Carburated: Tanks fit between the frame rails, are fully baffled and compatible with EFI or carbureted applications. Suburban tanks are designed to fill in the original location and all other tanks are available in a bed fill standard (-BS), which is accessible through a fuel fill door, in a bed fill flush (-BF), which is accessible through a flush mount cap and in a side fill (-S). These tanks are made from .125" 5051 aluminum and have a .187" mounting bracket. It's the thickest and strongest in the industry! #5559AGT is notched for leaf spring clearance and will NOT work on 1958-59 Fleetsides. Sending units sold separately. Note: Gas tanks ship O/S; additional freight charges apply. Also, 1947-54 tanks will not work on 3/4 ton. Fuel Injected tanks include in tank pumps. See chart at on second photo to choose the right tank.
1955-1959 20 Gallon Aluminum Gas tank
Required Parts: Fuel Line Hose Clamps 1/2” Vent Hose Fuel Level Sending Unit
1. Remove the bed from the truck.
2. Remove the spare tire mounting cross member. The cross member is located behind the shock mounts, and is attached to the bottom of the frame with one rivet on each end.
3. Using a floor jack against the bottom of the fuel tank, hold the fuel tank mounting flange tight against the bottom of the frame.
4. Using the flange backing strip as a template mark and drill three 3/8” holes thru the bottom of the frame and the tank mounting flange on each side of the fuel tank. For technical help call Classic Performance Products Monday thru Friday 8:30am to 5:00pm at (714) 522-2000. Rev. 12/2/2005 Parts List: 1 ea. 1955-1959 Fuel Tank 6 ea. 3/8-16 x1gr.8 Bolt 6 ea. 3/8 Lock Washer 6 ea.. 3/8 Flat Washer 2 ea. Flange Backing Strip
5. Position the flange backing strip in the channel of the frame as shown in the diagram below.
6. Bolt the fuel tank in place using the six 3/8 bolts, flat washers, and lock washers supplied with the kit.
7. Lower and remove the floor jack that was holding the fuel tank in place.
8. Thread the 1/2” 90° barbed fitting in to the bung located on the top of the fuel tank. Using a hose clamp connect a vent hose to the barbed fitting. (Make sure that the vent hose is safe for use with gasoline) The other end of the vent hose should be located 18” above the gas cap.
9. Be sure to read and follow the instructions that came with the sending unit. Check that the resistance of the sending unit is correct for the fuel gauge. Install the fuel tank sending unit thru the flange on top of the fuel tank. Align the top of the sending unit mounting holes with the threaded holes in the sending unit flange on the top of the fuel tank taking making certain that the float can not contact the sides of the fuel tank or the inner baffles. Tighten the sending unit with the 5 10-32 screws supplied with the fuel tank. For sending units equipped with a fuel hose fitting skip step 11. For sending units without a fuel hose fitting skip step 10.
10. Use a hose clamp to connect the fuel hose to the fitting located on the top of the fuel tank sending unit. The other end of this hose will need to go to a fuel pump. (It is recommended that a fuel filter is used between the fuel tank and fuel pump.) Seal the threaded bung on the bottom of the fuel tank with a 3/8 NPT plug.
11. Install the 3/8” 90° barbed fitting into the threaded bung at the bottom of the fuel tank. Use a hose clamp and connect the fuel hose to the barbed fitting. The other end of this hose will need to go to a fuel pump. (It is recommended that a fuel filter is used between the fuel tank and fuel pump.)
12. A second 3/8” threaded bung is provided for fuel injected applications that require a fuel return line, plumb as necessary. If a fuel return line is not needed install the 3/8” plug in to this threaded bung. (Do not use the fuel tank until both the 3/8” bungs are plumbed!)
13. Install the bed onto the truck
14. Cut an access hole thru the bed above the gas cap