MCHAM Posted December 10, 2011 Share Posted December 10, 2011 Will a truck burn more fuel and smoke going down the road when it's time to replace fuel filters? Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/ Share on other sites More sharing options...
dirtywhiteboy Posted December 10, 2011 Share Posted December 10, 2011 no,...the older the filter the less it will flow..... Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-93440 Share on other sites More sharing options...
Bollweevil Posted December 10, 2011 Share Posted December 10, 2011 not enough air, due to restricted air cleaner will do that. If it' s really restricted, you could convince yourself that the turbo is bad. Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-93455 Share on other sites More sharing options...
slpwlker Posted December 10, 2011 Share Posted December 10, 2011 Could be a Charge air Cooler also. But this past 2 months my Mileage has gone to hell in a hand basket. New Cac,Filters,air and fuel,checked all tires. Adjusted my driving habits. Starting to think either the new CAC has a damn leak or this winter blend crap the refineries are putting out has dropped my loaded mileage by 200 miles or more a tank Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-93459 Share on other sites More sharing options...
Underdog Posted December 10, 2011 Share Posted December 10, 2011 My guess would be the winter fuel. Not much you can do about it til spring. I use Howe's year round and it helps fuel mileage, but always a noticeable drop in MPG between October and March. Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-93477 Share on other sites More sharing options...
Lmackattack Posted December 10, 2011 Share Posted December 10, 2011 First thing I look for when I have bad MPG is what is my Boost vs EGT readings. Its a good indacation how your air fuel ratio is doing and if your down on power. Restricted fuel flow does not really hurt MPG. Restricted air will reduce power. If you have low boost you have a leak or clogged fuel filters. low EGT tells me it is not getting the fuel it needs.besides that winter blend fuel will reduce your MPG. Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-93483 Share on other sites More sharing options...
slpwlker Posted December 10, 2011 Share Posted December 10, 2011 My problem is I had a CAC leak and had about 10 pounds lower boost. around 28 to 30 psi. my egt's climbed.Now I got a new CAC but still seem alittle low on boost and my egt's are still higher then normal if I really start working the motor. HAd to keep backling out of it to stay below 900 degrees. yesterday continued on my bounce from Houston to Decatur,Il and still have around 1/4 tank or so Also didn't idle thursday night. Was running between 58 to 60. then kicked up to about 65 which has me turning around 1500 rpms. Just trying to keep the boost low. Idk other then to change hoses on the turbo and i have found 2 times I have had to retorque the clamps on the turbo hoses atleast 1/2 turn Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-93499 Share on other sites More sharing options...
Mack Doctor Jr. Posted December 11, 2011 Share Posted December 11, 2011 U might get some soapy water in a spray bottle and spray all ur joints with the truck running. My old man used to find cac air leaks by spotting dirt lines on your steel piping where the rubber joints clamp down. Just a couple things to try... Later ~Joe Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-93644 Share on other sites More sharing options...
Harry John Posted December 21, 2011 Share Posted December 21, 2011 Just put a little auto trans fluid ( ATF) directly into the air in take. It wont hurt anything but will smoke like crazy. Quote Link to comment https://www.bigmacktrucks.com/topic/22037-fuel-mileage/#findComment-94899 Share on other sites More sharing options...
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