Diesel Bombers
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Diesel Bombers (https://www.dieselbombers.com/)
-   24 Valve 2nd Gen Dodge Cummins 98.5-02 (https://www.dieselbombers.com/24-valve-2nd-gen-dodge-cummins-98-5-02/)
-   -   Horrible mileage!! (https://www.dieselbombers.com/24-valve-2nd-gen-dodge-cummins-98-5-02/84839-horrible-mileage.html)

four_wheel_n 10-26-2011 02:39 PM
Originally Posted by Scott@Alligator (Post 811472)
Yeah im thinking the vp is weak, but if you are looking for more mileage as well the rv275 injectors would be a good choice as well
What are some symptoms of the vp44 going bad besides bad mileage?

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And is there an alternative for the vp44?

GuyWithA24Valve 10-26-2011 03:37 PM
Originally Posted by four_wheel_n (Post 813481)
What are some symptoms of the vp44 going bad besides bad mileage?

---AutoMerged DoublePost---

And is there an alternative for the vp44?
Low power, possible codes.

The only alternative is an aftermarket (hot rod, monster) which can still fail, or a P-Pump swap from a 12 valve cummins

jyatesmp 10-31-2011 09:45 AM
Originally Posted by shakenbake (Post 811681)
I'm right with you guys in the poor mileage club, gonna change the fuel filter tomorrow and hopefully that will help some. Getting 10 mpg around town is aggrivating. :dang:
wow I thought I had it bad.... 12-13.5 no matter how or what road I drive...:argh:

Ive had the stock LP and IP replaced with no change... I think they are out again and going to upgrade this time to see if this helps...

hope we can figure this out:pca1:

01quadcab 10-31-2011 11:01 AM
Originally Posted by shakenbake (Post 811681)
I'm right with you guys in the poor mileage club, gonna change the fuel filter tomorrow and hopefully that will help some. Getting 10 mpg around town is aggrivating. :dang:
even with my compounds and 683 racing all day i never got that low. i dont see a fuel system in your sig hope you have one or you may be losing injection pump. had a buddy loose his injection pump and with new pump get horrible mileage turns out in some cases it hurts the injectors. he swapped out with a set of injectors I had and his mileage was back to normal.

shakenbake 11-05-2011 01:22 AM
yea it has a fass hpfp lift pump on it. the injection pump looks to be newew also. it has 6/21/11 engraved in the side of it. just filled back up tonight and got 12.6 mpg on that tank. still seems lower than it should be though...

01quadcab 11-05-2011 11:06 AM
Originally Posted by shakenbake (Post 817013)
yea it has a fass hpfp lift pump on it. the injection pump looks to be newew also. it has 6/21/11 engraved in the side of it. just filled back up tonight and got 12.6 mpg on that tank. still seems lower than it should be though...
what gears are in your truck? are your tires larger than stock and have you had the speedo reset? That could be some of the issue. How many miles on the truck? Had the valves adjusted at all?

shakenbake 11-10-2011 12:45 AM
3.55 gears, 285/70/17 coopers, to the best of my knowledge speedo is at factory settings (only owned it for about a month and a half) 261,000 miles. Not sure last time valves were adjusted. How bad is it to adjust valves on one of these?

pukie370 11-10-2011 12:56 AM
dont forget big tires and a lead foot kill milage. also if you have 410 gears you cant go over 60 mph without killing milage.

diesel life 11-11-2011 09:32 AM
I thought mine was bad!!! I get around 15mpg back and forth to work on the highway with a stock ip and stock lp with 170,000 on the truck its an 2001. installing air dog 150 and edge juice/attitude with the cts this weekend hopefully that brings it up some... let us know what you figure out to be bad

shakenbake 11-15-2011 09:16 PM
Any more suggestions? Been getting a pretty steady 12.5 mpg lately...:argh:


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