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Old 10-07-2012, 09:48 AM   #1 (permalink)
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chugging at low rpm fixed

So ever since I got my truck, I've been chasing this problem that when I start off or up shift and the engine is still in low rpms, up to like 1800, it would chug. Almost like timing but I timed it so I knew that was good. Changed the fuel filter a few times, ran amsoilo clean injectors, and played with pump settings, all to no avail. Then I found Larry B's after market over flow valve, OFV. I believe its made by tork-tech. Super easy to install, took like 20 minutes, I can take some pics. I bought the adjustable one so I can adjust the fuel pressure in my pump. I was pleasently surprised when I test drove my truck to find it no longer chugs!!! I also bought a fuel gage and snubber, right now it idles at 10 psi and revs up to around 20 psi, there is a lot of differing in what people say it should be, so when I find what I think it should be I'll put it in here. So if your truck is chugging, this is definitely worth the money
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Old 10-07-2012, 11:59 AM   #2 (permalink)
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Still pretty low, look up Joe g fuel write up and test your lift pump if you haven't already. Mine idle around 23 range, and around 2k rpm about 30 psi. But will agree the ofv is worth the coins
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Old 10-08-2012, 12:03 PM   #3 (permalink)
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Your FP is way too low.
Cummins' pressure specs are 17-22 psi at idle, 25-35 at 2500 rpm no load.
You will notice a big difference once it's correct.
Doubt if turning up the OFV will change the pressure, they come set at 32 psi.
You either have a bad lift pump, plugged filters or a kinked hose.
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Old 10-08-2012, 12:45 PM   #4 (permalink)
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is that so? and yeah i wasnt going to touch the ofv. i would rather fix the problem that put a bandaid on it. ill look for kinked hoses and get a new lift pump. ive changed/cleaned both filters recently, so i dont think they are the problem
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Old 10-08-2012, 12:54 PM   #5 (permalink)
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How was the prefilter when you cleaned it?
I've found when they are really dirty that the tank filter is usually plugged up too.
You can test the lift pump before replacing with instructions here> Low Pressure Fuel System Diagnostic Procedures
Hose kinks are common between the lift pump and prefilter/heater.
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Old 10-08-2012, 12:58 PM   #6 (permalink)
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ive actually cleaned both since i got the truck last year, they were really dirty, i pulled chunks of stuff out. and when i first changed the fuel filter after i got that was crazy dirty and algee and stuff. maybe i should pull everything apart and clean it good
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Old 10-08-2012, 01:02 PM   #7 (permalink)
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It's probably easier and definitely cheaper to drop your tank, clean the filter and flush the tank out than it is to replace the lift pump.
If you had algae it for sure needs to happen
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Old 10-08-2012, 01:12 PM   #8 (permalink)
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i have dropped the tank and cleaned the filter in there, but i didnt flush it, it probably could be gunked up again. and yeah it was some kind of gooy junk in the filter.
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Old 04-02-2013, 06:43 PM   #9 (permalink)
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so it got even better, changed the fuel filter again and the trans mount which was shot, and it takes off soo smooth now
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