1963-1967 Corvette Gas Tank Installation

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1963-1967 Corvette Gas Tank Install from GasTanks.com

We are pleased to present the following detailed installation instructions for a Quanta Products GasTanks.com GM-33A gas tank. This tank is appropriate for a 1963-1967 Chevrolet Corvette. GasTanks.com GM-33B thru GM-33G tanks are applicable to 1968-1974 Corvettes and are similar to the GM-33A and install in a similar fashion tank but require somewhat different parts. Only the Quanta Products GasTanks.com gas tanks have the O.L. Anderson logo embossed into the tank as original. (Available only from Quanta Product and select dealers that carry our tanks)

Removal

Step 1. Remove the battery cable from the battery.

Step 2. Remove the spare tire lock and drop the spare tire from the tire carrier tub. Remove the spare tire.

Step 3. Unscrew and remove the two spare tire carrier front-most long bolts.

Step 4. Remove the two bolts from the bracket at the rear of the spare tire carrier tub.

Step 5. Remove the four tub mounting bolts and washers. Set the tub in a safe place.

Step 6. Remove the exhaust pipe "U" bolts at the exhaust tip connection.

Step 7. Remove the exhaust pipe "U" bolts at the crossmember (near the transmission). Unbolt the rear mufflers hanger brackets at the frame. The exhaust system can now be separated and moved to allow more room to remove the gas tank.

Step 8. Disconnect the overflow hose strap from the bumper bracket.

Step 9. Disconnect the sending unit meter wires from the sender.

Step 10. Disconnect the rear rubber fuel line where it connects to the steel front to back fuel line and completely drain old gas tank and fuel line to a fuel container. Assure that this is done in a well ventilated area with no open flames or ignition sources present. Note that the Corvette gas tank holds up to 18 gallons so you will need a container with sufficient capacity to accommodate the fuel.

Step 11. Remove the gas cap. The filler neck boot, drain nipple and drain hose can be removed.

Step 12. The nine filler neck screws can be removed and the filler neck can be removed. For coupes it should be removed.

Step13. Spray Prelube 6 part number 05-10) on the Corvette gas tank strap carriage bolts and nuts, and the tank support cross brace bracket nuts (4). Let these parts soak for awhile. Remove the nuts from the two gas tank strap carriage bolts.

Step 14. Remove the four nuts and bolts from the rear gas tank cross support bracket.

Step 15. Carefully remove the cross bracket while supporting the tank.

Step 16. Carefully rotate the tank forward and lower the Corvette gas tank to the ground.

Step 17. Remove and discard old straps and hardware if beyond hope. If not, paint straps with Quanta System 5 Semigloss spray (Quanta Products part number 06-08)

Step 18. If new fuel line is needed, replace it now with a Quanta Products GasTanks.com steel or stainless steel fuel line available in the Fuel Lines section of this site.

Step 19. The removed fuel tank will look something like this, but usually much worse. This tank was from a low mileage car.

Step 20. Use the retaining cam (lock ring) removal tool, part number 20-LRW to remove and examine the old sending unit.

Step 21. A rubber O-ring comes with Quanta Products GasTanks.com Corvette gas tank and sending unit. It is also sold separately as part number 20-13. Soak the o-ring in motor oil for a few minutes to aid subsequent installation.

Step 22. Place the o-ring in the sending unit hole

Step 23. Insert the new sending unit (Quanta Products part SU33-1 or 20-10A) into the sender hole in the new tank being careful not to cut the float or filter sock in the process.

Step 24. The sending unit is indexed to the tank gauge hole so that the tube faces the correct direction.

Step 25. Place the retaining cam (lock ring), which is included with each Quanta Products GasTanks.com gas tank or sending unit, over the sender and use the retaining cam (lock ring) tool (20-LRW), pressing down and turning the lock ring. The retaining cam is also sold separately as part number 20-14.

Step 26. Each 1963-67 Corvette tank was stenciled at O.L. Anderson prior to shipping to St. Louis for installation. Quanta Products sells GM licensed gas tank stencils for you to stencil your new tank. Stencils were black or white, depending on the year. Stencils usually contain the destination plant and the part number, although deviations exist. Tank stencils can often be found on the sides of the original tanks and we are please to match yours if you so choose. Select Quanta Products part number 02-03A or 02-03B gas tank stencil.

Tape the stencil to the side of the tank.

Step 27. Stenciled numbers were often applied with a brush or roller but fast drying spray stencil ink is much more convenient. Select Quanta Products GasTanks.com part number 07-17D or 07-17A.

Brush marks or roller marks often go over the edge of the stencil as was found on the original tank. This can easily be duplicated.

If dealing with a convertible of a body off frame coupe, follow steps 28-30. If not, the filler neck should be installed after the tank is in place. Jump to step 31

Step 28. Place the cork gasket, included with every Quanta Products GasTanks.com tank, in place on the filler neck hole.

Step 29. Place the Convertible filler neck in place.

Step 30. Screw the screws, included with every Quanta Products GasTanks.com tank, in place and take turns around the neck tightening evenly and securely but not so tight that the filler neck flange becomes distorted.

Step 31. Place a line of 3M yellow weatherstrip adhesive along the edges of the gas tank. Carefully place the antisqueak strips in place. Antisqueak strips are Quanta Products GasTanks.com part number 20-15.

"Body On" installation instructions

For a Coupe installation jump to step 35

Step 32. For a Convertible, install the rubber boot (tank to body seal) Quanta Products GasTanks.com part number 20-16, drain nipple 20-17, drain hose 20-32A and drain hose spring, 20-32B. Connect the drain hose strap 20-47A or 20-47B to the bumper bracket once the gas tank is lifted in place. Note that we sell a convenient Gas Tank Overflow kit 20-55 (1963) or 20-56 (1964-67) that contains all the parts needed for this installation. Install a new gas cap 20-19A.

Step 33. Hook the new gas tank strap, Quanta Products part number 20-26A, in the frame. Lift and rotate the tank into place and set it on the rear frame rail assuring the antisqueak strips are properly placed. Reinstall the cross brace with new hardware Quanta Products part number 20-31A.

Step 34. Assure that the straps are stretched over the tank to the bracket. Use part number 20-28, Corvette hold down guide brackets and 20-27B hardware to secure the tank in place. Jump to Step 39

Step 35. Coupe - Place the cork gasket, included with every Quanta Products GasTanks.com tank, in place on the filler neck hole.

Step 36. Place the Coupe filler neck in place.

Step 37. Screw the screws, included with every Quanta Products GasTanks.com tank, in place and take turns around the neck tightening evenly and securely but not so tight that the filler neck flange becomes distorted.

Step 38. Install the rubber boot (tank to body seal) Quanta Products GasTanks.com part number 20-16, drain nipple 20-17, drain hose 20-32A and drain hose spring, 20-32B. Connect the drain hose strap 20-47A or 20-47B to the bumper bracket once the gas tank is lifted in place. Note that we sell a convenient Gas Tank Overflow kit 20-55 (1963) or 20-56 (1964-67) that contains all the parts needed for this installation. Install a new gas cap 20-19A.

Step 39. Utilize Quanta Product GasTanks.com fuel line rubber hose kit 20-35A (1963) with tower clamps included, or 20-35B, with green hose clamps included to connect the fuel line to the gas tank sending unit.

Step 40. Reinstall the spare tire carrier tub and tire.

Step 41. Hook the sending unit harness wires to the sender and install the ground wire.

Step 42. Pour a small amount of fuel into the tank and assure no leaks at the sending unit and fuel line connections

Step 43. Install the gas cap Quanta Products GasTanks.com part 20-19A. The 1963-1967 gas tank is unvented and requires this vented cap. Do not use the later unvented gas cap on this tank!

Step 44. Reconnect the exhaust system a the transmission cross brace area. Adjust the mufflers for proper fit and exhaust tip placement.

Step 45. Reconnect the exhaust hangers to the mufflers. Attach the exhaust tip "U" bolts.

"Body Off Frame" installation instructions

Step 32alt. Reinstall the cross brace with new hardware Quanta Products part number 20-31A.

Step 33alt. Hook the new gas tank strap, Quanta Products part number 20-26A, in the frame and stretch over the tank to the bracket. Use part number 20-28, Corvette hold down guide brackets and 20-27B hardware to secure the tank in place.

Step 34alt. Utilize Quanta Product GasTanks.com fuel line rubber hose kit 20-35A (1963) with tower clamps included, or 20-35B, with green hose clamps included to connect the fuel line to the gas tank sending unit.

Step 35alt. Install the rubber boot (tank to body seal) Quanta Products GasTanks.com part number 20-16, drain nipple 20-17, drain hose 20-32A and drain hose spring, 20-32B. Connect the drain hose strap 20-47A or 20-47B to the bumper bracket once the body is back on the car. Note that we sell a convenient Gas Tank Overflow kit 20-55 (1963) or 20-56 (1964-67) that contains all the parts needed for this installation.

There you have it, a striking new GasTanks.com gas tank that will provide you many, many years of dependable service. This is the only tank with the O.L. Anderson logo as original, stenciled to exactly match your original installation.