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I just dropped the tank- I didn't like the idea of cutting up the car's floor pan, and my SHO is undercoated so rust wasn't an issue. The whole process took me about 2 or 3 hours, but I'm not a particularly fast worker (ie... it took me 4 or 5 hours to rewire a stereo harness and install an electronic oil pressure gauge last weekend on my Talon.) Most people recommend the access door because it makes the job easier if you have to do it again, and there is a good chance you will destroy your tank taking it out if your car is rusty (the straps eat through the tank.) I didn't clean the inside of the tank at all - maybe I should have....
My advice if you do want to drop the tank: hook a piece of hose to the far end of your fuel filter for a gas can and short the fuel pump test pin under the hood, then turn the car on. That way you can drain the tank almost completely before starting.
Where is the fuel pump test pin at? I would really like to run this check prior to dropping the tank. Also if you were to replace the old tank, would you choose a 16 gallon or 18.5?
either size fits, SHOs came with the 18.5,
the fuel pump test pin is with the test connector near the pass side firewall