Gasboy 552A Series - Manual (Page 25)

Maintenance and Troubleshooting
0124 5-5
TROUBLESHOOTING
Possible Cause
Checks Corrective Action
Failure of bypass valve causes
pump to stall completely Presence of foreign material in
pump may cause bypass valve
to become stuck in its seat or
valve cylinder. Condition may
develop when a pump has
been idle for some time; when
water is present; or when ice
has formed. Remove by-pass valve, clean
all parts, and reinstall the
valve.
Failure of regulating valve to
open prevents gasoline from
flowing to meter. Foreign matter may be lodged
in valve cylinder.
Insufficient pressure in supply
chamber due to break in
suction pipe, empty
underground storage tank,
clogged strainer screen, stuck
foot valve, needle valve,
extreme wear of parts or
excessive end play in rotary
pump head assembly, or ice
formation during cold weather,
if water is present in gasoline. Clean all parts and reinstall
valve.
Check list of possible causes
and perform appropriate
remedy.
Failure of regulating valve to
close. Valve may be held off its seat
by small particles of foreign
matter. Effect on normal pump
operation is not noticeable;
however, when the pump is
standing idle, even a slight
leak will permit gasoline to
drop down in the system. Remove regulating valve and
clean dirt from poppet and
seat; reinstall.
If cork disc of regulating valve
is badly pitted or worn, replace
it with a new regulating valve.
Failure of float needle valve to
open causes gasoline to be
discharged from air vent tube. May be caused by float being
clogged with gasoline, or by
corrosion of small pins (float
lever and valve pin) of needle
valve mechanism.
Float may be filled with product
caused by leak or puncture in
float. Replace a damaged float with
a new one. Clean or replace
corroded parts.
Replace with new float
assembly.