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Unread 03-31-2005, 03:57 PM   #1
buddy2003
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Changing Gas Filter = Big mpg improvement

I recently changed the gas filter (and took the roof rack off). I have a 1996 4.0L, 5spd with 160k miles. The filter looked like it was original (I've owned the jeep for 18 months). I was amazed by the brown crap that pured out of the upstream side afer I took it off.

Before the change, I was getting around 19 mpUSgall. I've just put the first tank of gas through it and was surprised to see that the gas mileage has improved to 23 mpUSgall (highway commuting).

Anyone else seen a similar dramatic improvement?

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Unread 03-31-2005, 04:21 PM   #2
crashod
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I haven't done this yet, but I have an 88 with an inline filter. Is that the only one that I need to replace? Mine is a Napa filter, so I know it's not the original. I'm getting 15 to 18 mpg... or 200 to 265 miles on my 16.5 gallon tank. Another thing, I'd like to upgrade to a 20 gal tank... What all do I need to replace to do that? Thanks
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Unread 03-31-2005, 04:28 PM   #3
wipedawg
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i believe in the newer motors... to replace the filter you also hafta replace the fuel pump... basically i dont think the little bit better in gas mileage is gonna be worth the time and money of a new fuel pump.
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Unread 03-31-2005, 04:46 PM   #4
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im thinking of replacing my inline with a permanent mount for a spin on filter... just gotta decide which to use.. anyone know what the fuel flow is like outta a 90 fuel pump?
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Unread 03-31-2005, 04:49 PM   #5
crashod
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Something in the relm of 45 to 60 psi..
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Unread 03-31-2005, 05:40 PM   #6
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If you want to seell the rack drop me a line.
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Unread 03-31-2005, 05:59 PM   #7
88eXcellentJeep
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Quote:
Originally Posted by wipedawg
i believe in the newer motors... to replace the filter you also hafta replace the fuel pump... basically i dont think the little bit better in gas mileage is gonna be worth the time and money of a new fuel pump.
r u 4 real, thats soo stupid...were the chrysler engrs smokin crack or what??
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Unread 03-31-2005, 06:21 PM   #8
twisted_ed
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actually its rather ingenius if you think about it, they know that most people that know nothing about a vehicle know that filters need to be changed and it will be so easy for chrysler to convice them that fuel filters need to be changed very often, and since the fuel pump needs to be replaced thats a good way to make lots of exta dough especually since you have to drop the tank which can take a long time!! and shop labor aint cheap we know that.

Ive seen filter kits on ebay to replace the filter on the pump so you dont need to buy a new one, i bet at any rate you could take the pump out and remove the old filter and rig it to run without one, then get an inlie or spin on filter to put outside the tank like the old one then you never have to worry,
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Unread 03-31-2005, 07:00 PM   #9
CowboyPA
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Actually if you re think about it it is a very good idea.. Jeep is one of the few who are filtering the fuel BEFORE it runs through the pump.
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Unread 04-05-2005, 02:08 AM   #10
88Chief
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Quote:
Originally Posted by buddy2003
Before the change, I was getting around 19 mpUSgall. I've just put the first tank of gas through it and was surprised to see that the gas mileage has improved to 23 mpUSgall (highway commuting).

Anyone else seen a similar dramatic improvement?
Don't want to rain on your parade, but is it possible that you're in an area where gasoline is oxygenated for winter and you've just gotten a tank of the summer version? The mileage change you describe would be just a bit high for that alone, but would account for a lot of it.

88Chief
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Unread 04-05-2005, 10:41 PM   #11
smac999
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Quote:
Originally Posted by CowboyPA
Actually if you re think about it it is a very good idea.. Jeep is one of the few who are filtering the fuel BEFORE it runs through the pump.
cars with inline filters still have one on the pump. well atleast my last one did.
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Unread 04-06-2005, 12:58 PM   #12
88eXcellentJeep
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Yea i know some cars have filters before the fuel pump and some even in the tank(also STUPID). I guess you can call it smart from a caniving *******-make more $ kind of view point but I still think its inefficient and a PITA. That is pure profit engineering NOT design engineering.
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Unread 04-06-2005, 01:39 PM   #13
t bell
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Well if you think about it, a filter before it goes to the pump-so it will not tear up the pump. And a filter before it goes to the engine-so it will not tear up the engine. Although changing a filter in the tank is a more PITA, it should help for a long lifed pump, in theory. Whether or not Jeep engineers were thinking of that, I don't know.
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Unread 04-06-2005, 02:46 PM   #14
88eXcellentJeep
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Yea, thats the way it should be...but no filters in the gas tank for pump itself
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Unread 04-06-2005, 03:06 PM   #15
RCHavok797
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Quote:
Originally Posted by 88Chief
Don't want to rain on your parade, but is it possible that you're in an area where gasoline is oxygenated for winter and you've just gotten a tank of the summer version? The mileage change you describe would be just a bit high for that alone, but would account for a lot of it.

88Chief
I would say since brown junk came out of his fuel filter then most likely the increase in gas millage was do to the new fuel filter.
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