No
No
Does it turn off
,
but kicks ev
ery so
often?
Y
es
No
The pump might ha
ve
failed
Y
es
Bleed the pump: does it turn off when y
ou close
bleed v
alv
e?
The pump might ha
ve
turned into a "Gr
ade
C" and can't maintain
pressure. R
eplace
pump or switch to
other line
Y
es
Is there a leak somewhere?
No
Y
es
Is this a spr
ay
pump?
R
eplace whatev
er
is leaking
Explain to the customer the importance of bleeding the
pump
No
Is it pulling liquid?
No
Y
es
S
w
ap ZMAIN134
with a known
working one: Does
the pump stop?
R
eplace
ZMAIN134 Bypass
S
witch
Pump Continuously Running