1974 mach1 fuel sending unit

Aug 21, 2017
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#1
So I'm looking online for a sending unit and I'm seeing some with 1 outlet and some with 2. The one on my tank has 2. Was wondering why there are 2 different ones and if it matters. Probably a dumb question but oh well lol
Eddie
 
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Oct 17, 2015
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#2
Mine has two also, where one is plugged off under the engine.
No idea why there is two though....
 
Aug 21, 2017
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#3
Yeah idk unless it's a return or something
 
Aug 21, 2017
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#5
Lol long as it works
 

jozsefsz

5 Year Member
Aug 11, 2013
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#6
I honestly don't know why some have 1 and some have 2, mine has 1 outlet line.
Usually a 2nd line on the sending unit is a vent line, but with the sending unit on II's near the bottom of the tank that'd just be venting liquid gasoline.
The vent to the charcoal canister on II's is up at the top as well, and it's separate from the sending unit.
It'd be interesting to trace where the second line goes on a complete car.
 
Aug 21, 2017
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#7
I will do that when I get home and let you know. I'm curious myself now