so, it is a part of a captive vapour recovery/tank vent system.
If absent, it is an open system and intended to vent to the atmosphere. Check the upper throats of the filler. A small hole. Free and cleat or clogged in whole or part?
Carl.
The following users liked this post:
patpin (08-31-2016)
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#8
Just a surmise.
Lok under the right front wing. Is there a canister there? If so, it is a part of a captive vapour recovery/tank vent system.
If absent, it is an open system and intended to vent to the atmosphere. Check the upper throats of the filler. A small hole. Free and cleat or clogged in whole or part?
Carl.
Lok under the right front wing. Is there a canister there? If so, it is a part of a captive vapour recovery/tank vent system.
If absent, it is an open system and intended to vent to the atmosphere. Check the upper throats of the filler. A small hole. Free and cleat or clogged in whole or part?
Carl.
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