Fuel line question (pictures)

[YYC-SIERRA]

I have some questions about fuel lines on a 2018 5.3L gas truck:

 

- Under my truck I see 2 main fuel lines, which one would be the main fuel sending line?

 

- These black nylon hoses, do they have a specific name? Can the metal ends be removed with a GM fuel line tool?

 

- Could these black hoses connectors be replaced with a quick (push) connect fuel fitting?

 

I'm looking for a place to tie in a remote fuel filter, so I'm thinking I might be able to remove one of these black hoses, replace it with another suitable fuel line/hose with a proper fitting.

 

Thoughts?

 

1st picture is further back towards fuel tank, then the two lines go past a pump (what pump is this?) then the black hoses appear, before the lines turn upwards into the engine bay.

 

 

 

 

Edited October 6, 2020 by YYC-SIERRA

[papageoff]

The fittings in the last picture look like they're crimped and not removable/disconnectable.  It was probably done to splice in that braided line allowing for a little fudge factor in the installation process.

 

You could probably cut the feed and splice in some fittings, but you're beyond my experience there.

Edited October 6, 2020 by papageoff
additional details

[YYC-SIERRA]

Thanks papageoff

 

Anyone know if the bottom line, or top line, would be the one sending fuel to the engine?

[CamGTP]

Go back to the tank and there is one feed line coming off the tank into a hard line which should be the top line.

 

This is a picture of a flex fuel sensor install on these trucks. They run returnless fuel systems and the other line is a evap line I believe.

 

http://www.cjtunes.com/media/1016/20151130_152200.jpg?anchor=center&mode=crop&width=1100&height=650&rnd=130938101050000000

[YYC-SIERRA]

Awesome, thanks a lot CamGTP.

 

I also found this schematic which confirms the #3 line is the feed line and it is indeed the top line.

 

 

Next question......why does it seem there are NO aftermarket fuel filter setups on these gas engines?

 

I see Duramax's, Cummins, Powerstrokes, etc all have various dual water seperation / filtration remote filters that tie into the fuel lines along the frame, but I've never seen it for a gas version of the same truck. Is it incompatible with the gas fuel pump or pressure?

 

Here's some examples:

 

 

 

what would prevent someone from installing 1 or 2 fuel filters on a gas truck?

[davester]

You can, but those setups are fairly expensive, and of relatively limited benefit for a gas engine.

 

For my '04, I installed the fuel filter used for earlier GMT800's by cutting out a section of the fuel line and splicing it in.

[newdude]

5 hours ago, YYC-SIERRA said:

Awesome, thanks a lot CamGTP.

 

I also found this schematic which confirms the #3 line is the feed line and it is indeed the top line.

 

Next question......why does it seem there are NO aftermarket fuel filter setups on these gas engines?

 

I see Duramax's, Cummins, Powerstrokes, etc all have various dual water seperation / filtration remote filters that tie into the fuel lines along the frame, but I've never seen it for a gas version of the same truck. Is it incompatible with the gas fuel pump or pressure?

 

Here's some examples:

 

what would prevent someone from installing 1 or 2 fuel filters on a gas truck?

 

 

Un-necessary in a gas application, that's why.  Same with the remote filters.  Not needed for gas.  Diesel engines, its a BIG deal to have no water and clean/filtered fuel.  Diesel fuel is susceptible to have water in it, as well as fungi/bacteria and sometimes algae.     

 

Gas engines, a good quality top tier fuel is all that is needed really.  Maybe the occasional Techron treatment.      

Edited October 8, 2020 by newdude

[YYC-SIERRA]

OK gotcha, thanks.

 

But let's say, for the sake of total overkill, i still wanted to do this......would there be any issues with the 5.3 gas engine to put in a setup similar to the diesel versions? Anything to be aware of?