318 drinking gas like hell

Any information beyond "318 in my dodge van" would be helpful

please state the year of manufacturer and vehicle tare weight.

Please state any and all known modifications including but not limited to
Camshaft, Intake manifold, Cylinder heads, Fuel pump, Pistons, torque converter etc.

The more information you can provide to us, no matter how seemingly unimportant. The more accurately we can help you diagnose a fault.

If it is a standard unmodified motor and I had to take a guess I would be looking for a vacuum leak.