Fuel Pressure: Testing and Inspection

STEP 1 FUEL PRESSURE CHECK
^ Install fuel pressure gauge at the carburetor.
^ Reconnect fuel line.
^ Start engine at 1500 rpm for 30 seconds.
^ With engine at idle, read the fuel pressure gauge.
NOTE: If the engine does not start, read the fuel pressure gauge after cranking the engine for 10 seconds.
^ Is the fuel pressure 6.0-8.0 psi?
YES - Go to STEP 2
NO - Go to STEP 3



STEP 2 FUEL VOLUME CHECK
^ Disconnect primary side of ignition coil.
^ Disconnect fuel line at carburetor.
^ Slide a flexible fuel resistant hose onto the disconnected fuel line and hold it into a clear plastic fuel resistant container.
^ Verify smallest diameter in the fuel line is greater than 0.22 inch.
^ Crank the engine using a remote starter.
^ Is the volume 0.3 pint in 10 seconds?
^ Save the fuel in container for STEP 5
YES - Replace fuel filter and/or service carburetor. Reconnect the ignition coil.
NO - Go to STEP 5


STEP 3 CHECK USING AN AUXILIARY FUEL SUPPLY
^ Use an auxiliary fuel supply and route the flexible fuel line under the fender or bumper to the inlet side of the fuel pump.
^ Repeat test STEP 1 & 2
^ Is the fuel pressure at least 6.0 psi and fuel volume 0.3 pint in 10 seconds?
YES - Reconnect the fuel pump line at the fuel pump. Go to STEP 4
NO - Replace the fuel pump and fuel hose.


STEP 4 FUEL LINE CHECK
^ Disconnect the fuel line at the tank.
^ Connect auxiliary fuel supply to the fuel line.
^ Repeat STEPS 1 & 2
^ Is the fuel pressure at least 6.0 psi and fuel volume 0.3 pint in 10 seconds?
YES - Go to STEP 5
NO - Blow out/service fuel line. Replace flexible hoses.

STEP 5 FUEL CONTAMINATION CHECK
^ Check remaining fuel in the tank for contamination.
^ Check the fuel sample for contamination.
^ Is the fuel contaminated?
YES - Dump and flush the fuel tank. Blow out the lines and replace the filter. Clean out the carburetor.
NO - Fuel Delivery System is OK.