Buick GNx sending unit and pump

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theIrishman

Not-quite-so-new-guy
May 27, 2018
18
18
3
Has anyone had success with using a Buick Grand National fuel tank sending unit and pump (or aftermarket high volume/pressure pump) in a 1978 and up Malibu fuel tank, Ls 5.3?

Or has anyone modified an original Malibu sending unit to work with an in-tank electric pump, and added a return line?
 
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Pronto-

Apprentice
Dec 4, 2014
84
78
18
If your going FI then you want the tank for a Turbo Buick with the dog dish and splash guard so you don't end up sucking air on a hard corner or launch.
 
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UNGN

Comic Book Super Hero
Sep 6, 2016
3,048
3,264
113
Southlake, TX
A GN tank has a sheet metal wall that runs down the middle:

T-type tank 2.jpg


Doesn't do much for corners, but makes sure the pump doesn't suck air when accelerating. Carbs have bowls and don't have to worry about a couple seconds of air..
 

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MC96

Master Mechanic
Dec 7, 2015
458
492
63
Ive been told the FI sender in a non efi tank isnt a big deal in autocross, as long as you have it above 1/4 tank.

I would imagine you wouldnt see many issues street driving it
 

20Grand

Apprentice
Mar 16, 2018
59
10
8
I’m using a fuel tank from a Monte, about the same as your GI, and just drove it across the country. I’m using an AC Delco pump tho.
 

20Grand

Apprentice
Mar 16, 2018
59
10
8
But, I think you can get away with the stock tank with upgraded pump and sending unit. My mechanic that builds LS swaps also confirmed, but wanted to be safe on long distance trips. If you do the swap, order without fuel tank neck and order YOUR fuel neck and install.
 
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