- Disconnect the fuel inlet line going to the carburetor. Install a calibrated
pressure gauge into the line coming from the pump. Be careful not to spill
any fuel, but if you do, remove all spillage before starting the engine.
- Start the engine and run it at idle using the fuel still in the carburetor
float bowl. Allow the engine to run until the pressure gauge reaches a maximum
reading. Note the pressure reading. Normal specifications are 2.84–3.84
psi (20–26 kPa), except for the 323, whose specifications are 3.98–4.98
psi (27.4–34.3 kPa) for the Sedan or 3.91–4.93 psi (27–34
kPa) for the Wagon.
- Stop the engine. Remove the pressure gauge, reinstall the fuel line into
the carburetor, and run the engine until the carburetor float bowl is full
of fuel.
- To test the volume of fuel discharged by the pump, the engine must be run
at idle for one minute. Position a durable container (preferably metal) with
a capacity of at least 1 1⁄2 qts.
near the carburetor fuel inlet line. Disconnect the fuel line at the carburetor,
and put the open end into the container. Idle the engine until it stops (or
for one minute) and time how long it has run. Then, reconnect the fuel line
to the carburetor and run the starter or idle the engine until the float bowl
is full. Repeat the fuel discharge and timing operation until the engine has
run for a total of one full minute at idle speed and all the fuel discharged
by the pump has been collected. The pump must discharge at least 1.1 qts.
per minute.
- The pump should be replaced if it fails either the pressure or volume test.