Johnson Service Bulletin SB-939 - New Style Fuel Pump Hose

January 21, 1963. Johnson Motors introduced a strengthened crankcase-to-fuel-pump hose for V-50 and V-75 engines and specified the associated clamp and protective spring.

Johnson Motors Service Bulletin letterhead
January 21, 1963
Bulletin No. SB-939
Powerhead
SUBJECT: New Style Hose #309363 - Crankcase to Fuel Pump
         for all V-50 and V-75 Engines.

A redesigned hose of improved construction is presently being used on 75 h.p. engines to connect the fuel pump with the engine crankcase. This new hose has been strengthened by an internal lamination of rayon cords and will prevent hose rupture due to engine backfire.

Figure 1 - Crankcase to fuel pump hose with protective spring installed
Figure 1.

The new hose is easily identified by its smaller diameter and by the herring bone pattern on its exterior surface.

To install (on all V-50 and V-75 h.p. engines) order -

1- #309363Hose
2- #309523Clamp (required to accommodate smaller diameter hose).
1- #309740Spring

NOTE: #309740 spring must be installed over the hose, covering the sharp 180° bend near the fuel pump, to prevent it from collapsing in this area. See illustration in Figure 1.

All parts mentioned in this bulletin are now available from your Parts Distributor at the list price shown in the current Johnson Master Price List. Order only from your Parts Distributor - the standard parts discount applies.

Sincerely,

JOHNSON MOTORS

Robert Compton
Service Department

RC:eb

NOTE: Post on your V-50 and V-75 indexes.

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