I spoke to moparman this evening as I was being tow-strapped back home from Melbourne to Orlando by my friend's Duramax. :duh:I had zero symptoms of any problem before this afternoon. While towing my fifth wheel camper home from a race, on flat, level ground as is usual for Florida, I had an instantaneous loss of power. I shifted into neutral and coasted the rig off to the shoulder, and tried to restart. It cranked endlessly but would not fire. I decided to crack the #1 injector open to see if I was getting any fuel, and saw none. Ditto cylinders 3 and 4.Then I cycled the key and verified that I could hear the lift pump operating, and could. I loosened the pressure regulator banjo bolt to see if fuel was getting to the pump, and plenty of fuel poured out. The only code I was able to retrieve from the "key trick" was a P1963.At that point I didn't know what else to do, so I called a friend with a hitch to come get the trailer, and we pulled the truck to a nearby Walmart to park it while we took the trailer home. After getting back to the Walmart several hours later, I attempted to start the truck and much to my surprise it fired right up. No smoke, no funny noises, nothing, until I gave it a little gas, and then it felt like it was completely defueling and wouldn't rev over 1200rpm from an idle of ~800.So, we strapped up and headed out. Getting strap-towed nearly 70 miles was a first for me, but it was uneventful. Now that it's home, I hooked up the autotap and got the following:P0251 P1689P1688So, is the IP toast like I think, or is it something cheaper and easier to fix?

251 is the internal mechanical pump failure.........sorry time for a vp44Other 2 codes are vp44 failure codes also.you can Get a package deal from several diesel vendors for an aftermarket fuel transfer pump and vp44. time to do some shopping.

Yeap... Confirming W&F the error codes are all death codes... Time for a VP44 P0251 /threads/2573-P0251-Fuel-Inj.-Pump-Mech.-Failure-Fuel-Valve-Feedback-Circuit">http://forum.mopar1973man.com/threads/2573-P0251-Fuel-Inj.-Pump-Mech.-Failure-Fuel-Valve-Feedback-Circuit P1688 /threads/2627-P1688-Internal-Fuel-Injection-Pump-Controller-Failure">http://forum.mopar1973man.com/threads/2627-P1688-Internal-Fuel-Injection-Pump-Controller-Failure P1689 /threads/2628-P1689-No-Communication-Between-ECM-and-Injection-Pump-Module">http://forum.mopar1973man.com/threads/2628-P1689-No-Communication-Between-ECM-and-Injection-Pump-Module Like we talked on the phone about marginal fuel pressure and it effects now you seeing the codes. The "Binary" on off problem is the P1688 and P1689...

hello and welcome to the site!!

--- Update to the previous post...

i see that you don't have your sig filled out...so if you have the stock lift pump..it needs to be tossed and get a good pusher pump.fass and airdog come to mind because they have a lifetime warranty..3/8's or 1/2" fuel lines and put it on a 2 cycle diet..1 oz. to 1 gallon is the correct ratio.with doing all of this there is a day and night difference and you will be glad that you did this.

Get a fuel pressure gauge also.

I have in fact had it on a 2-stroke diet, although nowhere near 1oz/gal. I had been reading elsewhere that people were doing something like 6-8oz/tank, so that's what I was doing. I have the stock, block-mounted LP, so it never even had the factory "upgrade" or whatever it's called done to it...

At 200:1 ratio the HFRR score is low any ways... That why the 128:1 ratio was taken because it exceeds the orignal requirements for fuel lubricity by Bosch...

I'm pretty sure 128:1 is less than 400 HFRR socre...

200:1 Ratio scored a worse case at 474 HFRR...

Todays fuel at ~520 HFRR which is marginal at best!

Then...

yes i agree with w&f you need a good lift pump, new vp, fuel pressure gauge, and a 2 cycle diet. i think over at diesel auto power he has some package deals with a new vp and lift pump! good luck:)