What are the three fuel lines for the 5.3L - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jfarns03 · 07-21-2013, 03:10 PM

For my 5.3L swap i noticed i have three fuel lines connected all around the engine and i dont know which is which. Pic are helpful!

mmiddle · 07-21-2013, 03:40 PM

The big one is the fuel supply goes to the fuel rail.
The next one is the fuel return goes to the FPR on the fuel rail.
The other is the purge vacuum line going to the purge valve on top front of the upper plenum.

Sorry, no pics from me.

Jfarns03 · 07-21-2013, 03:46 PM

where do i hook up the vacuum line too? Thanks for the response!

mmiddle · 07-21-2013, 04:20 PM

It goes to the fuel tank purge charcoal canister that is originally mounted in front of the tank. If you are not using the canister then it can be eliminated. However the purge sequence must be edited in the ECM or you will get codes

eagleuh1 · 07-21-2013, 06:42 PM

Put a vacuum plug over it and delete on your PCM when you have it tuned, as stated above.

Jfarns03 · 07-21-2013, 06:52 PM

perfect thank you guys! im inching closer to getting this thing running!

88Ironduke · 07-21-2013, 10:21 PM

I used that port on another project to provide vacume for power brakes. The motor didn't have a vacume port for the booster so it made sense to re-purpose the existing port.

88

mmiddle · 07-21-2013, 11:10 PM

Truthfully, I'm thinking about using the Evap canister. I have it from the '99 parts truck I had. I'm still unclear on what I want to do with the fuel tank/supply system.

Jfarns03 · 07-24-2013, 10:35 PM

if i cap it off will it effect the performance of the truck?

07-21-2013, 03:10 PM	#1
Jfarns03 Registered User Join Date: May 2013 Location: Manhattan Beach CA Posts: 129	What are the three fuel lines for the 5.3L For my 5.3L swap i noticed i have three fuel lines connected all around the engine and i dont know which is which. Pic are helpful! __________________ A place for everything, everything in its place. Check out my build thread! http://67-72chevytrucks.com/vboard/s...43#post6129043

07-21-2013, 03:40 PM	#2
mmiddle Registered User Join Date: Jul 2013 Location: Forestburg, Texas Posts: 659	Re: What are the three fuel lines for the 5.3L The big one is the fuel supply goes to the fuel rail. The next one is the fuel return goes to the FPR on the fuel rail. The other is the purge vacuum line going to the purge valve on top front of the upper plenum. Sorry, no pics from me. __________________ Mark Jesus is the Way! 2003 2500HD CCLB Duramax/Ali (Clifford) 2014 2SS/RS black on black Camaro (Betty) 2006 Pontiac SOLSTICE silver/black (Lula-Bell) 1970 C/10 Short Wide (Peggy) 1964 C/10 Short Step (Hambone) RIP Jimmy Hamilton Thank you for the trucks

07-21-2013, 03:46 PM	#3
Jfarns03 Registered User Join Date: May 2013 Location: Manhattan Beach CA Posts: 129	Re: What are the three fuel lines for the 5.3L where do i hook up the vacuum line too? Thanks for the response! __________________ A place for everything, everything in its place. Check out my build thread! http://67-72chevytrucks.com/vboard/s...43#post6129043

07-21-2013, 04:20 PM	#4
mmiddle Registered User Join Date: Jul 2013 Location: Forestburg, Texas Posts: 659	Re: What are the three fuel lines for the 5.3L It goes to the fuel tank purge charcoal canister that is originally mounted in front of the tank. If you are not using the canister then it can be eliminated. However the purge sequence must be edited in the ECM or you will get codes __________________ Mark Jesus is the Way! 2003 2500HD CCLB Duramax/Ali (Clifford) 2014 2SS/RS black on black Camaro (Betty) 2006 Pontiac SOLSTICE silver/black (Lula-Bell) 1970 C/10 Short Wide (Peggy) 1964 C/10 Short Step (Hambone) RIP Jimmy Hamilton Thank you for the trucks

07-21-2013, 06:42 PM	#5
eagleuh1 Registered User Join Date: Jul 2009 Location: Russellville, Arkansas Posts: 1,699	Re: What are the three fuel lines for the 5.3L Put a vacuum plug over it and delete on your PCM when you have it tuned, as stated above.

07-21-2013, 06:52 PM	#6
Jfarns03 Registered User Join Date: May 2013 Location: Manhattan Beach CA Posts: 129	Re: What are the three fuel lines for the 5.3L perfect thank you guys! im inching closer to getting this thing running! __________________ A place for everything, everything in its place. Check out my build thread! http://67-72chevytrucks.com/vboard/s...43#post6129043

07-21-2013, 10:21 PM	#7
88Ironduke Registered User Join Date: Jul 2010 Location: Willingboro, NJ Posts: 489	Re: What are the three fuel lines for the 5.3L I used that port on another project to provide vacume for power brakes. The motor didn't have a vacume port for the booster so it made sense to re-purpose the existing port. 88

07-21-2013, 11:10 PM	#8
mmiddle Registered User Join Date: Jul 2013 Location: Forestburg, Texas Posts: 659	Re: What are the three fuel lines for the 5.3L Truthfully, I'm thinking about using the Evap canister. I have it from the '99 parts truck I had. I'm still unclear on what I want to do with the fuel tank/supply system. __________________ Mark Jesus is the Way! 2003 2500HD CCLB Duramax/Ali (Clifford) 2014 2SS/RS black on black Camaro (Betty) 2006 Pontiac SOLSTICE silver/black (Lula-Bell) 1970 C/10 Short Wide (Peggy) 1964 C/10 Short Step (Hambone) RIP Jimmy Hamilton Thank you for the trucks

07-24-2013, 10:35 PM	#9
Jfarns03 Registered User Join Date: May 2013 Location: Manhattan Beach CA Posts: 129	Re: What are the three fuel lines for the 5.3L if i cap it off will it effect the performance of the truck? __________________ A place for everything, everything in its place. Check out my build thread! http://67-72chevytrucks.com/vboard/s...43#post6129043



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