Winesalot

Deleted dumb question.

Thanks for all the great relies. I am working a series of night shifts this week so Friday will be the first day I am able to get under the truck. I'll report back on my findings.

That seems like what may be going on for me. I have used 4wd several times in the last few months and it sure felt like I was getting what I needed at the time. In this case my front wheels were not able to move at all once the rears started slipping. I assumed that when the 4wd indicator came on on the dash that it was engaged but I guess that is not the case. Hopefully I will have time tomorrow to do some investigation on the front end.

Thanks to both of you for the quick response. Yes, my cruise control works normally.

Yesterday I was trying to pull my loaded trailer out of a snow covered driveway. I spun the tires in 2wd so I moved the transfer case shift lever from 2H to 4H but the front wheels did not spin on the snow while the rears were spinning. I shifted to 4L and same thing. I have no knowledge on these truck as far as the 4wd system. Any thoughts or hints on what might have happened and how I should proceed from here?

Put the new pump in on Friday and drove the truck all day Saturday with no issues. Problem solved.

Update: Yesterday I installed the pump relay per , thank you IBMobile. Other than it was a pain in the *** to cut, strip, and connect to wires down by the lift pump this was an easy project with your post. After installing the relay the truck and lift pump started normally 5 or so times so I decided to take it for a test drive. After stopping at a friends it had zero pressure on the lift pump when I went to leave. I limped it home and got our my electrical meter and both the lead to the relay from the ecm and the lead to the pump from the relay had 14+ volts. I am guessing that I have an intermittently bad pump.

I agree. I bought a relay today and I'll get it installed in a couple of days when I get done with night shifts. Hopefully that solves my problem. If not, having the wires from the ecm and to the pump with easy access will help with diagnostics.

Smoke was coming from exhaust pipe and it was blueish. Do you think the cold weather and thicker diesel could cause the increased load on the pump? I am installing the relay set up in the referenced thread before I drive it again.

This is an edit on what I wrote below: There is definitely something wrong in the pump controls which must mean the ecm. I started thinking about the transmission phantom shifting problems these truck have when the alternator is leaking ac current in to the dc system. That has been happening to me occasionally. I decided to clean my battery terminals as they needed it and can be a contributing factor to the power/ecm issue. I then started the truck and had no problem with the lift pump cutting out for 15 minutes then it shut off again. I pulled up the electrical schematic and found the positive wire to the lift pump split in to two wires that both go in to the ecm. I am really not sure what to do about this. I have a Raptor FRRP-100 lift pump which works great up to now and is plugged in to the stock wire loom connector. Today I was driving along cheerfully when I lost power and started smoking. I noticed my fuel pressure to the injector pump was 0. I was fairly low on fuel so I limped in to the fuel station and filled her up. When I started it I had pressure so I assumed it was just a low tank and cold diesel. A few minutes later same thing happened so I limped it home. I am now finding that sometimes when I start it I have pressure and other times I do not. The times I do have pressure it doesn't last long before the pressure drops off. I am feeling that this is an electrical issue, not a mechanical pump issue. I did consider that maybe my low tank clogged the fuel filter but it looks great. There is no in between with the pressure, it is either on or off which is what I think it is electrical. I am not sure where to begin on troubleshooting this thing. Any thoughts? 2001 Dodge Ram 2500 4x4, Auto Transmission, stock all the way except a set of gauges (Fuel Press, Trans Temp, and EGT) and a Raptor FRRP-100 lift pump.