Changed fuel filter = rough idle??
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From: Durand
Changed fuel filter = rough idle??
I changed my fuel filters last night and now my truck has a rough idle/miss to it. I followed the instructions and even primed the system (3) times before starting the truck. The only thing I didn't have was a torque wrench, but I was trying to be very careful. Could this be caused by overtightening the caps? Or even under torqued?
Any ideas?
Thanks in advance,
Scott
Any ideas?
Thanks in advance,
Scott
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From: Durand
Toolman - I was checking for that as sort of gage to make sure it was seated. The truck started fine and as I crawled back under to look for leaks (none) on the lower filter, that is when the truck started to miss. When priming the fuel system, I probably only waited 5-10 seconds between cycles? could the problem just be air trapped in the system yet?
I am going to torque the caps to spec tonight.
Thanks for the reply
I am going to torque the caps to spec tonight.
Thanks for the reply
Senior User
Joined: Oct 2005
Posts: 465
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From: Nesconset NY
yes left over air could be the problem. a torque wrench is not required to chang fuel filters. you just have to make sure that the threads on the caps are clean and lube the o rings with oil or a light grease or petroleum gelly, not fuel and make sure the flanges meet. Good luck
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From: Durand
Thanks Toolman. I did use fuel to lube the o-rings though, not grease. Should I go back and do that?
Just cycling the pump and waiting between the cycles will be enough to purge air out? Or just drive it and let it work itself out?
Just cycling the pump and waiting between the cycles will be enough to purge air out? Or just drive it and let it work itself out?
Lead Driver
Joined: Jan 2005
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From: Huntington Indiana
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Fleet Mechanic
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From: West Cornwall, CT
When changing the fuel filters I look for the following:
1. Use OEM filters.
2. Change the filter o-rings and lubricate them with engine oil.
3. Snap the filter into the cap and install it into the housing.
4. Tighten the filter so that there is no gap between the filter cap and the filter housing. You will feel resistance when the o-ring begins to seat, but if the o-ring was properly lubricated it will allow you to fully tighten the cap.
If the truck runs rough after filter replacement, the filter is not properly tightened or the o-ring is likely cut.
The tech folder has excellent fuel filter replacement instructions that are far better than the above.
Lou Braun
1. Use OEM filters.
2. Change the filter o-rings and lubricate them with engine oil.
3. Snap the filter into the cap and install it into the housing.
4. Tighten the filter so that there is no gap between the filter cap and the filter housing. You will feel resistance when the o-ring begins to seat, but if the o-ring was properly lubricated it will allow you to fully tighten the cap.
If the truck runs rough after filter replacement, the filter is not properly tightened or the o-ring is likely cut.
The tech folder has excellent fuel filter replacement instructions that are far better than the above.
Lou Braun
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Cargo Master
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You're not alone with this; I had the same issue. I pulled it all apart, checked, threads, o-rings, etc, reinstalled EXACTLY as I had the first time and had no issues. I don't know the issue, but making sure the caps are seated is key. Listen to all of these guys and use the tech folder are my best recommendations for you. Good luck.
