Fuel filter change.

calgator73 · April 9, 2017

Only took an hour and a half :/

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O_J_Simpson · April 9, 2017

It will get better with practice.

calgator73 · April 10, 2017

Forgot to lube the rubber seal middle of filter. Also cleaned inside the wheel well and repaired the fender trim. Didn't notice increased power.

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redwngr · April 10, 2017

Were you changing because of filter monitor or mileage or age?

gmacecsko · April 13, 2017

What is your change interval ? I see a lot of guys saying they change every 10,000 mile. I currently have 11,500 but the DIC say 80% filter life is left. Anyone know what info GM uses for that gauge is it gallons of fuel, vacuum, miles driven ? Just wondering if 10,000 miles is a little aggressive .

calgator73 · April 13, 2017

Were you changing because of filter monitor or mileage or age?

Kind of monitor/mileage. Monitor was down to 10% and mileage was ~52K. Based on a lot of the commentary it seems that the monitor uses some kind of vacuum to gauge life but the vacuum sensor that triggers limp mode seems like an on/off switch instead of a proportional sensor. Can't find any good info on theory of operation for the LML filter-life system.

calgator73 · April 13, 2017

What is your change interval ? I see a lot of guys saying they change every 10,000 mile. I currently have 11,500 but the DIC say 80% filter life is left. Anyone know what info GM uses for that gauge is it gallons of fuel, vacuum, miles driven ? Just wondering if 10,000 miles is a little aggressive .

I'm a bit of a nube....I tend to trust the monitors but I'm cognizant of the issues people have had in the past. Always good practice to carry a small bag with a filter, wrench, tools (for the wheel well), rags and gloves for long trips....truck will trigger limp mode if it gets to zero.

calgator73 · April 13, 2017

Over on a diesel forum awhile back someone made the claim that the LML takes into consideration rail pressure. I wonder if those that are pulling full-time with heavy loads are seeing a shorter filter life...that might indicate a fuel quantity through the filter as a factor. I drive mostly unloaded about 130-150 miles per day and usually (at least before the Michelins) 22 mpg over the course of a work week. My lifetime average is 18.5.

Just saw this:

"The fuel filter pressure switch is a normally closed switch located next to the fuel conditioning module. If fuel supply line vacuum reaches greater than 14 in Hg the switch will open. The engine control module (ECM) monitors the voltage on the fuel filter pressure switch signal circuit and will send a serial data message to the instrument panel cluster to display the FUEL FILTER RESTRICTED message."

Dnt · April 13, 2017

I thought the hood scoop was cool on the 2017 and seriously thinking about getting a new 6.6 Duramax but after reading up on the extra maintenance requirements I decided not to. Just seems to be a lot of quirky stuff to fool with. Maybe in a few years when I get real old and have more patience i might get one LOL

calgator73 · April 13, 2017

I thought the hood scoop was cool on the 2017 and seriously thinking about getting a new 6.6 Duramax but after reading up on the extra maintenance requirements I decided not to. Just seems to be a lot of quirky stuff to fool with. Maybe in a few years when I get real old and have more patience i might get one LOL

With great power comes great responsibility lol

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redwngr · April 22, 2017

I'm a bit of a nube....I tend to trust the monitors but I'm cognizant of the issues people have had in the past. Always good practice to carry a small bag with a filter, wrench, tools (for the wheel well), rags and gloves for long trips....truck will trigger limp mode if it gets to zero.

No limp mode.

It will run at whatever capability it can with the fuel available.

Prior to the new filter being released in about 2009, it was common for the filter to reach capacity and the first warning to be falling on it's face part way thru a high throttle position manouever (like passing on a 2 lane). Recommendation to new owners was always carry a filter and know how to change it. (In those days it was easy to change from above).

The new filter came at the same time as the need to change through the wheel well - miserable at best on the side of the road. Maybe the access issue was one of the reasons for the new filter?

In any case, the 'carry and know how to change' recommendation is no longer common on the dmax forums.

We've yet to learn how the new style filter on the L5P is going perform. It is cartridge rather than spin-on and it is located under the truck by the fuel tank. The L5P also has a lift pump in the fuel tank, so hand priming is no longer required.

calgator73 · April 22, 2017

Thanks! Maybe I can put my paranoia to bed.

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Peterd · July 6, 2017

Just changed fuel filter on the l5p. Worked as advertised. Quick and clean, took about 10 minutes.

A bit longer finding the right tool to loosen the canister

Waaazooo · September 19, 2017

is it under the bed or in the engine bay? I haven't gotten to point of exchange. Moreso, did you get the part from the dealer or from amazon/parts store?

jhplak325 · September 19, 2017

is it under the bed or in the engine bay? I haven't gotten to point of exchange. Moreso, did you get the part from the dealer or from amazon/parts store?

LP5’s is on the driverside under the cab.