Re: Sending unit question
The third tube is your return line. If you have a return line from the fuel pump you need all three.
Not sure exactly when the return line became standard equipment but I believe it was available in the early 70's...
I don't believe you can install 20 gallon tanks with a 6' box.
16 & 20 gallon pickup tanks are the same depth so they use the same supports and the same senders. Blazer and Suburban tanks have differing depths.
The senders are side specific but the supports are not.
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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.
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