I need to replace the Vacuum pump in my Dodge Cummins, the dealer wants $1200 to do it, I can buy a rebuilt one for $350. I would like to do it myself but I would like some step by step instructions. Are there any good websites that I could use that would do this?

actually mine is the 12 valve, vacuum pump should be very similiar

Try Ehow.com. Absent that, try a search with the question you posed. I have been fixing more stuff that I thought I could never fix by just searching with the how to question. Good Luck!

Go to the nearest library and zerox the appropriate pages out of the Chilton Manual.

http://www.cumminsforum.com/forum/89-93-tech-articles/1760-if-youre-vacuum-pump-springs-leak.html

and more on that site.

TDR... Turbo Diesel Registery.com

Should have all the info.

Is the pump not pulling vacuum or is it leaking oil. I have never seen one fail but I have seen hundreds of them leak oil. If it is just leaking oil the seals and o-rings can be replaced. Not too hard to do yourself if you are mechanically inclined. Parts are available from the dealer and if I recall they are under 100 bucks.

Just checked with my parts dept, dealer price is $117. Or you can go to a Cummins dealer, bring your engine serial # and they cn fix you up for under $20. I have personally done this repair and have never seen a vac pump wear out. hope this helps.