IDROBASE Stella - Page 69

69
FUEL PUMP
PROBLEM CAUSE SOLUTION
Low pressure
at the nozzle
• Motor-pump coupling not correct.
• Spring pressure regulator broken.
• Remove the pump, check if the joint is damaged. If ne-
cessary replace it.
• Loosen pressure regulator screw, check spring integrity. If
necessary, replace it.
Low ow rate
at the nozzle
• Water in the pump
• Fuel with additives or polluted.
• Nozzle lter dirty.
• Nozzle blocked.
• Solenoid valve blocked or dama-
ged.
• Pressure regulator piston dama-
ged.
• Pump body damaged.
• Undersized pump.
• Check that the pump is not sucking water from fuel tank
and that it is not already damaged.
• Change fuel in the tank.
• Remove nozzle and clean lter with compressed air.
• Remove nozzle and clean orice with compressed air. If
necessary, replace it.
• Loosen the screw that tightens the coil to the solenoid
by 14 mm hexagonal key; supply coil and make sure it
remains secured to the valve due to the magnetic force
present; cut-out the power from the coil and remove it
from its housing; loosen the sleeve and check that the
inner core can slide freely; assure that the fuel ow is not
blocked.
• Loosen pressure regulator screw, remove spring and pi-
ston inside the pump and then replace them
• Replace the pump.
• Check that the pressure and ow rate assured by the
pump are higher than that required. If is necessary place
the pump.
Unstable
pressure
• Air inltration in suction pipe.
• Solenoid valve blocked or dama-
ged.
• Water in the pump.
• Fuel with additives or polluted.
• Motor-pump coupling not correct.
• Partial block of lters or suction
pipe.
• Check that all connections are air-proof.
• Loosen the screw that tightens the coil to the solenoid
by 14 mm hexagonal key; supply coil and make sure it
remains secured to the valve due to the magnetic force
present; cut-out the power from the coil and remove it
from its housing; loosen the sleeve and check that the
inner core can slide freely; assure that the fuel ow is not
blocked.
• Check that the pump is not sucking water from fuel tank
and that it is not already damaged.
• Change fuel in the tank.
• Remove the pump, check if the joint is damaged. If ne-
cessary replace it.
• Check the cartridge lter inside the pump by loosen the
screw with 4 mm hexagonal spanner, also check other l-
ter inside the suction pipe.
10  TROUBLESHOOTING
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