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Old 05-31-2018, 03:16 PM   #1
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2016 Dynamax DX3 - Cracked fuel line on #1 Injector

Hey all... Just left Cotopaxi, Co in our 2016 Dynamax Dx3 headed to the Dynamax Rally in Tennessee. Outside of Dalhart, Tx Hwy 87, 100 mile north of Amarillo started smelling strong diesel odor in the coach. Pulled off the road, opened the hood and found fuel spraying out of the #1 injector located at the very front of the engine.

Called a truck shop in Dalhart and talked to a knowledgeable mechanic. Described the issue to him, he indicated that with 29k miles on' the coach it was highly unlikely that the line connection to the injector was loose, more likely the flange was cracked on the line supplying fuel to the #1 injector. He said this was actually a really common problem with this particular freightliner/cummins combination. Caused by vibration.

Had to send the wife in our Jeep toad to Amarillo 100 miles away to Freightliner to pick up the #1 injector line. Spent a wonderful night in north texas with a smelly cow pasture and highway on one side and very active railroad tracks hauling miles of coal cars on the other. The mechanic came out this morning and replaced the fuel line in 15 minutes. Had to go back to his shop once we got going to have the engine compartment steam clean from the diesel fuel that sprayed all over the place.

With some research, I actually found a Cummins recall C1701 on this very issue which calls for the replacement of injector #1 and #6 fuel lines with rubber isolator brackets. Visually very easy to spot this issue on your engine. Just look at the supply line for injector #1 which is at the very front of the engine. There will be no bracket whatsoever on this supply line. Have attach a picture of the new line to injector #1 which includes the rubber isolation bracket.

Looking forward to meeting everyone at the rally next week.
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Old 05-31-2018, 07:23 PM   #2
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Glad you were able to get it fixed so quickly. Drive safely, see you next week
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Old 05-31-2018, 09:56 PM   #3
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Frank, That is great information. Will have to get this done the next time we are at Freightliner.
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Old 06-01-2018, 07:12 AM   #4
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Thanks for sharing, happy you got it fixed and are back on the road. Have a safe & fun trip, see you at the Rally
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Old 06-01-2018, 07:16 AM   #5
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Thanks for the heads up. Checked mine and I have isolator clamps on both
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Old 06-01-2018, 07:58 AM   #6
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Thanks for that information. I went out and checked mine.

This is why this forum is so beneficial!
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Old 06-01-2018, 07:08 PM   #7
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Thanks for the heads up! My 2016 DX3 is reaching 12K mile. Drive safe and see you at the rally.
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Old 06-03-2018, 06:46 PM   #8
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What Cummins engine do you have in your 2016 DX3? I have the ISB 6.7 in my 2016 Force and just wondering if that recall referenced my engine as well. Thanks
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Old 06-04-2018, 03:04 PM   #9
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Cummins ISL9 CM2350 L101 8.9L 350HP
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Old 06-04-2018, 03:17 PM   #10
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Thanks for the reply. I appreciate it.
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