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97 legacy outback fuel system issue.

4 messages,  Last post on Mar 03, 2012 at 4:23 PM

You are in the Subaru Legacy & Outback Forum.

What is this discussion about? Subaru Legacy, Subaru Outback, Subaru, Sedan, Wagon

Messages Page 2 of 2

#2 of 4 Re: 97 legacy outback fuel system issue. [dimebag922] by propwash49

Feb 26, 2012 (6:32 pm)

Replying to: dimebag922 (Feb 26, 2012 8:18 am)
This is just a thought, but it may be worth a try. Next time it stalls out on you, remove the gas cap and put it back on. If you hear a loud hissing when you open the cap, then you have a fuel venting problem. As the engine burns fuel from the tank, that fuel has to be replaced by air. With current emissions regulations, you just can't vent the tank to the atmosphere. There is a one-way valve which will allow air into the tank, but not allow fumes to escape into the atmosphere. If that vent malfunctions and does not let air into the tank, the fuel pump can't keep supplying fuel against the vacuum being created in the tank. Even if you don't hear anything when you remove the cap, try to start the engine again. If it starts and runs for another short time before stalling, then you have an issue with your tank venting system. Good luck.

#3 of 4 Re: 97 legacy outback fuel system issue. [propwash49] by dimebag922

Feb 28, 2012 (2:22 am)

Replying to: propwash49 (Feb 26, 2012 6:32 pm)
ill give that a try. i never thought of that. makes sense tho since when the car does die off if i let it set for a few hours it will start up and run alright for a short time.

#4 of 4 Re: 97 legacy outback fuel system issue. [dimebag922] by dimebag922

Mar 03, 2012 (4:23 pm)

Replying to: dimebag922 (Feb 28, 2012 2:22 am)
no luck =( ran fine for a day then did the same thing.. took another day for it to run alright enough to get it home. i think im going to try just replacing the whole unit. found the sending unit and pump at a pick a part for 50 bucks. is there anything else that could cause the pump to just randomly die off and be a pain in the..... and needing a day or so to smarten up so it will run good for a day or 2?

Messages Page 2 of 2

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