1. Remove fuel pump supply line.
1. Fuel line
2. Sleeve seal
3. Clear plastic tube
4. Clamp
2. Make a test fuel line.
• Use spare fuel line. (Make sure the sleeve seal is in good condition.) Cut the line in half. Use the test fuel line portion that supplies the fuel pump. Install clear plastic line in place of removed section and secure plastic line with
a clamp.
NOTE: The mechanic is expected to keep the fuel test line for future diagnostics. Expense the fuel test line as an essential tool and keep it with other diagnostic tools. Warranty will not cover the cost of the fuel test line.
3. Connect the fuel test line between the fuel pump inlet and an alternate fuel source.
4. Start or crank the engine for 20 seconds. Measure fuel pressure with the shut-off valve closed. Open
the shut-off valve to check for aeration.
NOTE: Breaking any fuel system joint will induce air into the fuel system. The air should pass in a short period of time. As fuel pressure is relieved, a steady stream of fuel without air bubbles indicates the fuel is not aerated.
• If the fuel is aerated, go to “Combustion Leaks to Fuel” (page 108) in this section.
• If the fuel is not aerated, remove test setup from the fuel pump inlet. Connect the fuel pump supply line. Go to “Alternate Fuel Source Supply to Fuel Filter Housing” in this section.
