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Tools

Diesel Fuel Return Flow Tester

With the continued growth of diesel vehicles in recent years, maintenance and understanding of these systems is obviously becoming more and more important in the automotive industry.

 

To account for this growth in diesel fuel, Laser tools have recently introduced a number of diesel technology based tools - part number 5260 is a Fuel Return Flow Tester suitable for both common rail and conventional diesel engines. Pressure loss on a common rail fuel system can often result in poor or no engine starting, rough running and poor acceleration. A common reason for pressure loss is excessive fuel being returned to the fuel tank (also referred to as ‘back leakage’). If the injector(s) suffer from excessive back leakage, the fuel pump cannot generate enough pressure to let the system operate correctly. This can be more obvious at start and tickover as fuel pressure is directly related to engine revolutions.

The Laser kit is comprehensive and usefully can cater for up to ten injectors in one test. Forty adaptors are included for Bosch, Siemens, Denso and Delphi CRD systems.

The fitting and testing procedure is relatively straightforward:

Step 1

Remove the return pipe connectors from the top of the injector (usually secured by a wire clip).  Hang the bottle assembly in a suitable position under the bonnet. Choose the correct connectors from the kit and fit the flexible pipes to the injectors.

Step 2

Start the engine and leave to tickover. Watch the bottles and stop the engine when they are approximately 75% full.

Step 3

Compare the levels across the bottle assembly. A bottle showing more than 10% extra fuel, points to an injector that may have a leakage problem as it is returning more fuel back to the tank.

 

 

For any technical queries relating to this product contact Laser technical support on 01926 818181

 

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