No Fuel Spray
The heater has spark, the motor is
running, but no fuel is spraying. At this point you must determine if
the air pump is producing air. The principal: the pump sends air
to the nozzle, then through a hose to the nozzle adapter, then out the
nozzle. At the nozzle adapter a suction is created and fuel is sucked
from the tank and mixed with fuel at the nozzle and atomized.
- Using a low pressure gauge, check
the pressure. Instructions are on our
website. If after checking the pressure you find:
1. NO PRESSURE- disassemble the
pump (rotor). If the rotor is broken- replace. If the rotor chamber is
dirty - clean so the vanes will operate effectively. Re-assemble using
2. SOME PRESSURE- some
technicians will disassemble the pump first. We prefer to use soapy
water, first, to determine if there is an air leak. NOTE: a small
leak will cause big problems! An air leak is hard to see. Look for a
line of very fine lathery type foam. Check these spots:
- The point where the metal housing
joins the plastic end cover. There is a cork gasket attached to a
filter and many leaks start here.
- The plastic end cover itself. A
crack of any size will prevent the pump from reaching pressure.
If no leaks are found then disassemble
the pump. Clean or replace if needed.
3. If FACTORY SPECS are reached
but still no fuel present. The problem is between the
plastic end cover and the
nozzle -or- in the
fuel line. Check, using
- the condition of the airline
- the condition of the fuel line
- a leak in the nozzle adapter
- a restriction in the nozzle
- a restriction in the fuel filter.