BF135A•BF150A
5-106
• Pressure Regulator Inspection
• If the fuel pressure is lower than the specified standard pres-
sure, check the high pressure side fuel pump (P. 5-107), then
check the pressure regulator.
1) Check that the pressure regulator control tube is not bent,
disconnected and damaged.
2) Remove the service check bolt. Set the special tool (fuel
pressure gauge set) in the threaded bolt hole.
3) Remove the propeller. Set the gear case in a test tank filled
with water and start the engine.
4) With the engine idling, disconnect the pressure regulator
control tube from the pressure regulator and clamp it.
5) Check the fuel pressure. It should be higher than the pres-
sure measured with the vacuum tube connected.
6) When the fuel pressure does not rise, connect the vacuum
tube to the pressure regulator. Pinch the pressure regula-
tor return hose that goes from the pressure regulator to the
vapor separator a couple of times lightly, and measure the
fuel pressure again.
Protect the pressure regulator return hose by winding a
shop towel or equivalent material around the hose, and
lightly pinch the hose with the pliers.
7) If the measurement is outside the specified standard pres-
sure, replace the pressure regulator (P. 5-136).
NOTICE
Gasoline is highly flammable and explosive.
You can be burned or seriously injured when handling fuel.
• Keep heat, sparks, and flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
SHOP
TOWEL
PRESSURE REGULATOR
RETURN HOSE
PLIERS
FUEL PRESSURE GAUGE
SET 07406-0040002
TUBE CLAMP
(Commercially available)
PRESSURE REGULATOR
CONTROL TUBE
PRESSURE REGULATOR
Standard fuel pressure
270 – 320 kPa
(At idle speed of
(2.8 – 3.3 kgf/cm
2
,
650 ± 50 min
-1
/rpm)
40 – 47 psi)
