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TM 9-8000
Figure 4-10. Mechanical Positive Pump Installation.
rocker arm as the fuel pump and is a nonpositive type
f. Electric, Bellows-Type (Fig. 4-12). The
diaphragm pump. At times when manifold vacuum alone
bellows-type electric fuel pump works basically the same
is sufficient to operate the windshield wipers, the
as  the  nonpositive-type  mechanical  pump.  The
diaphragm will be held up against the diaphragm spring
difference is that it is driven by an electric solenoid rather
by  atmospheric  pressure,  rendering  the  pump
than a mechanical cam-shaft. Operation is as follows:
Figure 4-11. Double Action Pump.


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