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Prong · 10-03-2009, 09:20 PM

If you have a 3 line fuel pump, then you need a 3 port sender. One for 3/8" fuel feed, a 5/16" vapor canister line, and a 1/4" that is the return from either the fuel pump, or the switching valve (if you have dual tanks). Otherwise, you need a 2 port sender. The 4 ports were used on Blazers and Subs IIRC.

10-03-2009, 09:20 PM	#2
Prong Registered User Join Date: May 2007 Location: CO Posts: 476	Re: 76 K10 Fuel sender and fuel questions If you have a 3 line fuel pump, then you need a 3 port sender. One for 3/8" fuel feed, a 5/16" vapor canister line, and a 1/4" that is the return from either the fuel pump, or the switching valve (if you have dual tanks). Otherwise, you need a 2 port sender. The 4 ports were used on Blazers and Subs IIRC.