Low fuel level = poor running?
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Joined: Dec 2005
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Low fuel level = poor running?
Hello all, I have a 99 f250 4x4 and recently noticed that when the fuel level is below 1/4 of a tank that the truck runs very rough. The only time it does that is when the tank is below 1/4 of a tank. I have replaced the CPS in the past and I am positive it is not the problem. I wanted some opinions before I pull the tank. My first thought is that the sending unit (for some reason) is sitting high in the tank and not getting good fuel flow when the tank is low. Anyone else had this problem?
Post Fiend
Joined: Oct 2003
Posts: 5,903
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From: MICHIGAN
Check this link
http://community.webshots.com/album/32303501JuYKPH
Also at the top of this forum is a link to common mods (problems)
http://community.webshots.com/album/32303501JuYKPH
Also at the top of this forum is a link to common mods (problems)
Posting Guru
Joined: Mar 2002
Posts: 1,129
Likes: 0
From: Twin Cities, MN
Here is what my little buggers looked like before cleaning them. The one is all black and the other shows some crud still. Ended up using injector cleaner to clean them. I would have done the mod that eliminates these but I didn't have the parts needed.
I also had my truck do this when I got below 1/4 tank for the first time in well over a year since I often keep it full cause it does tend to sit a lot.
Here they are cleaned up.
I also had my truck do this when I got below 1/4 tank for the first time in well over a year since I often keep it full cause it does tend to sit a lot.
Here they are cleaned up.
Post Fiend
Joined: Jul 2005
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From: 21791
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Fleet Mechanic
Joined: Jun 2004
Posts: 1,296
Likes: 1
From: Coal Valley, Illinois
Originally Posted by wolfmanagh
Here they are cleaned up.
Originally Posted by Tenn01PSD350
OKAY then, I'll be the first one to bite. WTH are those items and where are they?
edit: I would guess you have an air infiltration problem. Do the in-tank and pre-pump mods. I would get the parts for the mods if you are going to drop the tank anyway to check for crud. It's fairly easy to do. Good luck.
Last edited by hink10; Aug 15, 2006 at 10:08 PM.
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