Operation CHARM: Car repair manuals for everyone.
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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Fuel Pressure




Fuel Delivery Rate, Checking


Fuel Delivery Rate Chart:






- Compare quantity of fuel delivered with chart.
*) Minimum delivery cm3/30 seconds
**) Voltage at fuel pump with engine not running and pump activated (approx. 2 Volts less than battery voltage).

Example:
During test a voltage of 12.5 Volts is measured at the battery. As the voltage at the fuel pump is approx. 2 Volts less than battery voltage then this will equate to a minimum delivery of 200 cm3/30 s.