What is your question? What does it do? does it turn over? Does it have spark? Is it getting gas? We can help but we need you to be more specific.
passengerside back of the motor
According to one of the Ford websites : For a 1992 Ford E-350 , 5.8 liter / 351 cubic inch V8 engine : ( the spark plugs are gapped at .044 inch )
inside the fuel tank
There are more than one transmission for these trucks and vans but if they are the same model (C6, EOD examples) then yes.
E-350
on the 1992 e-150 the tank is 35 gallons and on the e-350 it is 45 gallons
Could be fuel injection or spark
no
Yes, but it may have to go on a diet and lose some weight first.
A Ford E-350 is a ( 1 ton van ) * passenger and cargo versions were made , etcetera
Check your alternator belts. Might be slipping or broke.
The Ford E-350 is a one ton van and the Ford F-350 is a one ton pickup truck