Drained Fuel Rails - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 36 (permalink) Old 10-10-2016, 10:46 AM Thread Starter
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Drained Fuel Rails

So the other day on Saturday I was doing some back road racing and looking back at it I feel bad for doggin the ol dmax but it was a good time and still feels like new. Anyways on the 5th race my fuel rails drained I was going 80 and then lost power "change fuel filter" messaged popped up and check engine light did to I thought I limped the tranny so I threw it in neutral immediately but it was ok I got the gas station read the code and it read P0087 I cleared it and reset the fuel filter and pumped a full tank of diesel and been babying it since and they haven't came on yet feels like if nothing ever even happened feels good as new still any ideas on what cause that? I was on the street 150hp tune I also have a sump and lift pump. Truck only has 3,3xx miles.


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post #2 of 36 (permalink) Old 10-10-2016, 10:56 AM
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Is the pump running?
Hope the cp4 isn't about to take a dump on you.
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post #3 of 36 (permalink) Old 10-10-2016, 10:57 AM Thread Starter
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Quote:
Originally Posted by LML6600DMAX View Post
Get a lift pump


I do and a sump


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post #4 of 36 (permalink) Old 10-10-2016, 10:58 AM
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I corrected the first post didn't read far enough.
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post #5 of 36 (permalink) Old 10-10-2016, 11:07 AM Thread Starter
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Quote:
Originally Posted by LML6600DMAX View Post
Is the pump running?
Hope the cp4 isn't about to take a dump on you.


I assume it is it turns on and is pulling fuel from sump but I'm not sure if it's at it's full potential is there any way to check and I hope not is there any way to diagnose if it's about to go out? If so, so I can stop driving it and order a cp3 before it ruins and breaks more things.


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post #6 of 36 (permalink) Old 10-10-2016, 11:22 AM
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Kennedy makes a gauge that hooks up to the test port beside the alternator.

Turn the key and crawl under hear if it's running. Could be simple as a blown fuse or bad wire/connection.

If it's running fine I doubt it's the cp4 typically they just go with no warning.
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post #7 of 36 (permalink) Old 10-10-2016, 11:51 AM Thread Starter
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Quote:
Originally Posted by LML6600DMAX View Post
Kennedy makes a gauge that hooks up to the test port beside the alternator.

Turn the key and crawl under hear if it's running. Could be simple as a blown fuse or bad wire/connection.

If it's running fine I doubt it's the cp4 typically they just go with no warning.


Alright I look Into that Could it also be that when I raced i only had a quarter tank of diesel


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post #8 of 36 (permalink) Old 10-10-2016, 12:12 PM
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Shouldn't matter because you have a sump so it's always pulling from the bottom of the tank.
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post #9 of 36 (permalink) Old 10-10-2016, 12:14 PM
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Drained Fuel Rails

X2 on making sure the pump and sump is actually running first.
The sump is what lets you fun below a
1/4 tank without fueling problems.

Depending on what lift pump you have you should be able to adjust the pressure on it with the adjustment screw. It may not have been set right.

I'd look into doing a cp3 swap in the future as well. Cp4s suck.


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post #10 of 36 (permalink) Old 10-10-2016, 12:15 PM
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we are having a similar problem i think mine has progressed a little further than yours as of right now tho haha i just posted a new thread "help lml issue" read what my trucks doing and chime in haha
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