How to change vacuum pump on 1990 dodge 250 diesel

SOURCE: removing speedometer 1992 dodge ram 250

I don't know if it's the same as my D150. But it's pretty simple:
1) remove about six screws from under the upper lip of the dash face bessal and one under the overhand above the radio.
2) carefully jimmy the bessal straight out. It has about four spring trim-clips that will release under pressure.
3) this exposes the speedometer instrument cluster. It is one big assembly (speedometer, fuel, temp and elctrical guages, etc) attahed with about six #2 phillips face screws. Remove these.
4) There are three back contections on the cluster: two electronic and one mechanical. Carefully start to pull the cluster out along the steering column until you see the shift indicator control line ( a small fishing-line with a hook on the end) attached to a small steel flang on the base of the steering column. This can be unhooked with your fingers or needle-nose pliers.
5) as you pull the cluster further out you can reach behind and unplug the two electronic connections. The round one simply pulls straight out. The last (rectangular) one has a pinch latch you need to compress to allow the plug to come out.
your finished!

SOURCE: 1990 dodge ram 250 318

Hi,

We have fixed such problem by replacing the ISC (idle speed control) motor.

Please get back to us if you have any further query or else accept the solution.

Thanks for contacting fixya.com

SOURCE: replace the fuel pump on a 1990 dodge ram 250

99% of all fuel pumps from 1987 on, are in the fuel
tank
Remove the tank or tip up the box,your choice