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Old 12-14-2015, 07:50 PM   #1
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"5.9" cummins hot fuel smell when running

I have a 2002 Bluebird w/ a 5.9 Cummins. After it has been running a while I smell hot fuel fumes in the drivers area. Has anyone else experienced this before?
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Old 12-14-2015, 08:29 PM   #2
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You probably got a leak somewhere. Spray the whole engine clean and drive it. Then look for leaks. There's rubber O-rings on the injector tubes that'll harden and leak. There's also rubber washers on every banjo bolt that will degrade and leak. Spray it down and start looking.
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Old 12-14-2015, 09:47 PM   #3
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I just chased and repaired leaks at all the O rings on the engine mtd fuel filter. The drain valve has 4, the water in fuel sensor was dribbling, the cover for the (optional) fuel warmer has 1also. And yes, check those sealing washers and the filter cover!
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Old 12-14-2015, 10:35 PM   #4
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Excessive piston blow-by can create a cloud of dieselly vapour smell around an engine as well. Sort of an exhaust + unburned diesel + oil smell.
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Old 12-15-2015, 07:02 PM   #5
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Thanks for the info.
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Old 12-15-2015, 07:04 PM   #6
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Thank you. I will look.
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Old 12-15-2015, 07:07 PM   #7
Mini-Skoolie
 
Join Date: Nov 2015
Location: Pittston, ME
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Year: 2002
Coachwork: Bluebird
Chassis: CSFE
Engine: 5.9 Cummins ISB
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I did some checking on the net and found that engines with high mileage have injector issues and can have low compression. I am fortunate to have a fairly low mileage engine. However it sat for probably 1 1/2 years being run very little. I will check and replace seals as this is the most likely cause. Thank you.
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