No Start Test 9 - Fuel Pump Pressure Check
- Connect fuel pump pressure gauge to fuel line at carburetor. Plug fuel return line at fuel filter. Crank engine for at least 10 seconds. Fuel pump pressure should be at least 2-5 psi.
- If fuel pump pressure is okay, repair carburetor fuel inlet circuit. If fuel pressure is not within specifications, reconnect fuel line at carburetor. Connect fuel pump pressure gauge to fuel line before fuel filter. Crank engine for at least 5 seconds.
- Fuel pump pressure should be at least 2-6 psi. If fuel pressure is okay, replace fuel filter. If fuel pressure is not within specifications, disconnect pressure gauge. Disconnect fuel pump inlet line and connect a vacuum gauge to pump inlet. Crank engine for at least 10 seconds.
- Vacuum gauge should read at least 10 in. Hg vacuum. If vacuum is not within specifications, replace fuel pump. If vacuum is okay, check for restricted or plugged fuel lines, fuel tank vent or in-tank filter.