4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Fuel Filter

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Old Jun 5, 2008 | 10:07 AM
  #11  
1vryfststang's Avatar
1vryfststang
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Default RE: Fuel Filter

ORIGINAL: sxynerd

ORIGINAL: 99GTKevin

think thats why im gettin 12-14 mpg in town and 17 on highway?
nope... it's more of the case that the filter would have been letting crap through and clogging and gunking up the injectors. Fuel pressure is what ensures fuel delivery and if the filter is dirty it still lets the presure build... Down and dirty elpanation.

<-Yup.....
Old Jun 5, 2008 | 03:53 PM
  #12  
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jrherald420
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From: Smyrna, TN
Default RE: Fuel Filter

its reccomended to change it every 30,000 miles
Old Jun 5, 2008 | 04:43 PM
  #13  
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jwarner0297
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From: KS
Default RE: Fuel Filter

ORIGINAL: 99GTKevin

i got to looking under my car and i noticed that my fuel filter looked like it had never been changed and i have 99,5XX miles on my car..uhh is this bad..the clamp was a pain to get off it was so rusted and the fuel lines would not come off after 15 min of pulling( i have the disconnect puller) now what
Using those plastics fuel line tools for the filter can be a pain, and the lock clips that are on the fuel lines might be stiff. I would try it again and when you get the plastic tool over the filter inlet/exit tube push the filter and the fuel line towards each other then push the tool into the fuel line (it takes using both hands to do all this) Once its into the fuel line it may take some GENTLE convincing, but i would try again many people have problems with it.

Depressurize the fuel system prior
Old Jun 5, 2008 | 05:11 PM
  #14  
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Default RE: Fuel Filter

will fuel spill out once i get the line off?
Old Jun 5, 2008 | 06:21 PM
  #15  
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jwarner0297
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From: KS
Default RE: Fuel Filter

yeah, even after depressurizing and for safety reasons disconnect your neg. battery terminal. But yeah its not a lot of fuel as far as volume but try not to have your eyes right below it. When I did mine 3 weeks ago i was surprised at how much came out considering the fuel filter is at the highest point between two fuel lines.
Old Jun 5, 2008 | 06:32 PM
  #16  
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mcgilvrey007
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From: Texas
Default RE: Fuel Filter

try getting an air hose and blowing out the connectors, thats what helped me
Old Jun 5, 2008 | 07:29 PM
  #17  
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Default RE: Fuel Filter

how do i depressurize it. Sorry bout the stupid questions im 17 and just learning how to do all of this.
Old Jun 5, 2008 | 07:42 PM
  #18  
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lilc1511
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From: mn
Default RE: Fuel Filter

ORIGINAL: sxynerd

ORIGINAL: 99GTKevin

think thats why im gettin 12-14 mpg in town and 17 on highway?
nope... it's more of the case that the filter would have been letting crap through and clogging and gunking up the injectors. Fuel pressure is what ensures fuel delivery and if the filter is dirty it still lets the presure build... Down and dirty elpanation.
Wrong. actually any blockage in the fuel filter or fuel lines for that matter will cause bad gas mileage and lower fuel pressure. if let go long enough it can even cause the car not to start, though that is pretty extreme... it is not an issue of the filter letting things through... it still filters and keeps things out, it is just harder for the fuel to get through all the **** in the filter hence lower fuel pressure HENCE lower gas mileage, YES this will definately affect gas mileage. and yes, i am very willing to argue about this .

Actually when i worked at ford we recommended fuel filters every 15k... and im pretty sure that is correct. it is the same at gm where i am currently employed. you do not HAVE to depressurize. though it is recommended so fuel does not spray all over... depressurization is easy.. use a rag and press the schrader valve on the fuel rail until it stops spraying (do not have thekey in the ignition or the fuel pump will try to keep the system pressurized.

ok, this is how you get it off... put the tool in there and push it in, then pull the filter toward the tool and pull the line. should come right off, lotsa times they are rusty as hell and you have to wiggle it all around, try spraying some rust penetrant in there if its really bad...
Old Jun 5, 2008 | 07:44 PM
  #19  
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lilc1511
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Default RE: Fuel Filter

and disconnecting you battery terminal is jsut a waste of time...
Old Jun 5, 2008 | 08:14 PM
  #20  
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jwarner0297
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From: KS
Default RE: Fuel Filter

ORIGINAL: lilc1511

and disconnecting you battery terminal is jsut a waste of time...
I know however, I don't want to give advice on something and leave anything out so I included disconnecting the negative terminal because "its what the manual says to do" but yeah it is a waste.



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