6.9 idi dying after warmup
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7th Gear
Joined: Dec 2025
Posts: 7
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6.9 idi dying after warmup
Alright so my 6.9 was running great until last Saturday, left home took it to a fuel station got some diesel then about 5 minutes after I left I felt it shake and stutter, then i pushed clutch in and it died, I stopped and it started right back up, drove another mile and it did it again, but after that it drove 20 miles no issue. On the way home it got so bad where I didn’t wanna kill my started by keeping starting it ever my so I parked it. Came back and replaced the fuel line from the tank to the fuel pump with a 3/8 hose, started and ran like a top….. until I got about 10 minutes down the road and i had it to the floor and it would not go over 40mph and kept trying to shutoff. Although not as bad. I feel like it’s sucking air cause when I press the Schaeder valve on the fuel filter housing there’s a bit of air that comes out, any one have any ideas what could cause this? Fuel pump I replaced about 3000 miles ago, return lines seem fine? I wouldn’t think they would effect high rpm’s tho. Any help is greatly appreciated
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7th Gear
Joined: Dec 2025
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they are pretty big, watch two dump trucks fill up and leave before I did
Fleet Owner
Joined: Jul 2006
Posts: 20,408
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From: Mi'kma'ki
I've got bad fuel that acted the same way before. Really, really, low on power and missing. It points to bad fuel because it happened right after leaving the fuel station, so. You might want to just start there; draining the tank or adding a lot of diesel 911, ATF, Oil etc. to help boost the btu's in the fuel enough to run and burn it up.
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7th Gear
Joined: Dec 2025
Posts: 7
Likes: 0
I've got bad fuel that acted the same way before. Really, really, low on power and missing. It points to bad fuel because it happened right after leaving the fuel station, so. You might want to just start there; draining the tank or adding a lot of diesel 911, ATF, Oil etc. to help boost the btu's in the fuel enough to run and burn it up.
Lead Driver
Joined: Apr 2002
Posts: 5,391
Likes: 1,266
Do you still have the stock fuel water separator? If so you can pull up the ring and dump any water trapped in it. It's located on the driver's side near the hood hinge. Famous for air intrusion and many have been bypassed. The screw on fuel filter will hold quite a bit of water too. Replace if you find water in your fuel. You can snake a small diameter hose straight down the filler hose into the tank sump and sample your fuel. Water is heavier than diesel. Use a cheap hand pump to extract some fuel for a look see.
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7th Gear
Joined: Dec 2025
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Do you still have the stock fuel water separator? If so you can pull up the ring and dump any water trapped in it. It's located on the driver's side near the hood hinge. Famous for air intrusion and many have been bypassed. The screw on fuel filter will hold quite a bit of water too. Replace if you find water in your fuel. You can snake a small diameter hose straight down the filler hose into the tank sump and sample your fuel. Water is heavier than diesel. Use a cheap hand pump to extract some fuel for a look see.
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Thread Starter
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7th Gear
Joined: Dec 2025
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okay, I was getting like a weak stream of fuel, much stronger now
Lead Driver
Joined: Apr 2002
Posts: 5,391
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I have two tanks. I have run a tank dry on a couple occasions. Both times I was by myself away from home. I managed to get to the shoulder ok. But you can't crank and bleed at the same time. I switched tanks and with a few cranks and some wait time between tries to rest the battery I was able to run fuel through the filter, IP and injectors and start the engine. The IDI will self bleed as long as there's no air intrusion anywhere.
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