That would depend on what size engine you have in the 2003 Ford E-150 :
GASOLINE engines
4.2L V6 ( 6 engine cylinders )
4.6L and 5.4L V8 engines ( 8 cylinders )
6.8L V10 ( 10 cylinders )
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There is also a 7.3L DIESEL V8 engine available ( 8 cylinders )
Bolt Pattern: 5-139
According to the 2003 Ford E150 owners manual : 5.7 liters ( 6 quarts - U.S. ) with oil filter change
On a 2003 Ford Windstar : The cargo area is behind the rear seat
The maximum cargo capacity of the 2003 Ford Taurus is 17 cu.ft..
The maximum cargo capacity of the 2003 Ford Focus is 42.54 cu.ft..
The maximum cargo capacity of the 2003 Ford Expedition is 110.5 cu.ft..
The maximum cargo capacity of the 2003 Ford Explorer is 88 cu.ft..
The maximum cargo capacity of the 2003 Ford Escape is 69.2 cu.ft..
The maximum cargo capacity of the 2003 Ford Mustang is 10.9 cu.ft..
Dump the gas tank out of it. the fuel pump there.
Drop the fuel tank down & change the pump.
Gas tank hope it is not full LOL