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-   -   Carb Bowl Vent Solenoid (http://www.ifsja.org/forums/vb/showthread.php?t=187798)

aerocorey 10-10-2019 09:05 PM

Carb Bowl Vent Solenoid
 
Thinking bout using this in place of the carb bowl vent solenoid:

https://www.usplastic.com/catalog/it...x?itemid=85394

I'm thinking install it backwards so the direction of flow runs toward the carb, not toward the canister. With a 1 PSI cracking pressure, I think it would allow fumes to escape as desired when desired, but it would seat and effectively close the vent with the engine running.

No emissions inspections in my area. Just like trying to make things work.

Thoughts?

twmattox 10-10-2019 10:35 PM

It needs to vent freely when not running and be closed when running. From what I have read, if you can't find a replacement, it is just best to plug the vent to the charcoal canister. The carburetor will continue to vent inside the air cleaner; it just won't be captured by the charcoal canister.

aerocorey 10-11-2019 08:19 AM

Do you think the vent pressure would exceed 1 PSI?

tgreese 10-11-2019 10:27 AM

Quote:

Originally Posted by aerocorey
Do you think the vent pressure would exceed 1 PSI?

No. The bowl vents are always open to the air horn (top area of the carburetor, inside the air cleaner). When running, the solenoid valve is closed and the bowl vents are active. When the engine is off, the cold air door comes down to block the air cleaner snorkel, and the solenoid valve opens. The canister is now a less restrictive path for the vapors to vent, but no way is the air cleaner door going to seal enough to hold 1 psi of vapor pressure.

I think TW's advice is good - just block it and leave it in place if you need to retain factory appearance. If you worry, you could block open the cold air slightly and let the vapors from the bowl vents freely vent through the cold air intake.

acct21 10-11-2019 12:01 PM

Still available on eBay -- $20-40. Just search "bowl vent solenoid" and several Motorcraft pieces come up.

aerocorey 10-11-2019 12:09 PM

Quote:

Originally Posted by acct21
Still available on eBay -- $20-40. Just search "bowl vent solenoid" and several Motorcraft pieces come up.


I bought a few of them. Unfortunately they're all the wrong thing. They're advterised as "vent" solenoids, but they're actually"purge" solenoids... normally closed, energized open. The one on the bowl needs to be normally open, energized closed.

I found one that should work. Napa carries a vent solenoid and wiring pigtail for a mid-2000s Chevy truck whick is normally open and energized closed. Picking it up tonight.

chubbinius 10-11-2019 03:08 PM

Quote:

Originally Posted by aerocorey
I found one that should work. Napa carries a vent solenoid and wiring pigtail for a mid-2000s Chevy truck whick is normally open and energized closed. Picking it up tonight.

Cool! If it works, please share the part number and Napa name/number! Good luck.

GWNashville 10-11-2019 09:26 PM

Intersted in that number myself. Thanks

aerocorey 10-11-2019 09:31 PM

It works. I'm gross right now...will post update and part numbers soon...

aerocorey 10-12-2019 02:36 PM

Here it is:

https://www.napaonline.com/en/p/NDP6001628

It's large, but it works. The fittings are the same OD as the stock vent hose. I made coupling sleeves out of some larger diameter hose and snugged it all up with hose clamps. That's just what I had laying around. I'm sure it could be adapted better with a bit of glue and some plastic vacuum connectors.

The wiring pigtail is EC848. These are late '90s through I think 2010 Chevy/GMC parts, so I imagine they'll remain available for the foreseeable future.

Bob Barry 03-29-2020 12:49 PM

Nice find!

Thanks for the part #s.


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