Engine Harness Routing Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**72malibu** · Yesterday, 11:20 AM

Working on a 75 but it should be the same for various years.

Does the fuel tank sending unit wire (tan with a boot on the end) route through the metal starter wire tube along with the starter wires, and then back to the tank, or does it not go into that tube?

For the life of me, I can't find any internet photos showing it.

Pontiac1976 · Yesterday, 03:04 PM

no.
Should come out of the back side of the trans near the dist T down the right, frame to tank .

cadillac_al · Yesterday, 05:03 PM

Mine goes through the tube. It seems to work out well. I don't know if I would have thought of that myself and I usually like to leave stuff the way the factory did it. I have replaced the engine and trans in my truck though.

**72malibu** · Yesterday, 05:43 PM

I've got a new M&H harness. They make them just like the factory did.

The sending unit wire comes out the end of the plastic split loom with the starter wires. The split loom is taped around the end. The split loom is snug against the opening of the steel tube. So, if I leave the sending unit wire out of the steel tube, it's going to chafe on the edge of the tube unless I modify the harness somehow. That's why I'm thinking the sending unit wire must have gone through the tube toward the starter and then backward to the fuel tank.

Yesterday, 11:20 AM	#1
72malibu Active Member Join Date: Jun 2019 Location: Gaithersburg, MD Posts: 142	Engine Harness Routing Question Working on a 75 but it should be the same for various years. Does the fuel tank sending unit wire (tan with a boot on the end) route through the metal starter wire tube along with the starter wires, and then back to the tank, or does it not go into that tube? For the life of me, I can't find any internet photos showing it.

Yesterday, 03:04 PM	#2
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 780	Re: Engine Harness Routing Question no. Should come out of the back side of the trans near the dist T down the right, frame to tank . __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.

Yesterday, 05:03 PM	#3
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,389	Re: Engine Harness Routing Question Mine goes through the tube. It seems to work out well. I don't know if I would have thought of that myself and I usually like to leave stuff the way the factory did it. I have replaced the engine and trans in my truck though. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

Yesterday, 05:43 PM	#4
72malibu Active Member Join Date: Jun 2019 Location: Gaithersburg, MD Posts: 142	Re: Engine Harness Routing Question I've got a new M&H harness. They make them just like the factory did. The sending unit wire comes out the end of the plastic split loom with the starter wires. The split loom is taped around the end. The split loom is snug against the opening of the steel tube. So, if I leave the sending unit wire out of the steel tube, it's going to chafe on the edge of the tube unless I modify the harness somehow. That's why I'm thinking the sending unit wire must have gone through the tube toward the starter and then backward to the fuel tank.



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