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INSTRUCTIONS FOR USE
The low pressure circuit basically comprises the following: fuel tank, fuel pump, filter, pressure regulator and
pipes.
How can the low pressure circuit be tested?
Checking the low pressure circuit is relatively easy; the fuel pressure should be checked at certain points of the
system.
What can you check with this tester exactly?
You can check the whole low pressure circuit, which includes the fuel pump, fuel filter, pressure regulator and
piping system.
How can the low pressure circuit be tested?
The low pressure circuit test is a three step test.
Test n°. 1
Description: pressure test at high pressure pump inlet. Correct value: 2.5 bar.
Results of test n°. 1:
– Correct pressure: 2.5 bar. Go to test n°. 2
– Significantly higher pressure: faulty regulator
– Significantly lower pressure: go to test n°. 2
Test n°. 2
Description: pressure between low pressure pump and filter.
Correct value: 2.5 bar.
Results of test n°. 2:
Correct pressure: 2.5 bar. Go to test n°. 3
– Significantly higher pressure (test n°. 1 was correct): dirty filter. Replace filter cartridge.
– Significantly lower pressure (in test n°. 1 it was also significantly lower):
– Turn off tap:
1) Pressure is 2.5 bar or higher: faulty regulator
2) Pressure is too low: faulty low pressure pump.
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