Fuel Filter Replacement L5P 2018 - Chevy and GMC Duramax Diesel Forum
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post #1 of 5 (permalink) Old 08-13-2019, 05:34 PM Thread Starter
KVF
 
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Fuel Filter Replacement L5P 2018

I’ve seen several videos on replacing the fuel filter and it seems easy. Just one question where does the air go that is in the cartridge after replacing the filter?
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post #2 of 5 (permalink) Old 08-14-2019, 08:10 AM
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Originally Posted by KVF View Post
Iíve seen several videos on replacing the fuel filter and it seems easy. Just one question where does the air go that is in the cartridge after replacing the filter?


Through the motor and out? I just did mine at 15k (11%) and I didnít bother trying to fill the filter, I just put her in dry and the only thing was the 2nd time I started it (1st start was only 30sec running) it took 2 sec longer to fire than normal.


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post #3 of 5 (permalink) Old 08-14-2019, 09:11 PM
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If you read the manual, it says to cycle the key 2-3 times leaving it on for 30 seconds each time (IIRC). What I did was to take the filler cap off, turn the key on, and listen for air. After the 2nd or 3rd cycle (you can hear when the fuel pump cuts off), no more air. Start truck, and it runs fine.

You have to be careful of the air getting into the pump and injectors. Air is bad for these things.

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18 Denali CCSB 2500 4WD Mineral Metallic with Cocoa/Dark Sand Interior
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post #4 of 5 (permalink) Old 08-15-2019, 07:49 AM
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If the truck is running fine and no codes a showing I should be ok, right? I cycled the key once for 30sec and then started it. It took a second longer to start the second time I started it, but fired right up. Iíve been driving it for 2 days and no issues. Could I still have done damage?


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post #5 of 5 (permalink) Old 08-15-2019, 05:37 PM
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No damage. You're fine. I've had similar things occur when I changed the fuel filter once or twice. Think nothing more of it.

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