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1. Buy a Cummins B series engine manual and troubleshooting and repair manual.
2. This site has all the info you need.
3. Good hand tools and info above ,you will do just fine working on you own engine.
4. The vans depending on size and what gears they are around 17-19 mpg hwy .If you add a OD and or change gears ,mid 20's will be top's do to the size .

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