whats the right fuel sending unit - 5/16 or 3/8 " pick up ?

[70bigblockdodge]

At least I'm not the only one had that thought. Those posts have been bugging me for some time now and I thought it was just me.

Not just you. Hit the Iggy button life is too short to put up with ignorant stupidity that you can control.
Stan has showed me the light.

 

[Sport Fury GT]

I had the 5/16ths sending unit and line on my 70 Sport Fury GT with a stock fuel pump. I tried to locate a 3/8ths unit, but could not find one. Upgraded the fuel line to 3/8ths and added a Carter high volume fuel pump. ET dropped from 14.5 to 14.15 with no other changes

 

[67Monaco]

Guess there's another one.