Issue Date:  April 27, 2006

Revision Date:  May 23, 2011

L & J Engineering, Inc.

MCG 1100/MCG 8100 
(Magnetostrictive Probe)



Leak rate of 0.2 gph with PD = 99.5% and PFA < 0.5%.

Leak Threshold

0.1 gph for leak rate of 0.2 gph.
A tank system should not be declared tight if the test result indicates a loss or gain which equals or exceeds the applicable threshold.


Gasoline, diesel, aviation fuel, fuel oil #4.

Tank Capacity

Maximum of 15,000 gallons.
Tank must be between 50 and 95% full.

Waiting Time

Minimum of 4 hours between delivery and testing.

Test Period

Minimum of 5 hours.
Test data are acquired by and recorded by system’s computer.
There must be no dispensing or delivery during test.


Average for product is determined by a minimum of 5 resistance temperature detectors (RTD’s).
Sensors located above the liquid level are electronically removed from the data analysis.

Water Sensor

Must be used to detect water ingress.
Minimum detectable water level in the tank is 1.1 inches.
Minimum detectable water level change is 0.015 inch.


RTDs and probe must be checked and, if necessary, calibrated in accordance with manufacturer’s instructions.


Not evaluated using manifolded tank systems. Therefore, this certification is only applicable when there is a probe used in each tank and the siphon is broken during testing.
Tests only portion of tank containing product.
As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure).
Consistent testing at low levels could allow a leak to remain undetected.
EPA leak detection regulations require testing of the portion of the tank which routinely contains product.


L & J Engineering

Evaluator:  Ken Wilcox Associates

5911 Butterfield Road

Tel:  (816) 443-2494

Hillside, IL 60162

Date of Evaluation:  09/01/92

Tel: (708) 236-6000


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