Fuel sending unit help

codfish

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gary
Truck Year
84
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K10
Engine Size
350
Installing a Holley sniper on my 84 k10. Single drivers side tank.

Dropped the tank to modify the sending unit for the return line, and found this.

The 1/4 line was pretty much plugged, so I cleaned it out. The 3/8 supply line is fine.

The middle line, the 5/16 line. Where does it return to??

I guess I’ll need to buy a sending unit without that “cup” on the bottom!!

Great!! Can’t see no way to remove it without destroying it.

Codfish
 

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Scott91370

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On my 82 and 85 the third line ran up front to the charcoal canister.
 

75gmck25

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On my truck the third port has a T connection to the other tank and then one line runs to the charcoal canister under the hood.
 

fast 99

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The 5/16 line vapor recovery and vent. Will need to change gas cap to vented style or if the recovery system is all there hook it back up.
 

gogo14910

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My 5/16 was fuel to engine, 3/8 was return unused fuel to tanks and the 1/2 was vent. I’m 7 days behind, did you get it all squared away? These are photos of my deleteing the passenger tank and the tank selector valve.
 

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codfish

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Newfoundland
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gary
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K10
Engine Size
350
I ended up getting a new sending unit that I could drill a 9/16” hole for the sniper return line. I only have the single tank, and I deleted all the stock fuel system except the tank, which is new.

Thanks
Codfish
 

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