Just curious, but what is the corelation between a dirty fuel filter and MPG? I have heard this before and was trying to figure out how it affects mileageMine is way down. I'm going to try switching the fuel filter out, and I've had my foot in it A LOT more with the new trans. But I hit an all time low of 14.6mpg which is not cool, so I'm hoping a new fuel filter will help me regain some of that
hopeful 6.0 said:Just curious, but what is the corelation between a dirty fuel filter and MPG? I have heard this before and was trying to figure out how it affects mileage
I don't know how it'd effect a PSD. But the trucks running the VP44 have to really watch it because of the obvoius reasons but also Cummins says that timing advance ,on a VP44, is dependent on the amount of fuel pressure it has. Anything else I really couldn't say.sstockton said:You know, I'm really not sure. It has to be some sort of restriction or extra strain on the system that causes it. Because when my fuel filter gets clogged, my power falls off, the smoke isn't as thick and my milage drops too. I think running the bio-d pushed a lot of junk out of my tank and clogged the filter pretty quickly this time around.
Bouncer said:I know mine is a 12v, but I have lost between 3-4mpg so far. This has been the biggest drop I have witnessed in 6 years of having a Cummins powered truck. I am not sure if it is dumb luck or they have done something different to the fuel this year.
I guess it could very well be this is the first full Winter of nothing but ULSD Winter blend at the pumps. I never really thought about that, but you are right as they were phasing LSD out.Phily 911 said:They could be doing something different. Last year they were still phasing out LSD.
No... CETANE RATING is RAISED!Bouncer said:They use a different additive package with anti-gel properties in it. Also the Cetane rating I believe gets lowered somewhat as well. Anyhow you get less BTU's out of a gallon Winter fuel than you do a gallon of non-Winter fuel. More BTU's equal more MPG.
Mopar's Web site said:There is no benefit to using a higher cetane number fuel than is specified by the engine's manufacturer. The ASTM Standard Specification for Diesel Fuel Oils (D-975) states, "The cetane number requirements depend on engine design, size, nature of speed and load variations, and on starting and atmospheric conditions. Increase in cetane number over values actually required does not materially improve engine performance. Accordingly, the cetane number specified should be as low as possible to insure maximum fuel availability." This quote underscores the importance of matching engine cetane requirements with fuel cetane number!!!
Well now that Mike has made me look like a clueless arse again, there is the right info. ointlaughMopar1973Man said:No... CETANE RATING is RAISED!
The high the cetane the easier to ignite the fuel but ther lower the BTU's become more energy it has... Chevron here in Idaho is running roughly 47-48 CETANE but during the summer its down around 41-43 CETANE...
Always remember that high the cetane levels are always used in the winter time... That why you MPG numbers are falling...
There is roughly 147,000 BTU in summer blend #2 diesel
There is roughly 139,000 BTU's in winter blend #1 diesel...
All current cetane additives hav less than 20,000 BTU's when added to fuel... The reduces the BTU's greatly and increase the CETANE rapidly...
Relax... :bow:Bouncer said:Well now that Mike has made me look like a clueless arse again, there is the right info. ointlaugh
I will go climb back under my rock now. :thanks:
Then they blend in things like naptha, xylene, and mineral spirits to reduce the auto-ignition temperature of the fuel to ease starting of the engine on cold winter mornings...sstockton said:As I understand it, diesel is a paraffin based fuel, essentially wax. During the winter the wax tends to crystallize plugging things up, so the winter fuel is made with a lower percentage of paraffin, to keep this from happening. Since paraffin is the source of power, a lower percentage means less potential energy, and fewer btu's released when burning it, which results in less power and lower fuel economy.