fuel line routing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bb400ho** · 09-27-2018, 10:53 AM

hello, i need a little help here. im trying to decide how to route the fuel lines from the intake to the tank. i have a 68 gmc 2wd shortbed. the motor is a 5.3 from an 02 truck. the tank has been moved tto the rear under the bed. i have the truck manifold with the return. if i go along the firewall to the frame they seem pretty close to the header. i was looking at some of the braided line kits and saw they included 180 degree fittings. did anyone run those and have the fuel line go toward the front and then into the frame to avoid the exhaust?
thanks Bryan

**mongocanfly** · 09-27-2018, 12:51 PM

It's up to you as to how you run it...shortest distance is always best....but do stay away from the headers...use whatever it's takes and you should be good...

Macdaddy1 · 09-27-2018, 01:18 PM

In my 65 I ran them along the frame rail and then under the front part of the cab to the center of the firewall to keep them away from exhaust.

Jstock85 · 09-27-2018, 01:45 PM

definitely frame rail. I used black braided hose and Russel fittings. No issue. don't forget to Put your filter somewhere with easy access to change when the time comes

BR3W CITY · 09-27-2018, 03:44 PM

braided line from rails to firewall, then hard lined down firewall under truck near first cab mount, then over to rail and runs along passenger rail back to tank. Fuel stuff will have to cross over the exhaust path at some point, so I chose that spot since it gave ~5" air gap and let me fit a nomex sheath over the fuel line in that spot.

Tork? · 09-29-2018, 12:37 AM

Could use some adel clamps to fix it against the firewall and get passed the headers

davepl · 10-02-2018, 09:31 AM

Last one I did I just ordered a second factory fuel supply line, twinned it and used it as the return with a little modification!

**bb400ho** · 10-05-2018, 10:34 AM

ok thanks for all your ideas. after trying several ways i ended up with 120 degree fittings on 6an PTFE hose at the fuel rail. I ran the lines under the engine cover. they route around the motor mount perches and down the drivers side frame rail to the tank. it has good clearance from the headers /Exhaust
thanks Bryan

**bigmoe** · 02-06-2019, 06:53 PM

Quote:

Originally Posted by bb400ho

ok thanks for all your ideas. after trying several ways i ended up with 120 degree fittings on 6an PTFE hose at the fuel rail. I ran the lines under the engine cover. they route around the motor mount perches and down the drivers side frame rail to the tank. it has good clearance from the headers /Exhaust
thanks Bryan

So you ran the line to the front of the engine and down?

09-27-2018, 10:53 AM	#1
bb400ho Active Member Join Date: Jun 2017 Location: erie pa Posts: 150	fuel line routing hello, i need a little help here. im trying to decide how to route the fuel lines from the intake to the tank. i have a 68 gmc 2wd shortbed. the motor is a 5.3 from an 02 truck. the tank has been moved tto the rear under the bed. i have the truck manifold with the return. if i go along the firewall to the frame they seem pretty close to the header. i was looking at some of the braided line kits and saw they included 180 degree fittings. did anyone run those and have the fuel line go toward the front and then into the frame to avoid the exhaust? thanks Bryan

09-27-2018, 12:51 PM	#2
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,585	Re: fuel line routing It's up to you as to how you run it...shortest distance is always best....but do stay away from the headers...use whatever it's takes and you should be good... __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

09-27-2018, 01:18 PM	#3
Macdaddy1 Registered User Join Date: Dec 2017 Location: Niceville Florida Posts: 347	Re: fuel line routing In my 65 I ran them along the frame rail and then under the front part of the cab to the center of the firewall to keep them away from exhaust.

09-27-2018, 01:45 PM	#4
Jstock85 Registered User Join Date: Jul 2016 Location: Brandon,MS Posts: 489	Re: fuel line routing definitely frame rail. I used black braided hose and Russel fittings. No issue. don't forget to Put your filter somewhere with easy access to change when the time comes

09-27-2018, 03:44 PM	#5
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: fuel line routing braided line from rails to firewall, then hard lined down firewall under truck near first cab mount, then over to rail and runs along passenger rail back to tank. Fuel stuff will have to cross over the exhaust path at some point, so I chose that spot since it gave ~5" air gap and let me fit a nomex sheath over the fuel line in that spot. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

09-29-2018, 12:37 AM	#6
Tork? Registered User Join Date: May 2013 Location: Chicago, IL Posts: 217	Re: fuel line routing Could use some adel clamps to fix it against the firewall and get passed the headers

10-02-2018, 09:31 AM	#7
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: fuel line routing Last one I did I just ordered a second factory fuel supply line, twinned it and used it as the return with a little modification! __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

10-05-2018, 10:34 AM	#8
bb400ho Active Member Join Date: Jun 2017 Location: erie pa Posts: 150	Re: fuel line routing ok thanks for all your ideas. after trying several ways i ended up with 120 degree fittings on 6an PTFE hose at the fuel rail. I ran the lines under the engine cover. they route around the motor mount perches and down the drivers side frame rail to the tank. it has good clearance from the headers /Exhaust thanks Bryan



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