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#1075231 09/20/22 03:01 PM
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Why doesnt someone make a fuel tank for a G body to allow me to mount a stock GM fuel sending unit? Or at least make the top of the tank flat enough in a big enough area to allow me to cut a bigger hole & weld in a mounting ring for the OEM unit.

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'85 and up 4.3 TBI or GN tank and sender should do it, right? I started with one stock and just switched the pump in the stock sending unit from the low pressure TBI pump to a Walbro 255 and it was done. No reason a walbro 455 wouldn't work these days, I don't think. Coming from a carb, you would have to run a fuel pump power wire, I believe there's some Hotwire kits out there that ought to work pretty well.


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Originally Posted by Hunter79764
'85 and up 4.3 TBI or GN tank and sender should do it, right? I started with one stock and just switched the pump in the stock sending unit from the low pressure TBI pump to a Walbro 255 and it was done. No reason a walbro 455 wouldn't work these days, I don't think. Coming from a carb, you would have to run a fuel pump power wire, I believe there's some Hotwire kits out there that ought to work pretty well.


Yes an EFI tank from a TBI or GN will work. An OEM fuel sending unit is a much better design, doesn't require a sumped/baffled tank, & with supercharger & OEM ECM/controller, can use a PWM pump (ZLI pump) & then no need for a pressure regulator.

Just seems like a simple solution, sonce there are a lot of aftermarket suppliers making tanks, that one could be made to use the OEM fuel sending unit.

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Originally Posted by Tunedss86
Originally Posted by Hunter79764
'85 and up 4.3 TBI or GN tank and sender should do it, right? I started with one stock and just switched the pump in the stock sending unit from the low pressure TBI pump to a Walbro 255 and it was done. No reason a walbro 455 wouldn't work these days, I don't think. Coming from a carb, you would have to run a fuel pump power wire, I believe there's some Hotwire kits out there that ought to work pretty well.


Yes an EFI tank from a TBI or GN will work. An OEM fuel sending unit is a much better design, doesn't require a sumped/baffled tank, & with supercharger & OEM ECM/controller, can use a PWM pump (ZLI pump) & then no need for a pressure regulator.

Just seems like a simple solution, sonce there are a lot of aftermarket suppliers making tanks, that one could be made to use the OEM fuel sending unit.


I used a spectra TBI Monte tank with a GN hanger and a Aeromotive Stealth 340lph, and a corvette filter regulator. Note on the spectra tank, look into improving the vent while filling, I have to drizzle gas into the tank - the one downside.


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I couldn't even get Ricks Tanks to talk to me about building a tank for the G body... Someone said they were building one now but I haven't verified this.

I and several others just went the route of putting a pan in the top of an OEM replacement tank with a ring to install a late model fuel module and left the OEM sending unit and vent lines intact and everything works fantastic. I ended up with about $1,000 in the setup all in with corner pickups and everything and haven't had to think about my fuel system since.


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Anyone know if the 68-74 A body tank is close to the same size, will it work?

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I also run a walbro 255 pump inside my GN tank. Fearing electric fuel pump failure and having to drop a full tank to change it, I added a "door" on the bottom of the trunk floor. This allows me to service the fuel system without having to remove the tank.


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Originally Posted by Tunedss86
Why doesnt someone make a fuel tank for a G body to allow me to mount a stock GM fuel sending unit? Or at least make the top of the tank flat enough in a big enough area to allow me to cut a bigger hole & weld in a mounting ring for the OEM unit.

Probably because with standard production LS engines, the fuel tank is considered part of their low emission systems due to them having Enhanced EVAP which includes a tank pressure sensor. Most LS swappers don't care about emission legality issues and aftermarket manufacturers don't want to spend the high costs to both develop emission legal parts and having them govt certified.

Of course the Erod crate packages side steps this issue by using a non enhanced EVAP system that works with old car gas tanks. Enhanced EVAP systems do not work well with non enhanced gas tanks found in most pre OBD2 cars.


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Ricks makes one for a chevelle that uses OEM Fuel module.


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Over the years...I've collected a few GN and a TBI 4.3 Monte tank. Not exactly what you were asking but accidentally found this browsing for who knows what...


1985 GMC Caballero 4.3L V6 TBI 200C w/ 2.41 posi
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Yeah not what I was asking, but thanks.

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[/quote]

Note on the spectra tank, look into improving the vent while filling, I have to drizzle gas into the tank - the one downside.[/quote]

Same here...and here I thought I did something wrong! grin


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I asked Rick's tanks if they were planning on making a G body fuel tank that uses the GM sending unit, like the one shown above for the Chevelle. They said they didnt have enough sales on the G body tank they have now to justify spending the $ on retooling for use of the GM sending unit.

Their current G body tank is this unit:
[Linked Image from tanksinc.com]

That uses this fuel level sensor:
[Linked Image from tanksinc.com]

And this fuel pump module:
[Linked Image from tanksinc.com]

Well no xxxx you aren't selling much of it. I wouldn't take that if it was given to me. Those parts look like afterthoughts, like they hurried to make something with what was laying around to try to meet the need, held on with multiple screws, and electrical connections that shouldn't be used in non weatherproof locations.
[Linked Image from tanksinc.com]

But what do i know.

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That sort of looks like the Tanks Inc. hanger...mine was a disaster. I later went to a 4.3L Monte Fuel tank and hanger from Spectra. I did have to alter wiring to the fuel pump, so that it would work with the Walbro 255. It takes a long time to fill the tank.


-'87 Monte SS LS 2/4L65e Quick Perf. 9" w/disk brakes
-'89 Iroc Z28 Stock 5.7 Edelb. TES headers, Borla Exhaust90K
-'77 Trans Am 468(Stroked) Doug's Headers Flowmaster catback
B & M shift Kit 400 Turbo trans. Edel brock Performer
RPM Intake Sean Murphy built Rochester Carb. Restored
in '08. 3K
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Originally Posted by jmireles
That sort of looks like the Tanks Inc. hanger...mine was a disaster. I later went to a 4.3L Monte Fuel tank and hanger from Spectra. I did have to alter wiring to the fuel pump, so that it would work with the Walbro 255. It takes a long time to fill the tank.

My bad, it was Tanks Inc that I contacted.


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