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Locking Fuel Caps & EVAP system 900

posted by  B.B. on  Wed Mar 30 07:10 CST 2022
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

Hi Ian,

"BB - I believe the fuel tanks are always vented to atmosphere in some way either through a vented cap or a designed vent system? They should never have positive pressure internally?
Please correct me if I'm wrong here!"

That's a good question that led me off to learn about the EVAP system.
In one post:
https://www.brickboard.com/RWD/volvo/1272348/940/960/980/V90/S90/troubleshoot_evap_systm_failed_ca_smog_test.html
The author indicates that the fuel system is sealed, and shows how a pressure
test starting at the filler cap can reveal failed fuel/vacuum lines leading
to failing the CA smog test and probably dumping fuel overboard.
He says: "the release pressure of the gas cap is about 3.6 psi"

Other posts indicate the tank pressure may vary positive and negative
depending on conditions.

One of nice replies to the EVAP post was from kittysgreyvolvo that offered more info:

Fuel Evap Test Failure: 1993 Volvo 240:
https://www.brickboard.com/RWD/volvo/1554479/fuel_evap_test_failure_1993_volvo_240.html

Failed Gas Cap AND Failed EVAP Canister Check Valve ..... with Images .... 200:
https://www.brickboard.com/RWD/volvo/1620115/220/240/260/280/failed_gas_cap_evap_canister_check_valve_images.html

Gates hose not the best quality yet may be more convenient to find. At least the Gates PCV and EVAP vapor line.

Info for charcoal canister / EEC replacements ... 200 1989
https://www.brickboard.com/RWD/volvo/980660/220/240/260/280/info_charcoal_canister_eec_replacements.html

Checking the EVAP system is on my to-do list when it warms up.

Cheers, Bill






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New Locking Fuel Caps [900]
posted by  B.B. subscriber  on Tue Mar 29 13:40 CST 2022 >


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