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Re: 1973-1991 Dual fuel tank systems theory of operation
It sounds like someone wired past the valve directly to the LH sender.
The valve and switch are working as they should.
Does the SPID (Service Parts Identification) label in the glovebox call out Option NL2?
The six position Weatherpak on the valve is lettered A-F. F should not have a wire so A is on the opposite end of the plug... easy to find.
With your Digital Volt Ohmmeter. What ohmage do you get when checking resistance between Valve plug A to ground & Valve plug C to ground. One of them should be 90Ω ish and the other should be somewhere around 29Ω ish... give or take a few Ω. The graph in my post above shows Ohms VS gauge position.
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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... 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.
Last edited by hatzie; 03-06-2020 at 09:44 AM.
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