Johnson Service Bulletin SB-935 - Accessory Fuel Pump Kit

January 14, 1963. Johnson introduced accessory fuel pump kit 379027 for its 1963 3 H.P. outboards, allowing operation from a remote six-gallon fuel tank instead of the integral tank.

Johnson Motors Service Bulletin
January 14, 1963
Bulletin No. SB-935 Accessory
SUBJECT: Accessory FUEL PUMP KIT, Part 379027, for all 1963 - 3 H.P. Engines.
An accessory FUEL PUMP KIT is now available for installation on all 1963 - 3 h.p. engines. This kit permits operation of this engine from the current six gallon (non- pressurized) fuel tank - to give the engine an extended period of operation on one gas tank filling.
This accessory should appeal to the fisherman, since it extends the full throttle operation time from approximately one hour with the integral fuel tank to as much as 12 hours from a full six gallon tank - more than adequate for a complete days outing. Further, running the engine at reduced power can give up to 17 hours continuous operation.
Figure 1 - exploded view of Johnson accessory fuel pump kit 379027
FIGURE 1
The FUEL PUMP KIT is not adaptable to pre- 1963 engines since these engines lack the necessary tap holes and passage into the crankcase required to accommodate install- ation and operation of a fuel pump. Also - once the accessory FUEL PUMP KIT is installed on a 3 h.p. engine according to instruction, the engine can only be operated from the six gallon fuel tank. A pipe plug, item 1, Figure 1, is furnished with the kit and is used to block off the fuel outlet of the integral fuel tank when the kit is installed. This naturally disconnects the integral tank from the fuel system. The FUEL PUMP KIT may be removed and the engine returned to normal configuration at any time.
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SB-935 Page 2
Pre-1963 and 1963 crankcase photographs, with arrows marking fuel pump mounting points
Old Style (Pre-1963)
New Style (1963) with provision for fuel pump installation and operation.
Step by step installation instructions are furnished with the kit. Installation is quite simple and should require approximately 1/2 to 3/4 of an hour.
Once the engine is converted to fuel pump operation, the owner will continue to mix fuel and oil at the standard 24:1 ratio, or six gallons of gas to one quart of oil.
Part 379027 FUEL PUMP KIT sells for $8.00 list. Your dealer accessory discount applies to the purchase of this part which must be ordered from your Parts Distributor.
JOHNSON MOTORS Robert Compton Service Department
RC:eb
NOTE: Post on your 3 h.p. index.

Technical reference

Johnson part 379027: Accessory fuel pump kit for 1963 3 H.P. engines. The bulletin states that the kit is not adaptable to pre-1963 engines and gives an original list price of $8.00.