Flame heater fuel pump electrical system is negatively
g r o u n d e d . P i n A is positive and pin B is negative. Do
n o t switch polarity of pump during checking or replace-
m e n t . C h a n g i n g polarity will permanently damage pump.
Hook up 2 4 - v o l t battery (1) with rheostat (2) to fuel pump receptacle (3).
Hook up v o l t m e t e r (4) to fuel pump receptacle (3).
GO TO FRAME 3