EFI Engine Fuel Pressure Tester with Flow Meter
Contents
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3. the engine and let it warm up until the coolant temperature sensor CTS reading is at least 85 C 185 F or until the cooling fan turns on at least once Connect the pressure gauge with the adaptor V E201 to the backpressure tap and take the backpressure reading at 2500 rom as quickly as possible If it is too long the adapter V E201 will be damaged by the heat Generally backpressure should not exceed 2 0 psi Most vehicles in good condition will operate with exhaust backpressure from 0 5 to 1 5 psi Many technacians feel that backpressure above 1 5psi may cause problems 5 4 If exhaust backpressure is the potential problem for a no start condition perform the backpressure test while cranking In some cases it may be possible to get an engine started after removing the O2 sensor or air injection check valve to relieve backpressure lf the backpressure test indecates a restricted exhaust check the following areas eA restricted muffler eA restricted catalytic converter eA collapsed or bent exhaust pipe elf tests indicate the converter is restricted and should be replaced determine the cause of the failure to advoid future converter damage Also check eUse of leaded gasoline eProlonged operation due to fuel system control problems or misfiring spark plugs elmproper operation of the air injection system eHigh oil consumption due to mechanical wear 6 The vacuum in intake manifold test Engine problems can influe
4. the pressure does not rise as vacuum line is disconnected connect a vacuum gauge or hand vacuum pump with gauge to the disconnected hose and start the engine and let it idle Check the vacuum gauge reading a If vacuum shows reconnect the vacuum hose to the regulator Wrap a shop cloth around the fuel return hose and lightly pinch off the hose then the pressure should rise if not the fuel pump may be defective if dose the regulator may be defective b If no vacuum shows inspect pressure regulator vacuum lines for improper routing loose connection and damaged or deterioration Replace it as required If the hose is good check the cutoff solenoid if the engine has or for an engine problem Some engine fuel pressure regulator is controled by a cut off solenoid valve at coolant temperatures above about 211 F 105 C or intake air temperatures above about 1 70F 80 C Disconnect the vacuum hose at the pressure regulater Connect a vacuum gauge or hand vacuum pump with gauge to the disconnect hose Start the engine and warm it to normal operating temperature electric cooling fan on Intake air temperature must exceed about 176 F 80 C Check the vacuum gauge reading If vacuum shows test the pressure regulater cutoff solenoid valve as described in the vehicle service manuals 1 4 Start the engine and let it idle generally the fuel flow should read 1 0 2 0 liter Min If the flow reading is under 0 6 liter Min the fuel volume output
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6. EFI Engine Fuel Pressure fuel pressure 800 FUEL PRESSURE D EA PRETU PPY080 M LETETI PI Dnran nanda ninin R OD QI _ IILI 2 PUEL FLOW EFI INDUSTRIAL EQUPMENT FOR ENGINE SYSTEM Tester with Flow Meter User s manual vacuum pressure 4 Ke 20 Acar VC INCH ed Bilg SR 100 eps 60 VACLUM PRESSURE MANIF OLD EXHAUST FINER EF INDUSTRIAL EQUIPMENT FOR ENGINE For morden vehicles with electronic fuel injection system accurate control of fuel pressure and flow is must When the pressure or flow does not meet OEM requirements the performance of the engine will be affected This may lead to difficulties in starting or excessive fuel comsumption To keep the engine in smooth working condition and to prevent unnecessary replacement of parts constant testing of engine system is highly advisable It is also necessary to inspect engine fuel system in order to get rid of all the potential problems The EFI Fuel System Tester can test the intake air vacuum and the exhaust backpressure Features 1 Fuel pressure test 2 Fuel flow test 3 Engine intake manifold vacuum test 4 Backpressure in exhaust manifold test 5 Various connectors to fit various vehicle models Specifications 1 Range of fuel pressure 0 800Kpa 2 Range of fuel flow 0 5 3L Min 3 Range of engine vacuum 100 0Kpa 4 Range of backpressure 0 60Kpa 5 Weight 3 3Kg 6 Dimensions 400mmx315mmx95mm Operation proced
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8. acuum hose at the pressure regulator Connect a vacuum gauge or hand pump with gauge to the disconnected hose 2 3 Start the engine and let it idle Check the vacuum gauge reading a If vacuum shows continue testing b If no vacuum shows test the pressure regulator cutoff solenoid valve as described in the vehicle service manuals 2 4 Remove the vacuum gauge or pump gauge and reconnected the vacuum line to the pressure regulator 2 5 Check the pressure gauge fuel pressure should be about 43psi 300kpa Bear in mind the pressure readings are different from various vehicle models User should refer to OEM requirements as described in the vehicle service manuals 2 6 Disconnect the vacuum hose at the regulator fuel pressure should rise about 4 to 6 psi from the regulated reading as vacuum hose is disconnected 2 f pressure does not rise in step 6 wrap a shop cloth around the fuel return hose and lightly pinch off the hose while doing this watch the pressure gauge reading the pressure should rise if it does rise the pressure regulator may be defective if it does not rise the fuel pump may be defective CAUTION When pinch off the fuel return hose do not allow the pressure rise too high such as 100psi 700kpa or the gauge and the fuel hose will be damaged 3 Fuel Static Pressure Test Start the engine and let it idle for 2 to 3 minutes then turn the engine off and check the pressure after 10 minutes Fuel pressure should
9. from the pump is insufficient Potential problems might be lack of power rough running engine surges or any fuel pressure regulated problems and so on If the fuel flow is too low the fuel filter pump inlet filter or the pump may be defective Wrap a shop cloth around the fuel return hose and lightly pinch off the hose the fuel pressure should rise about 15psi 100kpa if it dose rise the filter or the pump inlet filter may be restricted if it does not rise the fuel pump may be defective For example some vehicles such as TOYOTA CAMRY there is no regulator at the delivery pipe In order to check the fuel volume output from the pump disconnect the intake fuel pipe and connect the pressure flow gauge then put the outlet hose of the gauge in a keg Connect the fuel pump relay with a short wire to run the full pump Punch the outlet hose of the gauge gradually with the fuel pliers while watching the pressure gauge reading The pressure should rise to the station below normal about 0 5 psi then keep it steady and keep reading the flow meter The fuel volume should meet requirements 2 Fuel Pressure Regulator Test For some engines vacuum to the pressure regulator is controlled by a cutoff solenoid valve at coolant temperatures above about 221 F 105 C or intake air temperature above about 176 F 80 C 2 1 Inspect pressure regulator vacuum lines for improper routing loose connections and damage or deterioration 2 2 Disconnect the v
10. ilter epolluted gasoline in hot condition Connect the pressure flow gauge and start the engine watch the pressure and flow if they are surging quickly there may be air in the system Stop the engine disconnect the fuel pump fuse or the fuel pump relay then restart the engine again keep watching the flow meter There may be balls of air become bigger as fuel pressure drops While doing this pay attention if the gasoline is dirty and if there are drops of water in the gesoline 5 Exhaust system backpressure test for restricted exhaust or catalytic SME converter The exhaust oxygen O2 sensor can be removed from the manifold on most engines for access to the exhaust system for testing On some engines the sheet metal heat shield must be removed for easy access to the sensor On some engines it may be easier to test exhaust backpressure by removing the EGR valve Be sure to plug the EGR inlet to the intake manifold during testing NOTE During removal access to the O2 sensor may be difficult on some vehicles If the engine has air injection you may be able to remove the air injection check valve or tube and connect the pressure gauge in this location Be careful not to damage the check valve CAUTION Remove the exhaust oxygen O2 sensor carefully to avoid damaging the threads on the sensor or in the manifold Remove the O2 sensor or the EGR valve and install the backpressure tap E301 into the manifold 0 2 9 0 Start
11. nce the vacuum in intake manifold So we can find many engine problems by inspecting the vacuum in intake manifold Connect the vacuum pressure gauge with adapter V201 to a suitable vacuum hose to intake manifold Start the engine and let it idle Generally the gauge reading will stay at about 17 to 21 psi Various engine problems can be found in previous two pages 7 Finish inspection When inspection finished hang the pressure flow gauge up and put the hose of the gauge in a container so that the remaining fuel will flow out then clean it with a clean shop cloth For maintenance it is necessary to keep the o rings clean and apply a light coat of oil to it before use Below chart explains how to use the adapters F101 F102 F105 S yo are A eP r F102 F105 Disconnect the bolt from fuel filter or from delivery pipe Choose a suitable adapter among F102 F105 install the adapter without sealing washers to the filter or the delivery pipe with the bolt disconnected the torque should be smaller otherwise the adapter will damaged Afterwards connect the adapter of the other side to the adapter of the pressure flow gauge the fuel flow direction should respond to the pressure flow gauge Connect the fuel pipe to F101 then connect F101 to the other side of the pressure flow gauge connector the fuel direction should respond to the gauge E301 V E201 V201 Packing List amp Accessories A G y jee ae F1
12. ures 1 Fuel system pressure and volume test CAUTION Do not smoke or work near an open flame when working on fuel system inspection Observe fuel system safety precautions when connecting and disconnecting the pressure gauge lt is advisable to disconnect the battery ground before opening any fuel system fitting Then reconnect the cable to run the engine for testing Use this pressure flow gauge to test fuel system it is unnecessary to road test vehicle when it is necessary to test fuel volume outout We can check the volume output by the pressure flow gauge while the engine idle 1 1 Remove the gas cap to relieve air pressure in the fuel tank Then relieve fuel system pressure at the station between the fuel input line and the fuel distribution pipe where we are going to connect the gauge Connect the opressure flow gauge with a suitable fuel pressure test adapter 1 2 Start the engine and let it idle pay attention to the pressure gauge and the fuel flow meter Generally fuel pressure should read about 43psi S00kpa 2 and the fuel flow should read 2 liter Min However the pressure and the flow readings are still different from various vehicle models User should refer to OEM requirements from the vehicle service manuals 1 3 Disconnect the vacuum line at the pressure regulator and then plug the vacuum hose Fuel pressure should rise as vacuum line is disconnected Generally the pressure should rise 4 to 6 psi from the regulated reading If
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