What does old nasty fuel affect?

I have a 1985 Porsche 911 with very low mileage. This vehicle has been in storage for many years. I got it started.. It runs, but has no power under load. My initial guess is a fuel related concern..Any ideas what old, nasty fuel would effect?

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[Casey at Pelican Parts]

Sometimes it is not just the fuel that can cause issues on cars stored for long periods of time. First step, clean the top of the fuel tank near the fuel level sending unit with air, remove the fuel level sending unit and look inside the tank for any rust or debris. IF you find debris the tank must be removed and either replaced or sent out to be refurbished. If the tank looks like new inside, the fuel could potentially have gummed up the injectors (rare without misfiring), fuel pump, and filter. I have, on a number of low mileage cars, seen fuel pumps causing this type of issue, shortly before they completely fail causing a no start issue. What is your fuel pressure at idle?

- Casey

[reddogmotrsprts]

Although it's rarely a major problem, I don't think bad fuel is worth messing around with. We drain it from tanks where it has been sitting for a year or more and pour it into my employees' cars -- I wouldn't touch the stuff but they can't get enough!

If I diagnosed varnishing throughout the fuel system, I might throw a can of BG-44K at the problem first -- critically, only in a full tank of fresh fuel -- before throwing money into parts. This is something to do after you change the oil -- and you should plan to change the oil again immediately after the treatment.