Run the fault codes
indicates a problem ambient or baro sensor that reports to the ecm so that it knows what fuel setting is required for starting and running the engine
nothing to do with the fuel pump
SOURCE: 93 subaru legacy starting problems
Probably a short or loose connection between battery and starter motor, or on either end of cables. Id look there before swapping out starter.On cold days you might put a heater under car for a few hours before using it,do this carefully as to avoid a car fire, or look into a block heater for your engine.
SOURCE: fuel pump not running only in cold weather
how cold is it? below 32 degrees any water in your fuel will turn to ice the particles could clog your filter or freeze in the line try adding adding liquid heet its isoppropyl alcohol it will help
SOURCE: 1991 subaru legacy. The car would not start. I
You should have a fuse & a relay. Check # 11 fuse it should be 15 amp.& may be for your fuel pump. Do you have owners manual by chance, or does cover of fuses have label?
SOURCE: warm weather starting problems
Not to put firestone down but how intricate was this diagnostic that they preformed? It sounds like they just plugged into the OBD2 port and looked for any codes in the history.
You may be right, it may have to do with temperature. But I'm thinking more in the respect of a faulty sensor that is changing with temperature. That is, if it has to do with that.
The other thing is the fuel-pump. Has it been tested?
If possible, When this no start situation occurs, investigate it. Find out if you have a no-spark or no-fuel situation.
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