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Fuel Injector Cleaning

EFI Injector Application Chart:





Fuel Injector Tester/Cleaner

The Fuel Injector Cleaner was designed to facilitate fuel injector servicing by testing and/or cleaning the injectors without removing them from the engine.

Test Fuel Injector Before Cleaning

1. Turn manual shutoff valve of test stand panel to OFF position.
2. Filter and pour clean gasoline into the tester fuel tank, and fill to lower fill line for 8 cylinder engines. Use less for 6 and 4 cylinder engines.

DO NOT USE CLEANER SOLVENT FOR TESTING

3. Connect power supply line to vehicle battery. Red light on cleaner side will flash indicating power connection has been made. (Unit is off)
4. Activate the 10 minute timer, check pressure gauge. The pressure gauge should read 38-40 psi. If an adjustment is necessary, turn shutoff valve to ON, reset regulator. (Remove black cap, back-off locknut, turn screw to obtain proper setting and retighten lock nut. Replace cap. Turn unit off.)
5. Connect fuel supply hose to outlet and place other end of hose back into tank. Actuate the 10 minute timer and turn flowmeter selection valve to flowmeter No. 1 then to flowmeter No. 2. Repeat this procedure several times to eliminate all air bubbles from the system. Turn unit off. Flowmeter selection valve must be in position No. 1 or No. 2 for unit to function properly. Reinstall fuel tank cap snugly and back-off one turn.
6. Disconnect engine fuel inlet connection at the fuel manifold (rail). Connect the supply hose from testing equipment to the fuel inlet connection.
7. Disconnect engine fuel return connection at the fuel manifold from fuel return. Plug the return line. Install the U-Tube (supplied) between the chassis supply line and the chassis return line.
8. Install the turnbuckle loosely between throttle control rod and suitable hook-up point on vehicle fender wall. Activate the 10 minute timer.

CAUTION: Be sure vehicle is in PARK or NEUTRAL, parking brake on and/or wheels blocked.

Start engine and check for leaks.

9. When the engine speed has stabilized, set the idle speed to 2000 rpm with the turnbuckle.
10. Run the remainder of the 10 minute cycle to eliminate all the air in fuel supply hose and fuel rail. When automatic timer shuts off, reactivate 10 minute timer and turn ignition switch to OFF position.
11. Select the proper flow range. Turn the flowmeter selection valve to No. 1 for Blue, Yellow, or Grey injectors, and No. 2 for Brown, Green, Black, or White injectors. The flow band colors correspond to the injector top color. See Application Chart
12. Install the tester injector harness on the injectors. Match the injector number on the harness to that of the cylinder.
13. Place injector selector switch to each injector number while pressing fuel injector test button.
14. Observe the position of the flowmeter float at eye level when the ball stops rising. A float level within the color code range on the scale indicates a good injector. Flow readings slightly higher than the flow band after cleaning are acceptable.
15. To confirm initial test readings, a maximum of three testings on the set of the injectors can be performed restarting the engine.
16. Any injectors removed from an engine should be bench tested to confirm diagnostic conclusions. A continuity checker is provided to check continuity of harness leads between the injector and the ECM unit. Disconnect injector and insert check into injector plug. Start engine. Observe. Check will blink showing completed circuit for that injector being tested.

NOTE:

a. If the flowmeter readings are high or low on the color scale, the injectors should be cleaned.
b. If the readings are high, there may be leaky injectors. Observe pressure gauge, it should hole pressure with the fuel pump off. If a pressure drop occurs, detect the leaky injector by observing flowmeter. A leaky injector shows less flow. If this is not possible, test injectors individually.

Fuel Injector Cleaning Instructions

1. Turn shutoff valve to On.
2. Filter and pour clean gasoline into tester fuel tank and fill to lower fill line for 8 cylinder engines. Use less for 6 and 4 cylinder engines. Add injector cleaner solvent until mixture reaches upper fill line. Mixture approximately 1 oz. cleaner solvent to 7 oz. unleaded gasoline per cylinder.
3. Connect power supply line to battery. Red light on cleaner side will flash indicating power connection has been made and unit is off.
4. Activate the 10 minute timer and check pressure gauge. The pressure gauge should read 38-40 psi. If adjustment is necessary, turn shutoff valve to ON, reset regulator. (Remove black cap, back-off locknut, turn screw to obtain proper setting and retighten locknut. Replace cap. Turn unit off.)
5. Connect fuel supply hose to outlet and place other end of hose into tank. Actuate the 10 minute timer and turn the flowmeter selector valve to flowmeter No. 1, then to No. 2 and back to No. 1. Repeat this procedure several times to eliminate air from the system. Turn flowmeter selector valve No. 2 for all cleaning applications. This allows maximum flow. Turn unit off.
6. Disconnect engine fuel inlet line at the supply manifold (rail). Connect the supply hose from cleaning equipment to the fuel inlet.
7. Disconnect engine return line at the supply manifold. Plug the return line. Install the U-Tube (supplied) between the chassis supply line and the chassis return line.
8. Install the turnbuckle loosely between throttle control rod and suitable hook-up point on vehicle fender wall. Activate the 10 minute timer.

CAUTION: Be sure vehicle is in PARK or NEUTRAL, parking brake on and/or wheels blocked.

Start engine and check for leaks.

9. When the engine speed has stabilized, set idle speed to 2000 rpm with the turnbuckle.
10. Reset the remaining 10 minute cycle. Turn ignition switch to OFF, remove turnbuckle.
11. Disconnect the cleaner supply hose from the fuel supply manifold connection inlet. Drain and discard remaining mixture from cleaner fuel tank.
12. Turn power switch off and disconnect power supply. Reinstall fuel lines. Start the engine and check for leaks. Use new fuel connector retaining clips when reinstalling vehicle fuel lines in 1983-85 models. Lubricate O-rings. Put safety ring onto fuel line connector when reinstalling vehicle fuel lines on late models equipped with spring lock connectors. Safety indicator ring will pop off when connection is properly installed. Check for proper seating of connection by using hand force to separate connection, check for leaks.


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