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You might get better help in the Econoline section of this forum.
1983 E-350, is a Econoline.
Most likely it's a sending unit problem. However it being a motorhome, Ford only produced the Chassis as an incomplete vehicle, and the motorhome company finished it. No way to really tell where Ford left off or where the motorhome company came in.
It's most likely ford did the fuel system complete but no way to be sure.
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