Hi
I have a 1997 ram van b2500 v6 that just stopped running. fuel pressure gauge says zero. It will run with starting fluid. I assume it is the fuel pump and buy one. opps. bad idea to assume. now I am looking for the wires that power the pump. Looking at the connector that snaps into the pump connector there are four wires. on the left there two (blue and a black) and the right there are two (black/white stipe and a green). I would like to know which is the power and ground for the pump. I believe the other two are for the fuel level sensor. I've attached a pic.
thanks

 

Dark Green 12 volt positive to pump motor.
Black ground for pump motor.

Have you check the fuses and relay in the PDC for the pump? Find the fuel pump relay and jump slot 30 with 87 and see if the pump works. If so then the problem is up in the PDC.

Pin 30 12+ all times
Pin 87 jumps with pin 30 when relay activates transferring 12+ to pump
Pin 86 hot with key.
pin 85 ground by the PCM to turn the pump on and off.

 

thanks for that color info. So I have power at the connector. I dropped the tank again and pulled the pump and set it under the van in a bucket. someone cranked the engine and I laid under the back and did hear the pump spinning. Now I am a bit confused where to go with that. What will allow the pump to work but stop the pressure from reaching the fuel rail where the pressure gauge is connected?

 

How much gas is in the tank? If less than 5 gallons then there is not enough fuel to get the system restarted.

 

I will slap my self several times if that is it. I only put 3 gallons back in the tank. thanks I'll put it back together and see how it goes with more gas,

 

Why??? is there a switch that shuts off the power or is it because the fuel is to low to pick it up via the pump??

I am asking because mine has loss all spark at the engine after I drained the fuel tank. don't know why yet.

 

Low fuel will not cause a loss of spark.