The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Dual tanks: any way to manually force alternate tank

**hatzie** · 09-08-2019, 11:29 PM

If you have a 73-80 truck it's easy enough to change the AUX tank from the LH to the RH side.

Swap the supply and return hoses from the LH & RH senders on the valve.
Unplug the Packard plug from the switch.
-One side of the plug has a blocked off angled terminal hole and a RED and Green wire. This side powers the valve with the switch in the AUX position.
-The sender side of the plug has two angled terminals and one straight terminal. This is the sender switch. The output to the gauge is on the centre terminal and the wires from the senders are in the corners. Swap the corner wires to make the gauge read the proper tank after you swap the hoses around.

This is the dual tank theory of operation thread. It should answer a lot of questions.
http://67-72chevytrucks.com/vboard/s...d.php?t=754061

09-08-2019, 11:29 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,915	Re: Dual tanks: any way to manually force alternate tank If you have a 73-80 truck it's easy enough to change the AUX tank from the LH to the RH side. Swap the supply and return hoses from the LH & RH senders on the valve. Unplug the Packard plug from the switch. -One side of the plug has a blocked off angled terminal hole and a RED and Green wire. This side powers the valve with the switch in the AUX position. -The sender side of the plug has two angled terminals and one straight terminal. This is the sender switch. The output to the gauge is on the centre terminal and the wires from the senders are in the corners. Swap the corner wires to make the gauge read the proper tank after you swap the hoses around. This is the dual tank theory of operation thread. It should answer a lot of questions. http://67-72chevytrucks.com/vboard/s...d.php?t=754061 __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.