For those running EFI - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ABLAZN · 11-01-2007, 11:18 PM

For those running EFI, how did you run your return line into your stock thank? I have heard of one that T's into the filler neck, but I don't know where to find a kit if they make one.

Andy4639 · 11-02-2007, 12:53 AM

I used the vent line and tied into it.

earl87gta · 11-02-2007, 02:43 AM

here is the kit that summit sells http://store.summitracing.com/partde...5&autoview=sku

svgould · 11-02-2007, 03:28 AM

I used a 72 style sending unit....it has two tubes coming out the top. I used the normal one for the feed, and then made the other one longer inside of the tank and used it as a return.

Slammed70 · 11-02-2007, 09:45 AM

When you get your new tank to get it out of the cab....tell them you want a bung for the return line.

ABLAZN · 11-02-2007, 09:48 PM

Quote:

Originally Posted by earl87gta

here is the kit that summit sells http://store.summitracing.com/partde...5&autoview=sku

Thanks, I found that same kit after posting. The fuel sender idea sounds cool to.

Quote:

Originally Posted by Slammed70

When you get your new tank to get it out of the cab....tell them you want a bung for the return line.

No need to move my tank, this system is going in my Blazer, but if I ever replace the tank, that is the way I will go.

herb101 · 11-02-2007, 09:51 PM

I have heard that its better to return fuel to the bottom of the tank for a few reasons. One is aireation of the fuel - returning to the bottom ensures it flows into liquid. The other, and scarier one, is static discharge in the fuel vapor layer.

Never heard of a specific case on an issue, but every factory return setup I've seen has a return tube that dumps at the bottom of the tank.

Herb

Slammed70 · 11-02-2007, 10:02 PM

Quote:

Originally Posted by herb101

and scarier one, is static discharge in the fuel vapor layer.

Yeah, dont worry about that....its too "rich" in the tank with not enough oxygen to cause any problems.

**Boog** · 11-02-2007, 10:25 PM

I think a return line too close to the bottom will keep sediments stirred up making it easier to clog up the pickup screen.

Ackattack · 11-03-2007, 06:06 PM

I hooked my return line up to the other fitting on the sending unit in my 72. Haven't had a problem with it (or the "unreliable" electric out of the tank fuel pump)

11-01-2007, 11:18 PM	#1
ABLAZN Oh..never mind.... Join Date: Aug 2006 Location: Oregon Posts: 588	For those running EFI For those running EFI, how did you run your return line into your stock thank? I have heard of one that T's into the filler neck, but I don't know where to find a kit if they make one. __________________ 1972 Blazer -6 inch lift -35 inch BFG A/T's Turbo 350 NP-205 454 BB (for now) MORE TO COME !!!!!! Now going to 2WD!!!!! Sold. I got it back after 22 years and did not even know it !!! THE STORY HERE Project Low Down Dirty Rat

11-02-2007, 12:53 AM	#2
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: For those running EFI I used the vent line and tied into it. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

11-02-2007, 02:43 AM	#3
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	Re: For those running EFI here is the kit that summit sells http://store.summitracing.com/partde...5&autoview=sku __________________ Earl 68 2500 4x4 GMC Burb

11-02-2007, 03:28 AM	#4
svgould Active Member Join Date: Jul 2003 Location: Boise Idaho Posts: 296	Re: For those running EFI I used a 72 style sending unit....it has two tubes coming out the top. I used the normal one for the feed, and then made the other one longer inside of the tank and used it as a return. __________________ 1971 SWB SOLD LT1 motor / 4l60E transmission ECE front dropped spindles with stock height springs 4" rear springs Coys Wheels 18 x 8 all the way around Hydratech hydroboost brake system

11-02-2007, 09:51 PM	#7
herb101 Used Register Join Date: May 2005 Location: Live Oak, TX Posts: 379	Re: For those running EFI I have heard that its better to return fuel to the bottom of the tank for a few reasons. One is aireation of the fuel - returning to the bottom ensures it flows into liquid. The other, and scarier one, is static discharge in the fuel vapor layer. Never heard of a specific case on an issue, but every factory return setup I've seen has a return tube that dumps at the bottom of the tank. Herb

11-02-2007, 10:25 PM	#9
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: For those running EFI I think a return line too close to the bottom will keep sediments stirred up making it easier to clog up the pickup screen. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

11-03-2007, 06:06 PM	#10
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,524	Re: For those running EFI I hooked my return line up to the other fitting on the sending unit in my 72. Haven't had a problem with it (or the "unreliable" electric out of the tank fuel pump) __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

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