1931 Gas valve removal

[John Kuhnast]

Planning on removing the under hood gas valve on my 1931 and polish the seat to stop some seepage. Can I just unscrew it from the engine side or is it necessary for someone to hold it under the gas tank? i.e. a two man job.Thanks

[Big hammer]

Indented late 31 firewall, one man from the firewall side.

[Tom Endy]

You will need a 3/4" crows foot to get it off and on. The valve screws into a boss, nothing to hold.

Tom Endy

[MikeK]

You will likely find that late '31 horizontal tube quite encrusted with sediment. It won't simply flush out. I have a scraper made from a cheap extra long screwdriver with the end 1/8" bent over 90 degrees. I got a mountain of crud out from several late 31 tank pipes with it. I followed with a .38 cal bronze bore brush, a thread chaser, and a thorough flush.

I have counter-bored the inlet hole on several late 31 valves to accept a 3/16" brass tube stub that serves as the base for an inlet screen made from 80 mesh bronze screen rolled 1/4"D x 4 1/2"L. It fits easily into a clean '31 tank tube and is much larger in available surface area than the short fuel valve inlet screens sold by the vendors.

[John Kuhnast]

Thank you

[Brentwood Bob]

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Mike. Where did you find the brass screen? McMaster-Carr?
Thanks, Bob

[MikeK]

Originally Posted by Brentwood Bob

Mike. Where did you find the brass screen? McMaster-Carr? Thanks, Bob

Although I live 15 minutes from the McMaster-Carr warehouse pickup window they do not have 80 mesh, or anything either cheap or with a sufficient % open area. Here's a link to an 80 mesh 6"x6" brass screen piece, 45% open, less than $6 including shipping: LINK That should make several.

[Tom Wesenberg]

I used to take the fine brass screen out of old automatic tranny filters, but with Mike's link, it just isn't worth the time and trouble to do that.

[Brentwood Bob]

thanks,
Bob