You wont find a manual for the Mark III because its an aftermarket unit, you will have to utilize a Haynes Manual for an Econoline Van...Hope this helps
How do I replace the heater core in a 1999 Ford e150 conversion van
The weight of a 1999 Ford E150 van can vary depending on the specific model, trim level, and options. Generally, the curb weight ranges from around 4,500 to 5,000 pounds.
6x8
if 4,6L Color is usually yellow or red egr - under manifold in rear O2 - rear back in axhaust manifold
I too have an E150 from 1995 and the fuse box is hidden behind a wooden panel on the driver side wall just ahead of the first captains chair.
put the bigest battery that will fit
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In the fuse box.
you have a bad fuel pump
engine bay near battery
120 lbs.