12v MPG - Dodge Cummins Diesel Forum

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post #1 of 20 (permalink) Old 03-11-2012, 10:49 PM Thread Starter
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12v MPG

so i have a 95 2500 cummins with 3.55 gears and a k&n air filter (drop in). their is no mods done to this truck, but i think someone has played wit the star wheel. im not a heavy foot driver i just recently put 150 miles on my truck city and highway mixed and i only got 10.23 mpg. the highest i ever got was 12 even all highway. can their be a major problem with my truck?


1995,2500, 4X4, AUTO, 3 INCH STRAIGHT PIPE, #10 Fuel plate, KDP Tapped, AFE Stage 1 Intake System, silencer ring M.I.A. NEXT:5 inch turbo back with 6 inch tip,tint windows,paint, and body work.
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post #2 of 20 (permalink) Old 03-11-2012, 10:53 PM
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Thats horrible. Check for a leak. My 92 WIF censor o-ring leaked till I found it.

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post #3 of 20 (permalink) Old 03-11-2012, 11:00 PM
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check for boost leaks by all the couplers, intake, turbo ect.

06 Mega|69SXE/83mm|RKL Trans|DDP Super Mental Injectors|AD-200|PPE Dual CP3/dmax pump|Bully Dog Custom Tune||On3 Intercooler|Fleece Coolant Bypass|901HP/1690TQ 12.56@98MPH
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post #4 of 20 (permalink) Old 03-11-2012, 11:02 PM Thread Starter
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Quote:
Originally Posted by Dans12v View Post
Thats horrible. Check for a leak. My 92 WIF censor o-ring leaked till I found it.
i have benn looking i think i have found a small leak on my injection pum, but i dont know how to tighten it up, is thier a special way to do so?

ive uploaded a pic where is seen some fuel possibly leaking out of.

1995,2500, 4X4, AUTO, 3 INCH STRAIGHT PIPE, #10 Fuel plate, KDP Tapped, AFE Stage 1 Intake System, silencer ring M.I.A. NEXT:5 inch turbo back with 6 inch tip,tint windows,paint, and body work.
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post #5 of 20 (permalink) Old 03-11-2012, 11:03 PM Thread Starter
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Quote:
Originally Posted by alwayscummin94 View Post
check for boost leaks by all the couplers, intake, turbo ect.
well if i did have a boost leak wouldnt m boost gauge be off? i can hit 27 boost np.

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post #6 of 20 (permalink) Old 03-11-2012, 11:04 PM
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Go through and check to make sure all the nuts and bolts are tight.

97 2500 CCLB 223k, he351ve man cont, 4", airdog, 51" donaldson
2012 QCSB 2500 g56 35k stock, first clutch at 25k, second at 35k. SAC is horrible
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post #7 of 20 (permalink) Old 03-11-2012, 11:07 PM Thread Starter
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Originally Posted by Dans12v View Post
Go through and check to make sure all the nuts and bolts are tight.
well i will tommorow today i degreased my engine and washed it so ill look tommorow if i see any leaks, i just want better mpg lol.

1995,2500, 4X4, AUTO, 3 INCH STRAIGHT PIPE, #10 Fuel plate, KDP Tapped, AFE Stage 1 Intake System, silencer ring M.I.A. NEXT:5 inch turbo back with 6 inch tip,tint windows,paint, and body work.
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post #8 of 20 (permalink) Old 03-11-2012, 11:07 PM
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it wont affect the readings at all of the gauge. I use a rubber end cap then put a tire stem through the middle of it so i can pressurize the system with an air compressor. I have found leaks in so many small places that i would never have found.
v

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post #9 of 20 (permalink) Old 03-11-2012, 11:12 PM
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Check your timing

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post #10 of 20 (permalink) Old 03-11-2012, 11:14 PM Thread Starter
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Quote:
Originally Posted by alwayscummin94 View Post
it wont affect the readings at all of the gauge. I use a rubber end cap then put a tire stem through the middle of it so i can pressurize the system with an air compressor. I have found leaks in so many small places that i would never have found.
v
ill have to try this. thanks. my buddy has a 92 12v and he never goes below 20mpg.

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post #11 of 20 (permalink) Old 03-11-2012, 11:34 PM
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As said above, check your timing. Also the injectors might be due for replacement based on the miles. If its an auto, they don't due the greatest. Get a lower stall tc and shift kit, that will help a bit.

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post #12 of 20 (permalink) Old 03-11-2012, 11:42 PM Thread Starter
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Quote:
Originally Posted by jtheado View Post
As said above, check your timing. Also the injectors might be due for replacement based on the miles. If its an auto, they don't due the greatest. Get a lower stall tc and shift kit, that will help a bit.
Well I only have 165000 miles on it and yeah it's an auto and it's going to need to be rebuilt because its really bad

1995,2500, 4X4, AUTO, 3 INCH STRAIGHT PIPE, #10 Fuel plate, KDP Tapped, AFE Stage 1 Intake System, silencer ring M.I.A. NEXT:5 inch turbo back with 6 inch tip,tint windows,paint, and body work.
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