How to Check for Fuel Delivery in a Geo Metroby ContributorUpdated November 07, 2017
How to Check for Fuel Delivery in a Geo Metro. The Geo Metro is a "supermini" that Suzuki debuted in 1983 at the 25th Tokyo Motor Show under the name Suzuki Cultus. The Geo Metro debuted in North America in the 1989 model year manufactured jointly by Suzuki and General Motors but was picked up by Chevrolet in 1998. It remained in production in the United States until 2001.
Remove the control relay box cover and disconnect the fuel pump relay from the relay box connector to relieve fuel system pressure. Take out the circuit opening relay located over the left, lower kick panel. Start the Metro and let it run until it stalls and quits. Crank the engine for at least three seconds to relieve any remaining pressure.
Disconnect the negative battery cable and the fuel pressure sensor vacuum hose. Refer to the owner's manual for the line's location if you aren't sure which one it is.
Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely a faulty fuel pump pressure regulator, which means the fuel is flowing back into the lines instead of into the engine and there is not enough fuel in the engine for proper function. If there is no fuel in the lines, reattach the vacuum hose and continue with the fuel delivery diagnostic.
Reconnect the negative battery cable, start the engine and let it idle. Check the pressure gauge. The gauge needs to read 25 to 33 pounds per square inch. Pressure that's too high indicates a malfunctioning pressure regulator. Pressure that's too low indicates a clogged fuel filter or fuel pump that needs to be replaced.
Cut the engine and remove the pressure gauge. The fuel filter in the Geo Metro is integrated into the fuel sender assembly located in the fuel tank. The Metro fuel filter is not detachable to examine for clogs.