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03-09-2015, 08:07 PM
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#1 |
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Registered User
Join Date: Jan 2015
Location: Dell Ar.
Posts: 27
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LS swap fuel system
I have a 1983 c10 that I'm putting a 99 LQ4 6.0 in. I've got a tank and sending unit from a 87, and a fuel pump for a 98. The fuel pump has two hoses with it. I know the the 3/8 line is the supply but what is the small one it's maybe 1/8? Do I leave the line off or put it on somewhere?
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03-10-2015, 10:17 AM
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#2 |
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Registered User
Join Date: May 2010
Location: Mountain House, CA
Posts: 555
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Re: LS swap fuel system
It sound like that 1/4 is the vapor line. I used the 87 sender and I had pressure and return as well as the vapor line. Look in my ls swap link I have the pic of my 87 tank set up going into my 76 that may help.
__________________
My Chevy habit is paid for by Ford diesels... Here is my SLOW LS install: http://67-72chevytrucks.com/vboard/s...55#post6456355 Caliper Rebuild: http://67-72chevytrucks.com/vboard/s...d.php?t=613748 Upper Control Arm Bushings: http://67-72chevytrucks.com/vboard/s...d.php?t=616974 IG mattcrp1 |
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03-11-2015, 07:15 AM
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#3 |
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Registered User
Join Date: Jan 2015
Location: Dell Ar.
Posts: 27
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Re: LS swap fuel system
I was thinking it was the vent line but the sending unit I've got doesn't have a spot for it. The sending units vent line is made different.
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03-11-2015, 08:11 AM
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#4 |
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Gentleman Jim Driver
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,553
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Re: LS swap fuel system
How about a picture? If its an 87 TBI sending unit, it will have 3 pipes. Supply, return and vapor vent.
FG05M (driver) and FG05N (passenger) for spectra premium brand parts.
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Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed |
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03-11-2015, 10:12 AM
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#5 |
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Registered User
Join Date: Jan 2015
Location: Dell Ar.
Posts: 27
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Re: LS swap fuel system
yeah that's how the top of mine looks also, the issue is the underside. The in tank pump has two lines I know the one is supply but there is also a small line about 1/8". that's the one that I don't have a connection point for on the sending unit. can't get pictures to load, will try again later
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03-11-2015, 01:41 PM
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#6 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: LS swap fuel system
You will most likely need to run a new return line. The feed is 3/8, return is 5/16, and vapor is 1/4. You could hook the vent to the smaller line, or run a vapor vent at the top also. The run is relatively small and straight; running new hard lines is pretty easy.
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1974 Jimmy- 5.3/4L80e/NP241 |
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03-11-2015, 02:03 PM
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#7 |
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Registered User
Join Date: May 2010
Location: Mountain House, CA
Posts: 555
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Re: LS swap fuel system
is this what yours looks like? Its an '87 sender with a fuel pump, only one line out of pump.
__________________
My Chevy habit is paid for by Ford diesels... Here is my SLOW LS install: http://67-72chevytrucks.com/vboard/s...55#post6456355 Caliper Rebuild: http://67-72chevytrucks.com/vboard/s...d.php?t=613748 Upper Control Arm Bushings: http://67-72chevytrucks.com/vboard/s...d.php?t=616974 IG mattcrp1 |
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03-11-2015, 02:04 PM
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#8 |
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Registered User
Join Date: May 2010
Location: Mountain House, CA
Posts: 555
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Re: LS swap fuel system
Look on the first page of my LS swap link I have a few more pics of my fuel system.
__________________
My Chevy habit is paid for by Ford diesels... Here is my SLOW LS install: http://67-72chevytrucks.com/vboard/s...55#post6456355 Caliper Rebuild: http://67-72chevytrucks.com/vboard/s...d.php?t=613748 Upper Control Arm Bushings: http://67-72chevytrucks.com/vboard/s...d.php?t=616974 IG mattcrp1 |
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03-11-2015, 09:30 PM
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#9 |
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Registered User
Join Date: Jan 2015
Location: Dell Ar.
Posts: 27
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Re: LS swap fuel system
Not sure if these will help but this is what I have
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03-11-2015, 09:36 PM
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#10 |
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Registered User
Join Date: Jan 2015
Location: Dell Ar.
Posts: 27
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Re: LS swap fuel system
One more pic
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03-11-2015, 09:40 PM
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#11 |
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Registered User
Join Date: Jan 2015
Location: Dell Ar.
Posts: 27
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Re: LS swap fuel system
Last one. Thanks for the help
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03-12-2015, 10:00 AM
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#12 |
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Registered User
Join Date: May 2010
Location: Mountain House, CA
Posts: 555
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Re: LS swap fuel system
I know see what you mean. I think that the extra hose is part of the '98 set up and may be the source of confusion. I would guess that the little hose is some sort of return line that the '98 set up uses.
My pump is out of a recalled ford product that was new and being thrown out. The 'goldish' piece on the sender body looks to me like a vapor separator of some sort.
__________________
My Chevy habit is paid for by Ford diesels... Here is my SLOW LS install: http://67-72chevytrucks.com/vboard/s...55#post6456355 Caliper Rebuild: http://67-72chevytrucks.com/vboard/s...d.php?t=613748 Upper Control Arm Bushings: http://67-72chevytrucks.com/vboard/s...d.php?t=616974 IG mattcrp1 |
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