vp 44 are a weird creature my 98.5 had one installed at 98000 then 8 months later at 110000 and i had a pusher pump on it

If u want to rid urself of pump troubles install a fass

 

I started asking around and I talked to a buddy of mine who runs heavy equipment. He said that hes absolutely positive that its the Fuel filter!. And when I think about it that makes a whole lot of sense. Not to mention the fact that ive never changed it, and the previous owner probably didnt knowing them. On the way home from school last week (almost 500 miles) it started doing the same thing again however it didnt take all the power away. Going through the mtns in NC, going up the long hills it would all the sudden feel like I only had 50% power and the truck would slowly loose RPMs. Then about 45 seconds later it would come back just as quickly as it left. So tomorow im going to put a new filter on and see if that doesnt improve my problem.

 

I'm sure your filter should be changed but I fail to see how it would affect the idle speed. Mine did the same thing after a long run, it would idle higher than normal. It would lose power and go to an idle while driving along at cruise speed. After a while, it died and would not run at all. Replaced the VP-44 and all this went away. Been fine now for over 200K.

 

Well I know on a gas engine if you lean the mixture it will idle up. I dont know as much about diesels, but I dont dont see any reason why a diesel would not act the same. (less fuel=faster and hotter fuel burn). Was the fuel pump that you replaced in your truck stock?

 

actually a diesel is exactly opposite, less fuel equals lower rpm and a cooler exhaust temp,

 

Hmm. Well I gues im pretty wrong. I apreciate your answer though. I wonder if there isnt some kind of feature that if the engine starts getting starved for fuel that it gives it too much. As we just learned I cant fix it unless it has spark plugs. But im still gona replace the filter and pray that it fixes it. (Off course it wont with my luck). Im going to take it to a really good diesel mechanic soon. You guys wana take bets to see what the problem is hahaha.
-Fuel filter
-IP
-LP
-TPS
-Other

 

good luck finding a good diesel mechanic, Here's my advice there are many guys on here that know more about the 5.9 than many of the techs that work in a dealership..

My advice is to get a fuel pressure gauge on it, change the filter seeing as you dont know the current history of the truck, pull the codes, clear the codes, drive it again then check codes, as you could have had history codes and not current codes. If the 0216 returns start saving for a VP, the blue chip link I posted should help you narrow it down,

 

Ok I will do that. There is a good mechanic in Knoxville TN where I live. They work mainly on heavy equipment. If nothing else I will just get their opinion, it may be easier for them to diagnose a problem if they can touch it.

 

Well it turned out I had a fuel pressure from the lift pump of 5 psi, and it dropped down to zero under a load. Apparently, someone has converted my stock lift pump configuration to one with with which the lift pump is actually inside of the fuel tank. Anyways we went with the solution of adding a normal lift pump where it would normally be and leaving the the one in the fuel tank as well. With the new configuration I know have 18 PSI after the lift pumps. I also put a low pressure warning light in incase it ever hapens again.