87' LS Swap fuel system - The 1947 - Present Chevrolet & GMC Truck Message Board Network

LSSierra · 02-13-2017, 03:23 PM

I'm sure this has been asked but because of the volume of threads on here I can't seem to find what I'm looking for with what I'm working with. Have an 87' Sierra, fuel injected 305 I'm yanking out and putting in a 5.3 LS with 4l60 tranny. I'm determined (cause it's cool and it currently works) to keep my dual fuel tanks working when the swap is complete. I've heard a myriad of things about how to do this. I have a returnless system, truck intake. Can I use the stock fuel lines and just get new fittings for the new pumps and corvette regulator or do I need to replace all fuel lines? Basically, can someone who knows this well help me out from the tank all the way forward to the intake? My buddy used this site for his build and I've learned a lot. Thanks in advance guys!!

aggie91 · 02-14-2017, 04:01 PM

Look at this thread (its long, but VERY informative). I believe he did the dual tank set up on this one.

http://67-72chevytrucks.com/vboard/s...d.php?t=350986

aggie91 · 02-14-2017, 04:02 PM

Look at POSTS #7 & 8 of this thread:

http://67-72chevytrucks.com/vboard/s...d.php?t=674371

LSSierra · 02-14-2017, 07:27 PM

Thanks Karl I'll check it out!

LSSierra · 02-14-2017, 09:56 PM

Ok let's see if I have this right:
Replace my 87 stock fuel pumps in the tank with the AC Delco pumps using same connectors and plugs for wiring, then moving out of the tank replace all lines not metal, then replace the tank selector to a higher capacity so I don't blow that, then use existing metal lines that already go into the engine bay and go into the corvette regulator (mine isnreturnless) and plug the return line and go from the regulator to my fuel rails. Sounds simple...can it be that easy since I'm already set up for FI or do I need to change all my lines and fittings since it's higher pressure?

aggie91 · 02-15-2017, 10:23 AM

You have it correct. You still need the return line as it comes out of the vette filter/regulator to go back to the tank. The steel lines in your '87 are more that capable for the 58 psi that the LS engine uses.

It really is that simple...

LSSierra · 02-15-2017, 03:31 PM

Thanks so much Karl...huge help knowing I'm not off my rocker here...and pretty excited I don't have to run all that line!!

Thanks for taking the time.

02-13-2017, 03:23 PM	#1
LSSierra Registered User Join Date: Feb 2017 Location: Jacksonville, NC Posts: 29	87' LS Swap fuel system I'm sure this has been asked but because of the volume of threads on here I can't seem to find what I'm looking for with what I'm working with. Have an 87' Sierra, fuel injected 305 I'm yanking out and putting in a 5.3 LS with 4l60 tranny. I'm determined (cause it's cool and it currently works) to keep my dual fuel tanks working when the swap is complete. I've heard a myriad of things about how to do this. I have a returnless system, truck intake. Can I use the stock fuel lines and just get new fittings for the new pumps and corvette regulator or do I need to replace all fuel lines? Basically, can someone who knows this well help me out from the tank all the way forward to the intake? My buddy used this site for his build and I've learned a lot. Thanks in advance guys!!

02-14-2017, 04:01 PM	#2
aggie91 I'm just glad to be here! Join Date: Jan 2008 Location: Longview, TX Posts: 4,788	Re: 87' LS Swap fuel system Look at this thread (its long, but VERY informative). I believe he did the dual tank set up on this one. http://67-72chevytrucks.com/vboard/s...d.php?t=350986 __________________ Karl 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square

02-14-2017, 04:02 PM	#3
aggie91 I'm just glad to be here! Join Date: Jan 2008 Location: Longview, TX Posts: 4,788	Re: 87' LS Swap fuel system Look at POSTS #7 & 8 of this thread: http://67-72chevytrucks.com/vboard/s...d.php?t=674371 __________________ Karl 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square

02-14-2017, 07:27 PM	#4
LSSierra Registered User Join Date: Feb 2017 Location: Jacksonville, NC Posts: 29	Re: 87' LS Swap fuel system Thanks Karl I'll check it out! __________________ -1987 GMC Sierra Classic 5.3 LS - -2001 Toyota Camry 175k -

02-14-2017, 09:56 PM	#5
LSSierra Registered User Join Date: Feb 2017 Location: Jacksonville, NC Posts: 29	Re: 87' LS Swap fuel system Ok let's see if I have this right: Replace my 87 stock fuel pumps in the tank with the AC Delco pumps using same connectors and plugs for wiring, then moving out of the tank replace all lines not metal, then replace the tank selector to a higher capacity so I don't blow that, then use existing metal lines that already go into the engine bay and go into the corvette regulator (mine isnreturnless) and plug the return line and go from the regulator to my fuel rails. Sounds simple...can it be that easy since I'm already set up for FI or do I need to change all my lines and fittings since it's higher pressure? __________________ -1987 GMC Sierra Classic 5.3 LS - -2001 Toyota Camry 175k -

02-15-2017, 10:23 AM	#6
aggie91 I'm just glad to be here! Join Date: Jan 2008 Location: Longview, TX Posts: 4,788	Re: 87' LS Swap fuel system You have it correct. You still need the return line as it comes out of the vette filter/regulator to go back to the tank. The steel lines in your '87 are more that capable for the 58 psi that the LS engine uses. It really is that simple... __________________ Karl 1965 Chevy Stepside(Grandpa's Old Blue) and (July 2015 Shop Build!)(2020, the Saga Continues) http://67-72chevytrucks.com/vboard/s...d.php?t=372424 The LST Challenge: http://67-72chevytrucks.com/vboard/s...=1#post7812257 Korbin's 1st Square: "Sunburn" http://67-72chevytrucks.com/vboard/s...d.php?t=418618 1985 GMC Sierra: "White Trash", Korbin's 2nd now... http://67-72chevytrucks.com/vboard/s...d.php?t=632305 Henry - 1984 Chevrolet, Owen's 1st Square

02-15-2017, 03:31 PM	#7
LSSierra Registered User Join Date: Feb 2017 Location: Jacksonville, NC Posts: 29	Re: 87' LS Swap fuel system Thanks so much Karl...huge help knowing I'm not off my rocker here...and pretty excited I don't have to run all that line!! Thanks for taking the time. __________________ -1987 GMC Sierra Classic 5.3 LS - -2001 Toyota Camry 175k -



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