[QUOTE=jamesham;28768]Had this same problem on a 1985 motorhome that was based on a Ford Class C one-ton van chassis. Hired a local auto shop to pump out 45 gallons of gas and drop the tank. It was then cleaned out with water and solvent, and a gallon of liquid sealer was poured in to coat the bottom of the tank. After that dried, they reinstalled the tank, and filtered the fuel back into it. That motorhome had electric fuel pump inside the tank. They installed a large chassis-mount fuel filter at the back above the tank, and changed out the small factory fuel filter at the base of the carb. Never had any problems after that. Total cost was about $450, and that was 10 years ago.
IMHO this was NOT a DIY job. They had a forklift, 4 floor jacks, piles of concrete blocks, and 4 guys working together. There is some danger from the fuel, but they had a special electric fuel pump inside a plastic box that they used to transfer fuel in and out of any vehicle.
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Originally Posted by Lou29
I have a 1986 Gulfstream Sunsport 454ci. 60 gal. metal gas tank.
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I dropped it off at the shop.
I made the suggestion of dropping the tank and got an eye roll.
One guy suggested putting a large sediment filter before the mechanical fuel pump.
I'll let you know what they come up with.