Measurement Of Fuel Pressure - TOHATSU MFS 25D Service Manual

Fuel System (Fuel Injection)

5) Measurement of Fuel Pressure

Remove the cap 1.
1.
Connect the pressure gauge 2 as shown in the figure.
2.
• Before measurement, check that the
pressure relief valve is fully closed.
• Before connecting the pressure gauge,
c o v e r t h e c o n n e c t i o n b e t w e e n t h e
pressure gauge and valve with a clean
and dry cloth to prevent fuel from leaking.
• Connect the pressure gauge securely.
Pressure Gauge Assembly:
P/N. 3T5-72880-0
3. Start the engine, run it for 5 minutes to warm up, and
then measure the fuel pressure. If the pressure is below
specified value, check high pressure fuel passage and
vapor separator.
• Before measurement, be sure to check
that the pressure relief valve is fully
closed.
• Do not open the pressure relief valve
during measurement. Opening the valve
allows fuel to spew out, possibly causing
fire.
• After measurement, cover hose tip with
rag, and open pressure relief valve to
drain fuel from discharge hose and the
instrument.
• Before storing pressure gauge, fully close
pressure relief valve.
Fuel Pressure (Reference value):
250± 5 kPa
(35.5 ±0.724 psi) [2.5 ±0.05 kg/
• To measure the fuel pressure without operating
the engine on a basic tiller handle model
(manual start model), remove the lock plate of
the engine stop switch and pull the recoil starter
4 to 5 times to measure the fuel pressure.
• Turn the key switch to ON (3 seconds operation)
to measure the fuel pressure without running the
engine on a multi-function tiller handle model or
remote control model.
4-34
WARNING
WARNING
cm ] (at 10 L/h)
2
4st 25/30 2022