Johnson Service Bulletin SB-987, issued October 18, 1963, explains how to relocate a fuel-line primer bulb from the fuel-tank end of the hose to the motor end while maintaining correct fuel-flow direction.

Johnson Motors Service Bulletin letterhead

October 18, 1963 SB-987

SUBJECT:  Location of Fuel Line Primer Bulb

There are some customers who are apparently interested in having the primer bulb relocated from the gas tank end to the motor end of the fuel line. This is evidenced by occasional inquiries from dealers who ask whether or not such a modification will work; and, if so, what procedure should be followed when changing the location of the primer bulb.

This modification is relatively easy when performed as follows. Note first, that the connectors at opposite ends of the fuel line are identical, making it possible to hook either connector to tank or motor.

Figure 1: primer bulb, hose clamps A and B, and direction of fuel flow
Figure 1

1. Attach fuel hose connectors to tank and motor so that primer bulb is at motor end.

2. Disconnect fuel hose from both ends of primer bulb by removing hose clamps A and B as shown in Figure 1.

Figure 2: Johnson gasoline tank and hose placement
Figure 2

3. Remove white illustration band marked "tank end" from short three inch section of hose. Slip this band over entire length of twelve foot hose section so that it is adjacent to connector at tank end. (Figure 2).

4. Turn primer bulb end for end so that flow arrow points toward motor (direction of fuel flow) - See Figure 3. Complete this operation by connecting fuel lines to primer bulb. Make sure hose clamps are secure.

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SB-987
Page 2

Figure 3: primer bulb positioned near the motor, arrow indicating fuel flow
Figure 3

Carburetor may now be primed as required. Relocating the fuel primer bulb in this manner will have no affect on engine performance, and will not result in loss of priming action.

Sincerely,

JOHNSON MOTORS

Robert Compton
Administrative Assistant

RC:eb

NOTE: Post on your Miscellaneous index.

Historical service note

This bulletin documents the factory-approved relocation of the primer bulb. The fuel-flow arrow must point toward the motor, and hose clamps must be secured after reassembly.