VP 44 pumps ~ REPAIRS This text write in order to help in practical work vp 4 stations. I rly on experience and is intended for beginners masters. In previous work we met with failures of pumps that globally can be divided into three groups 1 Failures electronics pumps that take 60-70% of all failures 2 Failures mechanical pump which consumes about 25% of total failures 3 Leaks ie faults in the sealing of the pump which consumes about 15% of total ures electronics failure Failures electronics We note the diagnostic device. mostly it isa mistake "Fuel valve" refers to the upper valve is located between the Pipe nozzles. This pump have not fuelt and the car will not start. On the workbench, the pump response. Correctly adjust start injection show temperature and RPM , but not have injection on injectors. The fault is MOSFET transistor driver valve to adj. futel. Transistor can replace, use the transistor IRLR2905 or better IRLR 3110 see next picture Electronics repair pumps 5 Replacing MOSPET transistor (driver valve for adj. fuel)‘You must use IRLR 2905 or 3110. Not use IRFZ 44 Another defect that we can answer in practice is an error in the CAN communication . Communication is broken and pump not respond wih test bench. All is same as pump not present. Usually damaged Mosfet Transistor causes and this damage... The fault is 5V voltage regulator that can successfully replace. We use a stabilizer 7805 or better 78S05 Replacement stabilizer3. defect when Car diagnostic not the correctness of speed sensor on the test bench, the pump response can adjust the amount and angle. When you rotate the pump it displays the temperature does not show the speed and not have injection. If the pump is on the car, the car will not start. Error is sensor of position rotor (RPM sensor). Same symptom may have and lost capatitor (lost solder not have good contact) Usualy when capatitor is lost pump work correctly few minutes.picture NECESSARY TOOL FOR REPAIR ELECTRIC PUMPS 1 table pounding that increases 3~4 times 2 soldering iron with temperature control 3 quality tweezers 4 standard tool pliers MATERIALS NEEDED FOR REPAIR ELECTRIC PUMPS: 1 MOSFET Transistor IRLR 2905 or 3110 ILRL both smd 2 voltage regulator SV 7805 or 78805 - TO220 3 Solder wires Imm 4 Liquid flux - the means to act coagulation (for better soldering) 5 mica insulators for housing T0220 (good dielecttic ) 6 Silicone pasta (for better cool DAMAGE MECHANICS OF PUMPS Mechanical failures can be very diverse, but in practice usually have same defect. When car start, and have smoke is usually white smoke Diagnostic device errors oceur "start injection," with Car diagnostic reads the parameters angle of start injection not good Error repair following order. Visual inspection, measurement of pressure, angle of injection test. Repairing or replacing is not the correct part At the end of the test on work bench of the angle of injection DESCRIPTION Pump cleaned and put on workbench. Cut one wire from the bottom valve, adjust the amount of fuel at around 2500, and turn the pump on the 100 RPM first and y increasethe speed to 400 RPM Stroboscope follow the angle of the pump to around 100 Nominal angle is zero and gradually inereases to 12 -16 degrees. If we have not, described this result we confirmed the foult, Next a test is a test which transfers the pressure to be 9 bars min at 400 rpm If he's wrong mistake in the fuel supply or transver pump (usually it’s all ok) In the next measurement is wecessary to remove the bottom valve (for start injection), and in its place transver measured pressure at 400 rpm must be 9-18 bar .. if you do not have that kind of pressure fault in the pump housing so. Small nozzle repair Drill hole 4mm on place (ode busiti) and use long needle for remove nozzle If the pressure is OK must inspection of stop valve look pitureUsuali damage bootom rubber on picture brown, And next inspection is clip look next pictureRepair damage polishing Inspection andIf Hole of clip not good usually can repair this polishing Tools Requized 1 Diesel stroboscope 2 baromettic instrument measuring pressure transver 3 tools for outbreak clip 4 tool for extracting bearings 5 standard tool for disassembly MATERIALS NEEDED 1 Set for sealing pumps 2 clip with carabiner clip (mostly successfully improves processing) Conelusion: if you have all the necessary tools with a little practice and accuracy is not a problem to fix the mechanies of the pump DAMAGE sealing PUMPS Failures sealing pumps mainly occurs during the winter Car will not start in the morning. When is start engine work all day Usually damage serews (bolts) to block the pump (rubber), rubber electronic pump (located under electronics) Date: 22.03.2013 Nikola Bogdan, Autoelektronika Sombor web: www.autoelektronika .co.1s