Quick question: Return line-TBI to Carb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cfan10 · 01-31-2020, 08:43 PM

OK, I can't go out to find what size to order rubber hose, because it's muddy and sloppy from raining...what size fuel line is the return line on each side where the fuel filter connect and mounts to the frame.
I'm running a electric fuel pump in place of the fuel filter. I've already swapped to the hei have it wired up and carb not to get the fuel system buttoned up. Resistor for the alternator.
As always thanks in advance for your help! It is greatly appreciated!

1990 suburban 5.7 tbi 700r4

**TKCR** · 01-31-2020, 08:48 PM

When I did all my hoses, I just cut a small piece off each hose. Took it to Advanced Auto and they had all the hose I needed. I just got more than enough length of all of it.

sweetk30 · 01-31-2020, 09:38 PM

3/8" feed and 5/16 return is the std for these rigs over the years .

did you bypass or swap the intank pump ? you can NOT suck threw a intank pump and feed the engine . also the pump pushes fuel better than sucking fuel .

if you still have the intank pump get a return style regulator and plumb it in and there you go problem solved .

01-31-2020, 08:43 PM	#1
cfan10 Registered User Join Date: May 2011 Location: Texas Posts: 968	Quick question: Return line-TBI to Carb OK, I can't go out to find what size to order rubber hose, because it's muddy and sloppy from raining...what size fuel line is the return line on each side where the fuel filter connect and mounts to the frame. I'm running a electric fuel pump in place of the fuel filter. I've already swapped to the hei have it wired up and carb not to get the fuel system buttoned up. Resistor for the alternator. As always thanks in advance for your help! It is greatly appreciated! 1990 suburban 5.7 tbi 700r4 __________________ Rest In Peace:Mikhail {Mickey Rooney} Alpha 2/5/13 Omega 7/22/14 10:28AM I love you tremendously and outragiously Superpuppi Thai Ridgeback...The most intelligent dog known to me. Don't mess with my truck, my momma or my money...not necessarily in that order. © Stand for something or fall for anything. [LIST][*]'98 Bourbon St. Brawl ©2010

01-31-2020, 08:48 PM	#2
TKCR Senior Member Join Date: Oct 2014 Location: Ohio Posts: 6,857	Re: Quick question: Return line-TBI to Carb When I did all my hoses, I just cut a small piece off each hose. Took it to Advanced Auto and they had all the hose I needed. I just got more than enough length of all of it. __________________ FB Page for my Seats Belts https://www.facebook.com/73-87-Chevy...9439407476735/ Restoring Seatbelts: http://67-72chevytrucks.com/vboard/s...d.php?t=809750 SOLD My 86 Build:http://67-72chevytrucks.com/vboard/s...d.php?t=654972 Past Restored Bench Seats:http://67-72chevytrucks.com/vboard/s...d.php?t=715398 PayPal link to pay for your items: https://www.paypal.me/TKCR

01-31-2020, 09:38 PM	#3
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: Quick question: Return line-TBI to Carb 3/8" feed and 5/16 return is the std for these rigs over the years . did you bypass or swap the intank pump ? you can NOT suck threw a intank pump and feed the engine . also the pump pushes fuel better than sucking fuel . if you still have the intank pump get a return style regulator and plumb it in and there you go problem solved . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.



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