I do not want to change the tank on an 85 SE even though I'm replacing the gas engine with a diesel. I've consider the many years it has set with ethanol and know it's dried and consider that the diesel will eventually dissolve the residue.

I've speculated on pouring something in there to dissolve some or most of the amber type buildup left when ethanol dries but I'm concerned that some of the solvents may damage the diesel engine.

Is there a practical way to remove some of the buildup while the tank is in the car without risking damage to the diesel?

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84 300SD
85 380SE
83 528e
95 318ic