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Old 09-18-2019, 05:52 PM   #1
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Join Date: Jul 2019
Location: Connecticut
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Year: 2001
Chassis: GMC B7000
Engine: 3126 cat
Rated Cap: 72 max cap
Water in fuel light issue, please help

I am having water in fuel issues with my 2001 GMC bluebird. It has a 3126 cat motor and an Allison 2000 series transmission. I can start and run the bus just fine. As soon as I pull out of my driveway and start moving down the road the water in fuel light comes in and the transmission will not shift up or down. I have looked vigorously to find a fuel bowl and a sensor to drain or replace, but I cannot find anything. I have replaced all filters with exact replacements and still no luck. I have put additive in the fuel before and after draining fuel to physically see water separating. I was told by a friend the bus fuel water separated was deleted? Where would the separated be and or the sensor on the bus to maybe jump out or replace? Spent thousands on this project and itís just sitting in the driveway. Please help.
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Old 09-18-2019, 07:33 PM   #2
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Join Date: Mar 2017
Location: Pasadena Tx
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Coachwork: 1991 bluebird
Just to give you an idea. Not sure where exactly on the cat.
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Old 09-18-2019, 08:23 PM   #3
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Location: Dawsonville, Ga.
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Year: 1999
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Chassis: International
Engine: DT466/3060
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I would never have published that video, what a butterfinger. Doesn't know righty tighty, lefty loosey. Towels and a jar to catch and ends up with fuel all over.:facepalm
I wonder how he would have done if it were underneath on a frame rail like 90% of them.
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Old 09-19-2019, 04:04 AM   #4
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Join Date: Sep 2015
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Year: 2002
Coachwork: Thomas Built Bus
Chassis: Freightliner FS65
Engine: Caterpillar 3126E Diesel
Rated Cap: 71 Passenger- 30,000 lbs.
I do not have the same machine as you, so this information may not help at all.


Our bus is a conventional front engine with a Cat 3126 and an Allison 2000. The fuel/water separator is on the firewall on the driver side, up high. There is a glass bowel on the bottom. You can see the water in the fuel, if you have water in the fuel. The diesel floats on top so you can loosen the thumb knob on the bottom of the bowel and the water, debris, and a little diesel will come out. *SOMETIMES* you have to prime the fuel after draining the water, depending on how much you had to drain.
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Old 09-20-2019, 10:08 PM   #5
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Join Date: Jul 2019
Location: Connecticut
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Year: 2001
Chassis: GMC B7000
Engine: 3126 cat
Rated Cap: 72 max cap
I appreciate the recommendation, I will take a look tomorrow. Nothing has jumped out at me yet.
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