Manuals through 2025 now available!
Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.
LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
lemon-manuals.la or
lemon-manuals.org.ua
(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)
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Oil Pressure Sensor: Description and Operation
Purpose: As a back-up system to the fuel pump relay, the fuel pump is also turned ON by the
oil pressure switch.
Operation: When the engine oil pressure reaches about 28 kPa (4 psi), through cranking the
oil pressure switch will close to complete the circuit to the fuel pump.