![]() |
![]() |
#1 |
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 |
![]() |
![]() |
![]() |
#2 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
|
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. |
![]() |
![]() |
![]() |
#3 |
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 |
![]() |
![]() |
![]() |
#4 |
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
|
![]() |
![]() |
![]() |
#5 | |
Registered User
Join Date: Oct 2006
Location: Cheney, KS
Posts: 669
|
Re: For those running EFI
When you get your new tank to get it out of the cab....tell them you want a bung for the return line.
__________________
Quote:
|
|
![]() |
![]() |
![]() |
#6 | |
Oh..never mind....
Join Date: Aug 2006
Location: Oregon
Posts: 588
|
Re: For those running EFI
Quote:
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.
__________________
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 |
|
![]() |
![]() |
![]() |
#7 |
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 |
![]() |
![]() |
![]() |
#8 | |
Registered User
Join Date: Oct 2006
Location: Cheney, KS
Posts: 669
|
Re: For those running EFI
Yeah, dont worry about that....its too "rich" in the tank with not enough oxygen to cause any problems.
__________________
Quote:
|
|
![]() |
![]() |
![]() |
#9 |
laying low
![]() Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,284
|
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 |
![]() |
![]() |
![]() |
#10 |
Windy Corner of a Dirty Street
Join Date: Jun 2003
Location: Pueblo West, Colorado
Posts: 2,926
|
Re: For those running EFI
Now for something completely different..... For my EFI project I will be running a mechanical fuel pump. Sounds weird to use a mechanical fuel pump for EFI but it is possible. If you use one of the new EFI mechanical fuel pumps you do not need to plumb a return line, which is a nice bonus plus you do not need to mess with wiring up one of those unreliable aftermarket electric fuel pumps. Check it out. http://www.racepumps.com/
Here is my project thread… http://67-72chevytrucks.com/vboard/s...d.php?t=263323
__________________
Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles
|
![]() |
![]() |
![]() |
#11 |
Registered User
Join Date: Aug 2006
Location: Reno, NV
Posts: 346
|
Re: For those running EFI
I bought a complete sending unit/pump setup for a 4th gen F-Body and put it in the stock tank. Gives you a feed and return port, and pressure regulator all in one. Plus it was only about 50 bucks.
__________________
1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc. |
![]() |
![]() |
![]() |
#12 | |
Registered User
Join Date: May 2004
Location: Chandler, AZ
Posts: 519
|
Re: For those running EFI
Quote:
Thanks.
__________________
![]() ![]() |
|
![]() |
![]() |
![]() |
#13 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
|
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)
|
![]() |
![]() |
![]() |
#14 |
Windy Corner of a Dirty Street
Join Date: Jun 2003
Location: Pueblo West, Colorado
Posts: 2,926
|
Re: For those running EFI
Yeah, something about the design of their variable displacement mechanical pump and regulator does not require a return line. Call’em up. They seem like real nice and informative people at racepump.com. I won’t have mine ready to fire up for a while yet.
__________________
Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles
|
![]() |
![]() |
![]() |
#15 |
Oh..never mind....
Join Date: Aug 2006
Location: Oregon
Posts: 588
|
Re: For those running EFI
I assume that was a used unit for that price. I looked at a couple on eBay, and there were a few in that price range for the LT1 engines. I might look into seeing if the in tank pump from my donor rig (1999 Tahoe) will fit, since it is all ready paid for and it can't hurt to try.
__________________
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 |
![]() |
![]() |
![]() |
#16 |
Registered User
Join Date: Aug 2006
Location: Reno, NV
Posts: 346
|
Re: For those running EFI
Yes, it was used. I have replaced the pump since then with a bigger unit but still a great deal to get started. The unit from the Tahoe should work, just have to cut the appropriate sized hole in the tank. No big deal.
__________________
1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc. |
![]() |
![]() |
![]() |
Bookmarks |
|
|