I have a 2000 Dodge Cummins three-quarter ton long box has an air dog fuel system brand new RV 275 Bosch injectors new cold air intake valve lash recently set all new fuel filters cleaned map sensor  missing muffler and tailpipe from exhaust running 265 7516 No matter if I’m pulling a load or completely empty I average between 10 and 12 miles per gallon  90% highway miles  .  I have not had it into the shop 

OBDII coder reader will typically only provide error codes. 

 

OBDII live data tool typically will show all sensors it can plus error codes. 

 

Two tools that look nearly the same but are different in many ways.

I have had a though it could be a torque converter problem because if I’m a little stuck if I don’t put it in low 4x4 it will rev up and not transfer power to the wheels

Could also be clutch problems too. The direct and overdrive clutches could be worn too. 

So Trip to the tyranny shop check there first or find a shop that can do live OBDll live first

Both?

 

A transmission that is slipping excessively can produce excessive heat, work energy wasting in slipping parts convert work into heat and translates to lower MPG. 

 

OBDII live tool should be part of your home tool kit. Extremely cheap and work with most Smart Phones. Like I've got a OBDLink LX series which is sold for $49 on Amazon.

https://www.amazon.com/ScanTool-OBDLink-Bluetooth-Professional-Diagnostics/dp/B00H9S71LW/ref=sr_1_2_sspa?keywords=obdlink+lx&qid=1554436859&s=gateway&sr=8-2-spons&psc=1

 

Manufacture site.

http://www.obdlink.com/

 I ended up taking it in to a local diesel shop they told me that my used injector pump that I’ve had for four years is actually the wrong pump for the truck  and that that would affect the fuel mileage 4 to 5 miles per gallon 

I’m going to replace the pub and I will let you guys know if that fixes the problem

I think they're full of it, there is ho, so and some industrial stuff, if it runs good I wouldn't change pump. 

Have you checked for boost leaks yet, the entire system. 

They said it is only pulling 18 psi of boost and it sounds like a 12 valve now 

They checked for leaked and pressure and codes all is good

wrong pump is bs.  

 

 

sounds like boost leaks

He said it’s a 27 not a 29 and he thinks the key that’s in it is the wrong timing key

7 hours ago, Jesniccad said:

He said it’s a 27 not a 29 and he thinks the key that’s in it is the wrong timing key

 

The key number is stamped on the body of the pump and the key itself. It can be checked but it means removing the pump to see the numbers. 

He told me that the pump I have is for commercial and ambulance services and is not the right application but I could search around and find a different key that fits the pump if I can find one .you guys think it’s hog wash this theory? 

Just now, Jesniccad said:

He told me that the pump I have is for commercial and ambulance services and is not the right application but I could search around and find a different key that fits the pump if I can find one

 

I'm doubtful. I've seen guys pull bread truck engines and stuff them in Dodge body. They look the same and typically no big differences. The only thing is the Dodge ECM and PCM has to be used. The VP44 itself is a dumb pump. The PSG unit on the pump only has 3 jobs. 

1. Set fuel amount (duration)
2. Set timing (BTDC degrees)
3. Report any errors back to the ECM.

 

1850 rpms 71 mph 

More like 1900

 He told me my truck sounds more like a 12 valve not this nappy sound of a 24 valve  so he thinks that Paul is creating the wrong timing 

 He thinks it doesn’t have the snap of a 24 valve and the pump is creating the wrong timing 

Check the model number on the pump yourself and see what it says. AS I remember the last 2 numbers will tell you what pump you have. If my memory serves me the last 2 numbers is what you are looking for. 27 is an SO pump, 28 is and HO and 29 is for the industrial applications.That is if IIRC. 

18 psi of boost is not unusual for a truck that has no boost elbow on it. The stock waste gate opens in that general area, 18 to 20 psi. 

 The rpm still seems a little low for 70 but I dont remember how different the the OD gears are in the auto compared to the manual.

 That is how he found out I had a 29 is looking at the last two numbers and calling Bosch up 

 If I do decide to replace the injector pump what pump should I go with and who should I order from? 

Dap for the vendor and get a run of the mill sovp 

 

 

36 minutes ago, Jesniccad said:

 That is how he found out I had a 29 is looking at the last two numbers and calling Bosch up 

 If I do decide to replace the injector pump what pump should I go with and who should I order from? 

Earlier you said you had 27 and not a 29, thats why I mentioned it. Been this way since you bought it?

No  I replaced the pump about four years ago with a used one to get me by and I’ve put probably 4000 miles on it since then now I’m driving it 500 miles a week I noticed bad mileage 

In just 3 days I've clocked over 800 miles. This tank I'm figuring 21 to 22 MPG. 7 x 0.010 injectors and Quadzilla. It will be worth it to follow along for tour weekly mileage.