Huge MPG drop. Not injectors!? - Dodge Cummins Diesel Forum
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post #1 of 10 (permalink) Old 07-19-2011, 11:48 PM Thread Starter
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Huge MPG drop. Not injectors!?

Hey guys.

03 Cummins. In the last few weeks I have dropped down to a measly 8MPG. Truck has Edge on Lvl2, Amsoil Air Filter (blown out very recently), OFG not too long ago and a fuel filter only 12,000km ago with the next one due this weekend.

I was towing a light load, only 6k pounds. Usually I get at least 16MPG towing this. I tow this trailer on the exact same route at least twice a month.

Injector return test is only 100ml/minute. Which tells me its not injectors leaking. Truck seems to have power, but seems a tad sluggish above 2k with a load. Almost like it wont rev up enough.

There are no fuel leaks. Ran it for 20 minutes in same spot and let it sit in the garage overnight. No leaks.

I am up for ANY and all suggestions. Thanks guys. Have to drive 4000km in 3 weeks and want to get this solved somehow.

Thanks again.


2003 Ram 3500 - SO, Smarty POD, Edge Juice w/att, Magnaflow 5", Volant Intake, BD exhaust Brake, 5" RC with extra 1.5" F+R, stock auto ---> 6 spd and SoutBend 3250DD
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post #2 of 10 (permalink) Old 07-20-2011, 12:22 AM
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Have you checked for codes?

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post #3 of 10 (permalink) Old 07-20-2011, 02:35 AM Thread Starter
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No codes. Very strange

2003 Ram 3500 - SO, Smarty POD, Edge Juice w/att, Magnaflow 5", Volant Intake, BD exhaust Brake, 5" RC with extra 1.5" F+R, stock auto ---> 6 spd and SoutBend 3250DD
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post #4 of 10 (permalink) Old 07-20-2011, 03:49 AM
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injector return test only measures amount returned to the fuel tank by each injector return valve, does NOT affect fuel mileage. if excessive, will lower rail fuel pressure and lower performance.

do NOT rule out leaking injector nozzles. do you have any white smoke with raw diesel smell in exhaust at cold start up or while running?

has the black exhaust smoke increased?

rail pressure? if low, can be leaking nozzles.

max. boost pressure? if low, can be boost leak or problem turbo.

blowing out a turbo charged diesel engine air filter is like letting your Cummins have unprotected sex with an old diseased junker diesel. fractures and micro tears the filtration media fibers.
Dirt/air is pulled thru the tear holes by the turbo, may as well not have a filter.

think Cummins with AIDS.



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Last edited by steelhead01; 07-20-2011 at 03:57 AM.
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post #5 of 10 (permalink) Old 07-20-2011, 04:16 AM
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Wow steelhead really freaked out a bit at the end with the aids reference and all haha. But I totally agree steelhead is dead on here an injectors return test means absolutely nothing when it comes down to ur injectors firing corectly and really even if ur not smoking at all this is screaming injector issues (or four flat tires) take those injectors out and ship them off to be bench tested. And check ur oil for diesel in it for that much of a drop in mpg ud have diesel in ur oil for sure and id think defiantly enough it'd show up on ur oil level and the old napkin trick too.

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post #6 of 10 (permalink) Old 07-20-2011, 11:25 AM Thread Starter
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Crap.

I have been watching the oil level like a hawk for weeks and it hasnt moved at all. Maybe a mm and that is down.

No white smoke, definately doesnt seem to be excessive black smoke either. Truck hits 24psi as it has since I have owned it for the last 3-4 years. Will hook up the Solus and go for a drive today to check rail psi. Thanks.

As I recall the proper procedure for cleaning amsoil air filters is....

Ea Air Filters should be cleaned every year or 25,000 miles, whichever comes first. Carefully remove the filter from the housing. Clean the housing with a shop towel, being careful not to knock contaminants into the air inlet. Filters can be cleaned by carefully vacuuming the filter media on the dirty side, or by holding the filter with one hand and carefully blowing the filter media at a 45-degree angle on the clean side using low-pressure shop air (15-20 lbs. psi).

Is that incorrect?

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post #7 of 10 (permalink) Old 07-20-2011, 12:31 PM
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I love how steelhead01 always has sexual references.... cracks me up every time.

That seems low for a fuel filter clogging. At least check lift pressure when you are checkin rail pressure.

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post #8 of 10 (permalink) Old 07-20-2011, 04:38 PM
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Hi, I'm having the same issue with the mileage dropping. I have a 2007.5 6.7, airdog 165, grid heater delete, GPD Mega-Flo S-3 6.7L Cummins Intake Manifold.
Iím also getting P000F DTC, FUEL SYSTEM OVER PRESSURE RELIEF VALVE ACTIVATED
I have noticed more black smoke.

Any ideas?

Mike
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post #9 of 10 (permalink) Old 07-20-2011, 09:15 PM Thread Starter
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Well the truck rarely seems to get over 22k rail pressure. I thought it would be a tad higher than that myself.

Something that has only happened a handful of time now, when say passing someone on the highway at high rpms sometimes when I let off the rpm will hang; not come down as quick as it should. Not sure if it might have anything to do with it but it is what it is

Open to any ideas at this point

Thanks again

2003 Ram 3500 - SO, Smarty POD, Edge Juice w/att, Magnaflow 5", Volant Intake, BD exhaust Brake, 5" RC with extra 1.5" F+R, stock auto ---> 6 spd and SoutBend 3250DD
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post #10 of 10 (permalink) Old 07-20-2011, 09:35 PM
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Still saying injectors ur throttle hangs from the extra fuel being leaked into the cylinder being fired off which makes it act like there is more throttle that what ur giving it.

2004.5 3500 4x4 NV5600, PDR Cam, ARP 425s, industrial injection 60 horse injectors, Raptor 100 fuel pump, DIY 2micron fuel filter system with big line upgrade, HE351 over S475,more brewing
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