78 K-10 Dual Tank Install

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David House

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Apache Junction Arizona
First Name
Dave
Truck Year
1978
Truck Model
K10
Engine Size
350
When I bought my 1978 K-10 it only had the passenger side tank and the selector switch and selector valve are long gone. I want to install both tanks, the selector valve and the selector switch and put it back to stock as much as possible. Can anyone point me to the wire and plumbing diagrams so I can recreate a working system? Thanks
 

75gmck25

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Northern Virginia
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Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
If you have a three port fuel pump with a return line, the hard part of a near stock conversion is to find the old-style 6 port tank solenoid (no longer sold new) that only requires a single powered wire to switch. I’m not sure if the ‘78 used the newer 6 port solenoid that has a multi wire connection, or the old single wire switch.

Bruce
 

AuroraGirl

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Northern Wisconsin
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Taylor
Truck Year
1978, 1980
Truck Model
K10, K25
Engine Size
400(?), 350
my stock 1980 has this kind, no idea what it is. in a bucket somewhere, i saw one that came out of a 79 or 78 best i can tell. It matched. But it may not have been original or retrofitted or from a different truck. i say 78 because i have the fuel tanks for a 78 k10 and the switch for that truck was in the same bucket as the valve. i cant imagine they are good anymore(the valves) but hopefully it helps

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AKguy

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Randy
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1981
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The folks at EFI System Pro can hook you up.
 

C10MixMaster

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Kingman AZ
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Ben
Truck Year
1977
Truck Model
C10 BIG10
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ZZ4 350
1977 wiring
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1979?- 1986
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1987 with intank pumps
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78C10BigTen

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pennsylvannia
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Ted
Truck Year
1978
Truck Model
C10 BIG TEN
Engine Size
350
If you have a three port fuel pump with a return line, the hard part of a near stock conversion is to find the old-style 6 port tank solenoid (no longer sold new) that only requires a single powered wire to switch. I’m not sure if the ‘78 used the newer 6 port solenoid that has a multi wire connection, or the old single wire switch.

Bruce
78 was 3 port single wire. Mine is....
 

eskimomann209

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Modesto
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Marcus
Truck Year
1973
Truck Model
C10
Engine Size
5.3
@gmachinz makes a whole plug n play wiring kit. Comes with the selector valve and dash switch. You gotta run the plumbing for the fuel lines tho.
 

David House

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Location
Apache Junction Arizona
First Name
Dave
Truck Year
1978
Truck Model
K10
Engine Size
350
Thanks for all the input, I appreciate it, I'm going to try and plumb/wire it back to a stock setup as much as possible. If I were keeping the truck I would probably go with the two electric pump system though.
 

taggtwo

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Spokane, Wa
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Tim
Truck Year
1987
Truck Model
K20
Engine Size
383
Jabin, has had my power window harness for about three months now. He must be busy. I sure would like to have it back!!
 

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