93 Legacy gas cap?

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icrman
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93 Legacy gas cap?

Post by icrman » Sun Apr 29, 2018 10:56 pm

So it looks like its vented. So is the tank pressurized or vacuum on these cars? It seemed like a vacuum the other day with original cap and today pressure with new after market cap. It was running like fuel starvation a few days ago. There just isn't much info about this any place. I'm thinking the cap allows air in the tank but not out.

Legacy777
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Re: 93 Legacy gas cap?

Post by Legacy777 » Tue May 01, 2018 5:35 pm

The caps work like any other gas cap, the cap prevents vacuum by letting air in when vacuum develops in the tank. The FSM states this; check out page 20 of 336.

http://www.main.experiencetherave.com/s ... and_Elect/

If you were having vacuum issues then the old cap might be bad.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

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icrman
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Joined: Mon Apr 16, 2007 12:55 am
Location: Near Seattle wa

Re: 93 Legacy gas cap?

Post by icrman » Fri May 04, 2018 8:50 pm

Yeah that is normal, just never know about these things. The pump would be fighting a vacuum.

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