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Field inspection manual—volumetric measuring devices

Part 3, section 14—Performance—backlash test


This test is performed on dispensers and refuellers only.


Quick repetitive starting and stopping of product flow is a normal procedure in topping up a vehicle's fuel tank. This test determines if excessive backlash in the system will affect the delivered volume of product.

Legislative references

SVM.1-35, SVM.1-20, R.265.


Run a fast flow test and determine the accuracy of the meter.

Repeat the fast flow test, stopping and starting the product flow quickly, approximately five times.

Interpretation of results

The second delivery must not be outside the limits of error.


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