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11-15-2013, 02:41 PM
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#1 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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87 fuel system in a 86
what will I need to do. I know tanks are a direct fit. Will 87 sending units hook up to all the 86 stuff? (wiring, hoses)
I am thinking on trying the new Holley Terminator. |
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11-15-2013, 05:26 PM
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#2 |
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Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: 87 fuel system in a 86
87 Fuel system includes in tank fuel pumps and was designed for TBI motors. 87 fuel units are different. 86 fuel system was designed for carb application - no in tank fuel pumps. TBI systems uses 3 lines - fuel supply, fuel return and vapor purge. In tank fuel pumps require switched power source - controlled by ECM.
What are you trying to accomplish with 86 to 87 swap?? //RF
__________________
"The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29)  New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17) |
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11-15-2013, 06:53 PM
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#3 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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Re: 87 fuel system in a 86
I want to use the new Holley Terminator EFI
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04-27-2015, 02:56 PM
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#4 |
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Registered User
Join Date: May 2010
Location: Shoals, AL
Posts: 299
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Re: 87 fuel system in a 86
I'm going to bring this back up. I have changed to a LS swap from the Holley EFI. What do I need to add/change to make the 1987 tanks and pumps work? I have the 1987 cab fuel valve switch. Do I just need to rewire from the switch to the valve connector, or will I have to add wire from the connector to the pumps?
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04-27-2015, 03:24 PM
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#5 |
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Registered User
 Join Date: Jul 2014
Location: Dayton, TX
Posts: 335
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Re: 87 fuel system in a 86
If you are staying with dual tanks, you will need the 87 and up tank switching valve along with the in cab dual tank switch. You will also need new fuel pumps for the 87 sending units. If I remember correctly, the 87 pumps were low pressure pumps and the LS needs roughly 58psi.
__________________
'83 Silverado Step Side '85 GMC short bed. '86 Chevy Step Side Custom Deluxe LQ9/4L80 swap (SOLD) |
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04-27-2015, 04:42 PM
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#6 |
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Registered User
Join Date: Jun 2012
Location: Minnesota
Posts: 509
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Re: 87 fuel system in a 86
I think you'll be time and money ahead to just do a single inline pump vs trying to get in tank pumps to work.
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04-27-2015, 06:02 PM
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#7 |
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Registered User
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
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Re: 87 fuel system in a 86
Well, if you already have everything working (dual tanks, switching valve, etc) then just run relay turn on wire to correct pin on your ECM, swap out fuel pumps for AC Delco EP381s, and plumb the 3/8 feed and 5/16 return to the fuel rail, or to a Corvette regulator filter if using a returnless rail. Should be fairly straightforward, especially since you already have EFI on the truck.
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