If you have a nice flat spot on your fuel tank, this is the easiest way to get a factory fuel pump module in your tank. And if you cut the hole with non-sparking tools (like a nibbler) you can modify a used tank without risk (do flush it thoroughly first).
This ring seals to the top of your tank with a viton o-ring, and is held in place with a clamping ring and lock nuts.
A side benefit of installing this flange is that it gives you access to the inside of your tank to clean it out.
Now why would you want to do that?
- OEM reliability- Factory parts generally work better and are more durable
- Get the fuel pump into the tank so its quieter
- The OEM fuel sump prevents sucking air. No surge tanks, baffles, etc needed. This is important protection for your engine
- Built in regulator/returnless- the regulator is in the OEM module, and keeps your fuel at 58 PSI. No return line needed
- Built in fuel level sender, or you can of course keep your original in the tank as well. GM ones are 235 ohm empty and 40 ohms full
- Buy a fuel pump module for a 2004-2007 Silverado or Sierra 1500 or 2500 (gas, NOT flex fuel) if your tank is 11-13” deep
- Buy one for a 2004-2007 suburban 1500, escalade, or Yukon XL (gas, NOT flex fuel) if your tank is 7-9” deep.
- Buy one for a 2004-2008 express/savanna van if your tank is 14-10.5” deep
These pump modules will sit against the bottom of your fuel tank, and they have spring loaded guide rods to adjust and hold them down.
With some modifications, it may be possible to get these modules to work with other tank depths as well.
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