1972 K20 in cab tank fuel sending unit question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Threerun · 07-08-2019, 07:34 PM

Hey all.

My truck is a 1972 K20 Cheyenne LB, 350/TH350. My fuel sending unit has taken the long nap on me. Full tank of fuel- gas gauge reads past 3 O'clock. Never moves. Disconnect the brown sending unit wire, run a jumper from the brown lead to chassis ground- straight to empty...

Every on-line parts place shows a '72 automatic trans sending unit with two ports, and manual transmissions with one port. However the unit on mine (auto tranny) has only one port. My tank is not the ECC model..

I've done a search on here to just how a two port would be plumbed via a diagram, but I've come up blank.

Any ideas? Should I just get the sending unit for a manual tranny and be done with it?

07-08-2019, 07:34 PM	#1
Threerun Registered User Join Date: May 2017 Location: Helena, MT Posts: 80	1972 K20 in cab tank fuel sending unit question Hey all. My truck is a 1972 K20 Cheyenne LB, 350/TH350. My fuel sending unit has taken the long nap on me. Full tank of fuel- gas gauge reads past 3 O'clock. Never moves. Disconnect the brown sending unit wire, run a jumper from the brown lead to chassis ground- straight to empty... Every on-line parts place shows a '72 automatic trans sending unit with two ports, and manual transmissions with one port. However the unit on mine (auto tranny) has only one port. My tank is not the ECC model.. I've done a search on here to just how a two port would be plumbed via a diagram, but I've come up blank. Any ideas? Should I just get the sending unit for a manual tranny and be done with it?



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