Performance & Brainstorming Want to free up some HP? Looking at headers? Ask your performance related questions here!

Fuel Filter Change-MPG Drops

  #1  
Old 01-06-2013, 08:26 PM
Beginning Member
Thread Starter
Join Date: Jan 2012
Posts: 24
jdog2pt0 is on a distinguished road
Default Fuel Filter Change-MPG Drops

Title says it all. After replacing my water pump (damn you Dex-cool ) I decided to change the fuel filter since I had no idea when it had been done last, if at all. However, almost immediately after my mileage dropped. I used to get 16-17mpg consistently, but it then dropped to 13-14.

Stick with me here. The first tank after the change was a measly 13, then my dad needed my truck for a time, so the second tank (I'd driven it some, then him) was a poor 13. However after the second tank (my dad was driving it daily and I was using another truck) he managed to get 18mpg for two-three tanks. I got it back, got 18 from the tank he put in it, then 14, and 13 after that. Now, I know you're thinking I must be too aggressive on the throttle. Thing is though I eased up a lot to try to keep the 18 going (I rarely get past 2500 rpm on accel).

Leak? Not sure. I can't smell gas, don't see any spots, but I haven't put a lot of effort into looking yet (it's cold in Utah). If it is leaking it's not at the filter (I was a little rough with the lines which is why I'm wondering if I eff'd something up).
 
  #2  
Old 01-06-2013, 08:42 PM
Super Member
Join Date: Mar 2012
Location: Iowa
Posts: 1,024
50lb_cat will become famous soon enough
Default

Start with a fuel pressure and leakdown test. With the key on and engine off, it should be between 60 and 65 and not go below 55 for 10 minutes. Post back your initial psi and 10 minute later numbers.
Are you letting it warm up longer than he is? Do you drive more city than him?
 
  #3  
Old 01-27-2013, 12:22 AM
Beginning Member
Join Date: Dec 2012
Location: Pennsylvania
Posts: 10
Lushikute is on a distinguished road
Default

You put your fuel filter on backwards...
 
  #4  
Old 01-27-2013, 10:59 AM
neo71665's Avatar
Super Member
Join Date: Dec 2007
Location: rison AR
Posts: 1,940
neo71665 will become famous soon enoughneo71665 will become famous soon enough
Default

He running good gas with no ethanol and you running cheap mixed crap? Even with 10% crap in my trucks the mileage drops.
 
  #5  
Old 01-27-2013, 01:08 PM
richphotos's Avatar
Super Moderator
Join Date: Dec 2011
Location: Minneapolis, MN
Posts: 4,861
richphotos is a jewel in the roughrichphotos is a jewel in the roughrichphotos is a jewel in the rough
Default

Originally Posted by neo71665 View Post
He running good gas with no ethanol and you running cheap mixed crap? Even with 10% crap in my trucks the mileage drops.
Do you know if Holidays mix with ethenol?
 
  #6  
Old 01-27-2013, 04:02 PM
New Member
Join Date: Feb 2012
Location: Arkansas
Posts: 51
igs4dragon8 is on a distinguished road
Default

Funny I get 22-23 MPG every day 2x4
 
  #7  
Old 01-27-2013, 04:56 PM
neo71665's Avatar
Super Member
Join Date: Dec 2007
Location: rison AR
Posts: 1,940
neo71665 will become famous soon enoughneo71665 will become famous soon enough
Default

No clue about holidays, we don't have em down here. I do know they post yellow stickers on the pumps here saying may be up to 10%. My blazer would labor knock like crazy on it and get crappy mileage with the 2.8 and 3.4 unless I ran mid grade. With no mixed I could run low grade just fine. My 91 doesn't seem to care. I have to pay about 3 cents more a gallon for good gas but being able to run a lower grade without issues made up for it.
 
  #8  
Old 01-27-2013, 05:15 PM
Blazin00LT's Avatar
Starting Member
Join Date: Oct 2012
Location: Greenfield
Posts: 241
Blazin00LT is on a distinguished road
  #9  
Old 01-29-2013, 05:56 PM
Beginning Member
Thread Starter
Join Date: Jan 2012
Posts: 24
jdog2pt0 is on a distinguished road
Default

Originally Posted by Lushikute View Post
You put your fuel filter on backwards...
Not possible.

Perhaps it's a ****ty filter though?

In regards to the ethanol, the 10% is all I've ever put in it. Never really paid it any mind, but I'll look into it some more. I had some issues I brought up in another thread, but that turned out to be bad plugs. So I changed those out, but the mileage hasn't changed much. I'll give the fuel pressure test a go when I have some time.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
upmaine
2nd Gen S-series (1995-2005) Tech
4
02-18-2012 09:45 AM
sailorjohn
Lighting & Electrical
3
12-22-2011 03:17 PM
PubEnemy
2nd Gen S-series (1995-2005) Tech
10
08-01-2011 08:27 AM
thisspaceforbrent
2nd Gen S-series (1995-2005) Tech
10
10-14-2009 12:57 PM
cage47
2nd Gen S-series (1995-2005) Tech
5
09-29-2009 08:43 PM


Thread Tools
Search this Thread
Quick Reply: Fuel Filter Change-MPG Drops


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.