HI, I was reading the article on Fuel pressures for the VP44. I have a couple of questions.
My truck is a 1999 and has 87,000 miles, the stock lift pump went out in 07, 57,000 miles and was retrofitted with a new lift pump in the tank, along with a new filter assembly. The truck was running good, the other day I stopped for about 30 minutes got back in the truck, started right up idled perfect, but stumbled above an idle, so I idled home, changed the fuel filter, had a very hard time starting it. I primed the system about 5 times before trying to start it, it finally started but real rough. The next day I rented a fuel pressure gauge, I have 10 lbs at the filter, I checked fuel at the pump have fuel, no fuel except #4 injector, 12 volts at the VP44. 2-codes at first, PO252-P1688, now just the P1688.
So I was set to order a pump, then I wanted to check the pressure one more time, I still have 10lbs, but when cracking it drops off to 0, I thought the other day I had 10 lbs all the time, but not sure anymore.

Questions

1st the pressures listed in your article are those for the stock frame mounted lift pumps or the retrofitted one in the tank like mine.

2nd, should my pump be pumping when cracking, I know the pump comes on for only 30 seconds when you bump the switch, but how often does it run when the truck is running?

3rd, with the codes I listed does it sound as though the pump is dead, and do they go out like that?
 

DAP is a reputable dealer. I know one of their injection pump suppliers is industrial injection. The computers on top are new. The online vendor sounds like Blue Chip?? FYI I went through 2 Blue Chip pumps in less than a month. I now have an industrial injection that I am more than pleased with. Long story short, call DAP and get an injection pump lift pump combo. You won't be disappointed with service or quality

Thank You how long has your pump been in, I'm just looking for reliability, you say there computers are new, the place in CA puts rebuilt ones on top from Bosch, I do agree 1000, for the VP and lift pump is a great deal how do they do it

 

Thanks Dan

Thank You how long has your pump been in, I'm just looking for reliability, you say there computers are new, the place in CA puts rebuilt ones on top from Bosch, I do agree 1000, for the VP and lift pump is a great deal how do they do it

 

Thanks Dan

My DAP pump has been going strong for about a year. I have over 15,000 miles on it with no problems to speak of. They do use new computers on their pumps but I believe industrial injection is actually rebuilds the injection pumps for DAP.

As for how they can get you such a good deal, I am sure it all depends on the quantity they sell. I am sure they sell a ton of pumps so they get a good deal from their suppliers. Its all supply and demand. Industrial injection makes really good products too, if you were concerned.

(I am not totally sure if industrial injection is who actually rebuilds the pumps for DAP or not, just though I saw that they did somewhere)

Thank You how long has your pump been in, I'm just looking for reliability, you say there computers are new, the place in CA puts rebuilt ones on top from Bosch, I do agree 1000, for the VP and lift pump is a great deal how do they do it

 

Thanks Dan

My pump has been on for 2 and 1/2 months now. Not very long, but with 2 stroke and a good lift pump I plan on a long life out of this pump. I take this truck to the middle of no where snowmobiling, so I have to have reliablility. I've had no issues starting it in -15deg F when snowmobiling. Industrial makes quality products and DAP only sells quality products. You won't be disappointed! 

The majority of retailers do not build their own pumps, including Blue Chip. Here is a list of rebuilders that we know of.http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/25-fuel-system/247-bosch-certified-vp44-injection-pump-rebuilders

Dap also has good injectors and they are VERY good people to deal with.