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Gas millage dropping down from 18 MPG to 15 MPG

Indyharleyguy

Active member
Steel Soldiers Supporter
218
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Location
Carmel IN
Hi all my 1984 CUCV MPG has dropped for no apparent reason. I've replaced the air cleaner but not the fuel filter. I'm thinking
about taking a almost new fuel filter off a non working CUCV that maybe had 1000 miles on it before it was totaled and putting it on my running CUCV. I was wondering if that was a good idea or not?
 

WWRD99

Well-known member
1,166
1,797
113
Location
York Pa
My experience with an old fuel filter. My son bought a 1009 last year...dragged it out of the woods. Sat since 96. When I pulled the fuel filter off the mount it still had clean red diesel in it. That being said it depends on how long yours sat plus if it had bio diesel in it. That can mold up. If you're in a cold area try some kind of dejelling stuff. All of mine jelled up with the 5 degree days we had. All took some 911 then ran fine.

Sent from my SM-S906U using Tapatalk
 

Barrman

Well-known member
5,296
1,870
113
Location
Giddings, Texas
Did you lock your front hubs in for driving in the snow? I agree about the filter not causing a mpg drop. There is more drag somewhere. Hubs locked, sticking front caliper, parking brake hanging on and similar.
 

biscuitwhistler37

Well-known member
326
954
93
Location
Michigan
There's debate about failing glow plugs causing decreased fuel economy as well, I don't think it would be as substantial as 3mpg seeing as they're only supposed to kick on upon startup and something like 3 minutes into cold idle, but maybe. Check the wheel bearings as well, and "goofy" stuff like tire pressure, hopefully it's something simple.
 
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