gen lll swap fuel cell? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

texastrendz · 12-25-2011, 05:59 PM

I purchased an aluminum fuel cell for my 67-72 truck that I am installing an ls based motor. I want to run an external fuel pump and filter. My fuel cell does not have a return bung welded into it. Can i run the return through the roll over vent or do I need to weld a return bung into my tank. I have a truck style motor with a return line coming off of the rail. thanks daniel

**Clyde65** · 12-25-2011, 06:27 PM

Take the tank to a local shop to weld one in. Don't use the vent.
Posted via Mobile Device

BR3W CITY · 12-26-2011, 02:08 PM

The vent on my cell was a -8 AN bung, so I used the vent for the return and switched to a vented cap.

vin63 · 12-26-2011, 02:34 PM

Quote:

Originally Posted by texastrendz

I purchased an aluminum fuel cell for my 67-72 truck that I am installing an ls based motor. I want to run an external fuel pump and filter. My fuel cell does not have a return bung welded into it. Can i run the return through the roll over vent or do I need to weld a return bung into my tank. I have a truck style motor with a return line coming off of the rail. thanks daniel

When I modify cells for people who need return ports, I usually use a -8 or -10 AN bulkhead fitting, cutting a hole at the opposite end of the pick up/sump like these - http://www.summitracing.com/search/D...head-Fittings/. If you go this route and if there has been fuel in the cell, use an air drill. Obviously, clean out all of the debris. I ended up modifying the fill plate on my cell for an extra return off of the high pressue regulator at the pump (I run an external EFI pump).

texastrendz · 12-26-2011, 05:58 PM

These are two fittings on the tank I have. Top is the feed and the brass is the rollover vent. I am thinking of changing all the fittings to AN -6. I can buy all the bungs and have them tig welded on top of the NPT threads. I am thinking of turning the feed line into the return line and tig welding a -6 AN fitting to the bottom right corner for the feed line. Do yall see a problem with this?

vin63 · 12-27-2011, 02:53 PM

I would use at least a -10 AN for the supply to the pump, and -8AN for the returns (fuel volume over time consideration)...this will also help keep the fuel cooler.

texastrendz · 12-27-2011, 08:14 PM

Quote:

Originally Posted by vin63

I would use at least a -10 AN for the supply to the pump, and -8AN for the returns (fuel volume over time consideration)...this will also help keep the fuel cooler.

That seems big to me, this is my first ls motor. I was going to run 3/8 aluminum line for the feed and return and all -6 fittings since it is the same size. Is this to small for a stock ls 5.3 motor?

68GMCCustom · 12-27-2011, 08:19 PM

my fuel feed is also 1/2" aluminum hard line and -8 stainless flex hose.

BR3W CITY · 12-27-2011, 11:22 PM

I'm running 3/8 both ways without issue.

12-25-2011, 05:59 PM	#1
texastrendz Registered User Join Date: Jan 2008 Location: HOUSTON TX Posts: 1,161	gen lll swap fuel cell? I purchased an aluminum fuel cell for my 67-72 truck that I am installing an ls based motor. I want to run an external fuel pump and filter. My fuel cell does not have a return bung welded into it. Can i run the return through the roll over vent or do I need to weld a return bung into my tank. I have a truck style motor with a return line coming off of the rail. thanks daniel

12-25-2011, 06:27 PM	#2
Clyde65 1965 Chevy C10, 2005 4.8L/4l60 Join Date: Aug 2004 Location: DFW Texas Posts: 8,546	Re: gen lll swap fuel cell? Take the tank to a local shop to weld one in. Don't use the vent. Posted via Mobile Device __________________ Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 *support our troops!*

12-26-2011, 02:08 PM	#3
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: gen lll swap fuel cell? The vent on my cell was a -8 AN bung, so I used the vent for the return and switched to a vented cap. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

12-26-2011, 05:58 PM	#5
texastrendz Registered User Join Date: Jan 2008 Location: HOUSTON TX Posts: 1,161	Re: gen lll swap fuel cell? These are two fittings on the tank I have. Top is the feed and the brass is the rollover vent. I am thinking of changing all the fittings to AN -6. I can buy all the bungs and have them tig welded on top of the NPT threads. I am thinking of turning the feed line into the return line and tig welding a -6 AN fitting to the bottom right corner for the feed line. Do yall see a problem with this? Attached Images

12-27-2011, 02:53 PM	#6
vin63 It's Better With Nitro Join Date: Apr 2008 Location: Chino Hills, CA Posts: 2,262	Re: gen lll swap fuel cell? I would use at least a -10 AN for the supply to the pump, and -8AN for the returns (fuel volume over time consideration)...this will also help keep the fuel cooler. __________________ 1963 C-10: Deluxe-optioned cab, shortbed, fleetside Pontiac 462 ci, Kauffman D-Port alum. heads 4L80E, narrowed sheetmetal Ford 9-inch Tubular front and rear suspension Custom 6-piston front disc and 4-piston rear disc brakes

12-27-2011, 08:19 PM	#8
68GMCCustom Truck and auto performance nut Join Date: Feb 2007 Location: McKinney,Texas Posts: 3,848	Re: gen lll swap fuel cell? my fuel feed is also 1/2" aluminum hard line and -8 stainless flex hose. __________________ Kurt - '68 GMC short step - NIB '09 LY6 6.0L crate motor w/mods, NIB '12 crate 4L85e w/billet 3k stall Circle D, 3.73 posi 12 bolt, DynaTech f-swap headers, 3/4 drop, handling mods, etc. - my toy '72 Chevy LWB C-10 Highlander - 350/350 ps/pb/tilt/ac - not original but close '06 Chevy TrailBlazerSS - LS2/4L70e - little black hot rod SUV - my DD '18 Kia Sorento - wife's econo-driver '95 Chevy S10 - reg cab shortbed, LS, 4.3, auto... my '68's powertrain and chassis build -links broken A surprise phase - carb to efi -links broken

12-27-2011, 11:22 PM	#9
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: gen lll swap fuel cell? I'm running 3/8 both ways without issue. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

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