Fuel tank in place where the spare tire is located.

[87carl]

Idk much but the 39 gallon tank or if it would work in the 1500 burbs. Mine is regular gas not flex is psi same

 

[swathdiver]

That 39 gallon NNBS tank is the route I would go.

I was unaware that a 39 gallon tank was available for the Burbs.

The 39 was only available on the 2500’s.

Idk much but the 39 gallon tank or if it would work in the 1500 burbs. Mine is regular gas not flex is psi same

The 2500 GMT800s and GMT900s had TWO fuel tanks, a 26 gallon tank in the usual place and an 11.5 gallon tank above the spare tire. The GMT400s had a 42 gallon fuel tank.

 

[kbuskill]

Idk much but the 39 gallon tank or if it would work in the 1500 burbs. Mine is regular gas not flex is psi same

I'm not 100% sure about the non-flex fuel as I don't have one.

The fuel pumps on this generation aren't as simple as the old ones.

They are not just On or Off.

They have a fuel pressure control module and can ramp the pressure up and down as needed.

In the Tech 2 you can watch different parameters for the fuel pump and you can see the commanded pressure and the actual pressure.

 

[iamdub]

I'm not 100% sure about the non-flex fuel as I don't have one.

The fuel pumps on this generation aren't as simple as the old ones.

They are not just On or Off.

They have a fuel pressure control module and can ramp the pressure up and down as needed.

In the Tech 2 you can watch different parameters for the fuel pump and you can see the commanded pressure and the actual pressure.

And you can tune the FSCM (Fuel System Control Module) if you buy a third credit, at least with HPT.

 

[87carl]

And you can tune the FSCM (Fuel System Control Module) if you buy a third credit, at least with HPT.

What do you mean credit

 

[kbuskill]

What do you mean credit

He is referring to custom tuning with HP Tuners. You have to pay for credits for each individual module you want to tune.

Examples... ECM, TCM, FSCM... etc.

 

[87carl]

I'm not 100% sure about the non-flex fuel as I don't have one.

The fuel pumps on this generation aren't as simple as the old ones.

They are not just On or Off.

They have a fuel pressure control module and can ramp the pressure up and down as needed.

In the Tech 2 you can watch different parameters for the fuel pump and you can see the commanded pressure and the actual pressure.

He is referring to custom tuning with HP Tuners. You have to pay for credits for each individual module you want to tune.

Examples... ECM, TCM, FSCM... etc.

Ok I don't know alot about tuning. And that fuel control module along with the fuel pressure sensor are what I figured regulates fuel pressure inatead of a pressure regulator. Can a normal fuel pump work with the rise and drop in amperage or voltage whatever it does to make it pump more or less? Or does it need to be a special type of pump? if it can't work I can probably use a modern ones pump in the obs sending unit I gotta look into that

 

[87carl]

What I'm finding is our fuel pump control module is a pulse width module so I need to find a variable voltage pump that will fit the 99 sending unit

 

[Rocket Man]

What I'm finding is our fuel pump control module is a pulse width module so I need to find a variable voltage pump that will fit the 99 sending unit

Or make the NNBS fuel pump fit the lock ring and mount on the OBS tank by cutting it down like I suggested to you. It’s the same design so just replicating the smaller diameter of the OBS pump flange should work. They make weld-in mounts for all the GM fuel pumps that include lock rings but since the factory tanks are all plastic that won’t work. I have an aluminum fuel cell in my bagged Silvy that uses a stock pump that I cut down on height so it would fit. It’s not that hard to modify a pump or mount so you can install the factory pump for your application, it’s a pretty simple design.

 

[992dr]

What I'm finding is our fuel pump control module is a pulse width module so I need to find a variable voltage pump that will fit the 99 sending unit

I don't see why this wouldn't work. Easy Peasy

Jazz Fuel Cell Filler Plate For Oem Silverado Pump/ Sending Unit | Izzy Fab