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(4)
With the throttle body installed on the engine:
Carefully remove fuel pump pulse line from throttle body pulse pump fitting
Do not damage throttle body when removing the pulse hose
.
Check for excessive oil in the fuel pump pulse hose If excessive oil is found, allow oil to
drain from the pulse line and spray a small amount of carburetor cleaner into the pulse
nipple on the fuel pump
.
After using the carburetor cleaner, blow low air pressure across the pulse nipple to draw out
any oil or carburetor cleaner
.
DO NOT blow air directly into fuel pump or damage to the throttle body will occur
Re-assemble pulse line and re-check engine performance
5-4-3 INSPECT FILTERS AND TANK LINES
(1) Check the air filter Replace as needed
(2)
Inspect the fuel feed pipe for any restriction or damage
Replace as needed
(3)
Check the fuel tank outlet filter as well Replace as needed
(6) Inspect the fuel return pipe for any restriction or damage.
Replace as needed .
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5-4-1 CHECK CRANKCASE OIL LEVEL AND FOLLOW STARTING PROCEDURE
(1) Check the oil level and add or drain oil until to the proper crankcase level.
Low oil or overfilled crankcase oil can cause fuel pump malfunction due to low crankcase
vacuum or a pump restriction due to oil carry over into the pump.
(2) Turn the ignition switch to off, pull 5 or 6 times, then turn switch back to on and start engine
normally.
Following this extra starting procedure on an EFI engine will ensure the cylinder is not
flooded and/or ensure the fuel system has been purged of excess air.
(3) Inspect EFI wire harness for damage. Inspect harness yellow wire with engine temperature
senor closely for damage.
A broken temperature sensor can cause erratic engine performance.
Replace harness as a complete assembly as needed.
(4) While still installed on the engine, inspect throttle body assembly for major damage.
Replace as needed.
5-4-2 INSPECT FUEL PUMP PULSE LINE
(1) Inspect the fuel pump pulse line for any restriction, air leaks or damage Replace as
needed
.
(2) Inspect fuel pump cover on the bottom of the throttle body for cracks or damage. Pay close
attention in the pulse fitting area for cracks.
(3) Inspect throttle body pulse fitting. If throttle body pulse side fitting is loose, repair with green
wicking grade Loctite #290 between fitting and pump cover.
(4) Inspect small fuel pump foam filter. Clean or replace as needed.
(5) Inspect fuel injector pressure port cap. If damaged, replace.
(7) Check fuel pump reducer breather hole below throttle body fuel inlet fitting for liquid. If reducer hole
has liquid exiting hole when engine is pulled over or running, replace fuel pump diaphragm assembl
y.