help lost fuel mileage
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New User
Joined: Dec 2010
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From: Chanute
help lost fuel mileage
Ok so I have a 93 4X4 extended cab non turbo with 339,891 miles on it. I was getting 16 mpg now it's down to almost 9. The injection pump was rebuit a year ago just before I bought the truck. So we put a new fuel pump on. Then we put new injector's in, to our surprise they was the factory one's. That got it to 10.5 mpg. Noticed the timming marks on pump was not lined up. To our suprise the nut's was loose. So we fixed that but all that done was fixed the black smoke problem. So why can't i get better fuel mileage. Please email me at dusty.finley@yahoo.com sorry not on the computer very much. Well please help me.
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
first,do you actually see a tag on the ip with a build date,to verify it has been rebuilt/replaced?
when you change ip and or injectors,the engine needs to be timed.
unlike modern engines,we have no computer to automatically adjust our timing.it has to be checked and adjusted every 20k miles or so using a diesel timing meter.
simply matching up the lines will not work.in fact,iv read that's not all that close as it should be either.
it's enough to drive the engine to a shop with the correct timing meter.
welcome to FTE.
long idle time warming up the truck will hurt fuel economy,as well as deflated tires as well.when the temps drop,so does tire pressure.inflate them to max.
winter blend fuel also doesn't help much.
keep your air filter and fuel filter clean.
keep the water drained from the fuel filter.
use a lubricity supplement/injector cleaner.
but likely engine timing is your biggest problem right now.
when you change ip and or injectors,the engine needs to be timed.
unlike modern engines,we have no computer to automatically adjust our timing.it has to be checked and adjusted every 20k miles or so using a diesel timing meter.
simply matching up the lines will not work.in fact,iv read that's not all that close as it should be either.
it's enough to drive the engine to a shop with the correct timing meter.
welcome to FTE.
long idle time warming up the truck will hurt fuel economy,as well as deflated tires as well.when the temps drop,so does tire pressure.inflate them to max.
winter blend fuel also doesn't help much.
keep your air filter and fuel filter clean.
keep the water drained from the fuel filter.
use a lubricity supplement/injector cleaner.
but likely engine timing is your biggest problem right now.
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New User
Joined: Dec 2010
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From: Chanute
Yes it has a tag so i called the people who done it and they told me when and the millage it had 600 miles on the ip when i got the truck. It runs awesome but just gets 10.5 mpg what the heck happen? Thanks
Fleet Owner
Joined: Jul 2006
Posts: 20,359
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From: Mi'kma'ki
when you tightened up the ip,did you line up the timing marks or leave it where it was? (don't worry,there's no right or wrong answer to that.)
call around the local diesel mechanics and ask them if they have a meter for timing the first diesel engines put in chevy and ford.
ask what kind of meter they have,what method of timing they will use,what setting they will set the engine to,and of course what they will charge.
call around the local diesel mechanics and ask them if they have a meter for timing the first diesel engines put in chevy and ford.
ask what kind of meter they have,what method of timing they will use,what setting they will set the engine to,and of course what they will charge.
Logistics Pro
Joined: Sep 2007
Posts: 3,737
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From: Western Mass
I'll second the winter fuel drop. I was getting 16 or so, then it dropped to mid 14's. I do have to check my tire pressure though. Around the same time it started getting cold, I got new tires. But I don't want to run them at max pressure, that wore the centers of my old ones down before the outsides, and I really don't want to ruin some new tires that way.
Junior User
Joined: Apr 2009
Posts: 71
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Don't expect to recoup any milage come next summer. The epa has done away with #2 diesel perminatly and for someone that goes through about 2500 gal a month typicaly in the summer that is not fun...
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Logistics Pro
Joined: Sep 2007
Posts: 3,737
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From: Western Mass
I know the ULSD has less power than the old stuff, but the old stuff has basically been gone for several years now except for some offroad uses. My understanding for some of the mileage loss is because kerosene (aka #1 fuel oil/diesel) is blended in during the winter to prevent or lessen fuel gelling. In the spring when it warms up again, there isn't a need for the blend, so then the mileage will go up a little again.
Also ULSD = #2 diesel, at least thats my understanding. The number (#2) has to do with the distillation of crude and has nothing to do with the EPA or any of its regulations. All the EPA has done is told us we need to use #2 diesel with less that 15ppm of sulfur. (which has been around for a couple years now....)
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Junior User
Joined: Apr 2009
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Yeah low sulfer has been around for 3 years now but the fuel depot o go thru told me that someone i think it was the epa but some government agency made last september the last time summer grade diesel would be produced. That said I hate to say it guys but my next truck will have spark plugs. Im away from home right now but when I get back i will gather more info on it.
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
Where is home?
#2 diesel will be here for a long time.
Then again, give the EPA any more control and there will be no automobiles, no electricity, no roads, no homes, no fires, no agriculture ,no dams, no manufacturing.
#2 diesel will be here for a long time.
Then again, give the EPA any more control and there will be no automobiles, no electricity, no roads, no homes, no fires, no agriculture ,no dams, no manufacturing.
Logistics Pro
Joined: Sep 2007
Posts: 3,737
Likes: 179
From: Western Mass
I'd say that what happens in Alaska might not be the same as what happens here in Massachusetts. I know it gets warm in the summers up there, but with all the other winter issues and difficulty in moving supplies around, it might make more sense to just run the same fuel year round in Alaska. But I can't see any reason it would make any sense at all to run winter blended fuel in like Florida in the summer.
Edit: read here for more information on Alaska's fuel distribution http://www.dec.state.ak.us/air/anpms/ulsd/ulsdhome.htm
Apparently I was right, and the push in Alaska is to whenever possible use only one blend of ULSD due to the unique distribution and infrastructure of the state and its isolated rural communities. This summer was the big transition.
Edit: read here for more information on Alaska's fuel distribution http://www.dec.state.ak.us/air/anpms/ulsd/ulsdhome.htm
Apparently I was right, and the push in Alaska is to whenever possible use only one blend of ULSD due to the unique distribution and infrastructure of the state and its isolated rural communities. This summer was the big transition.
Last edited by tecgod13; Dec 23, 2010 at 10:58 AM. Reason: google searching!
Junior User
Joined: Apr 2009
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Yeah thats the same story I just got from my fuel guys yesterday. Lame looks like I need to buy a 20k gal fuel truck and haul up from the lower 48. I have heard idle talk about there being a diesel lower on the refinement prosses thus being a little thicker and more btu's for lack of more knowledge I will call it #3 I wonder If you could run that in anything over say 65 above?
