2000 dodge diesel ram 2500 6 cyc 5.9 L truck willonly start once in the morning!! Assuming lift pump is ok, injector pump is ok, why would it start only once then not the rest of the day? what does temperature have to do with the truck not starting? Is a pusher pump a good idea to upgrade this fuel system? Help please, my truck is stranded in a parking lot!!

 

if your lift pump is dead (or going dead) be careful because on those VP pumps when the lift pump goes it can and will take out the VP pump and increase repair costs. you can go a few ways

intake pump retro kit which the dealer is going to charge you a crap load.

OR

FASS has a nice replacement pump which is a direct swap for your factory block mounted pump.

 

The circut board on the VP can become heat soaked and cause the pump to not work.

You mean it will crank and not start, or won't crank at all?

Look up blue chip diesel, they have a GREAT write up on VP44's. If you don't see it, let me know, I have it book marked on my PC at home.

 

When I fill the tank with diesel fuel it foams up so much in the filler tube, I cant even turn the gas pump on fully. Why does this happen and does this cause air to get into the system? Could my problem just be a vapor lock? Crappy gas?

 

It will crank and not start after it starts once ok in the morning. I am going to google the info you mentioned.

 

diesel foams natually. moreso in the summertime but its what it does.

 

Here's that website... http://www.bluechipdiesel.com/vp44diagnostichelp.html

 

quick VP44 heat soak test.

If the truck won't start hot, open the hood, and pour a bottle of water over the top of the VP, where the electronics are housed, then try starting it. If it fires, you have a board that is going south, and will be replacing the VP pump shortly.

I know this is a rather barbaric test, and some will tell you not to do it, for fear of screwing something else up. But the reality is, the truck isn't running anyway....

Too many VP's later

 

Did you check for any codes? Key on key off key on key off key on. Code for pcu and ecu will apper in odometer. if it comes up with numbers it will point to a problem. If it say done for both pcu and ecu it is good news.

 

Thanks Madhat for the link, VERY informative. Sometimes when I turn the truck off I can hear the lift pump buzzing..it stops after 10 or 15 seconds. Is this normal? Or is it contributing to the problem of the truck not starting? Also, Is the foaming of the fuel normal? I can barely fuel it up without it filling up the filler tube with foam. It has never done this before...

 

P-1693
P-done
Any ideas?

 

Just for the heck of it try undoing your fuel cap each time you stop and see if it keeps starting for you. I'm thinking it might not venting properly and drawing down a vacuum.

 

P1693 is the companion code. It means that there may be another code stored and you need to use a OBDII scanner to read it.

 

if its not venting properly, what would cause this? would the fuel pressure regulator at the top of the gas tank be responsible?

 

I'm trying to remember, I can't off the top of my head, but I believe the fuel cap is pressurized, and there should be some roll over valves on the top of the truck. I have some pics of a second gen tank at the house, I'll look and see.

As far as the fuel foaming, I would try filling a little slower. When does it do it?