Systems and methods for installing and sealing fuel pump in fuel tank

1. A method for installing and sealing a fuel pump in a fuel tank, comprising:

providing an opening in a fuel tank;

securing a split clamping ring, of a fuel pump hanger assembly, adjacent to the opening on the inner surface of the fuel tank;

positioning a plurality of clamping lugs of the fuel pump hanger assembly through the opening and through the split clamping ring;

inserting a fuel pump hanger assembly into the opening;

securing a plurality of assembly screws in the top of the fuel pump hanger assembly; and

moving said clamping lugs from a generally circumferentially aligned first elevation adjacent to a lower surface of one of a plurality of bosses to a second elevation, non-circumferentially aligned position, and causing the plurality of clamping lugs to move to a position at least partially radially outward of the opening, and to engage an adjacent one of said plurality of bosses and tighten against the split clamping ring.

2. The method of claim 1 , further comprising guiding the clamping lugs through the opening with the plurality of bosses.

3. The method of claim 1 , further comprising rotating the plurality of assembly screws to move said clamping lugs.

4. The method of claim 3 , further comprising moving said plurality of clamping lugs vertically with said rotation of the plurality of assembly screws.

5. The method of claim 1 , further comprising:

inserting a split clamping ring into the opening; and

adhering the split clamping ring to the interior tank surface proximate the opening.

6. The method of claim 1 , wherein the opening in a top surface of a fuel tank is through a corrugated portion of the top surface.

7. A method for uninstalling a fuel pump sealed in a fuel tank, comprising:

loosening a plurality of assembly screws in a top plate of a fuel pump hanger assembly;

unclamping a plurality of assembly lugs from a split clamping ring on an inside surface of a fuel tank;

rotating the plurality of assembly lugs from against the split clamping ring toward a generally circumferentially aligned position radially inward of an opening in said split clamping ring against a plurality of internal stops in the top plate to allow passage of the lugs through an opening in the fuel tank, and changing the position of the plurality of assembly lugs away from said split clamping ring and into the fuel tank; and

removing the fuel pump hanger assembly from the fuel tank.

8. A method of installing a fuel pump in a fuel tank, comprising the steps of:

providing a fuel tank with an opening;

applying a split clamping ring adjacent to the opening on an interior surface of the fuel tank;

providing a fuel pump hanger assembly with a gasket to engage an outer surface of the fuel tank having said opening;

providing a top wall of said fuel pump hanger assembly with a plurality of assembly screws extending through the top wall;

positioning a plurality of assembly lugs on a lower side of the top wall through the opening;

rotating said plurality of assembly screws;

moving each of said plurality of assembly lugs from a generally circumferentially aligned radially inward of said opening, first elevation adjacent to a lower surface of one of a plurality of bosses to a second elevation, non-circumferentially aligned position radially outward of said opening, causing the plurality of clamping lugs to engage an adjacent one of said plurality of bosses and tighten against the split clamping ring;

engaging said split clamping ring with said plurality of assembly lugs to lock said fuel pump hanger assembly in position.