DSG-423 FUEL SYSTEM
04-11
Preliminary Test
This Pinpoint Test checklist is your guide to the most probable causes of an engine performance complaint when
the malfunction is due to the fuel system.
Test Step Result Action to Take
1 Inspect installation. Yes
No
Go to Step 2..
Repair as necessary.
• Check fuel hose for kings.
• Check fuel hose lengths, orientation and presence of
parts.
Is everything OK?
2 Inspect Fuel System for Supply Leaks. Yes
No
Repair the leak.
Go to Step 3.
• Key OFF.
• Check for leaks or damaged supply lines from the fuel
tank to the fuel lockoff.
Are there any leaks present?
3 Inspect the Fuel System for any loose wires or
hoses.
Yes
No
Repair or Replace as Necessary.
Go to Step 4.
• Key OFF.
• Check the Fuel Lockoff connection and FCV valve
connection.
• Check the vacuum hoses to the FCV valve and
carburetor for any damage or leakage.
Is there any damaged or loose wires or vacuum hoses?
4 Check for fuel system leaks? Yes
No
Repair the Leak.
Go to Step 5.
• Key ON.
• Check the fuel system for leaks.
• Key OFF.
Are there any leaks present?
5 Check Carburetor air inlet for obstructions. Yes
No
Remove the obstruction, re-install the
aircleaner and attempt to start.
Proceed to appropriate
Troubleshooting Section.
• Remove the air cleaner.
Are there any obstructions in the air inlet of the
carburetor?
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