On gasoline versions of the E-Z-GO Express S4 golf cart, the fuel pump is typically at or beside the fuel tank on newer EFI versions; older carbureted versions typically use a pulse pump in the engine/fuel-tank area under the seat.
Express S4 • Gasoline versions
Where is the Express S4 fuel pump?
Typical location: at or beside the fuel tank on newer EFI versions; older carbureted versions typically use a pulse pump in the engine/fuel-tank area under the seat.
Before ordering: Confirm the model year and engine before ordering a pump because the same model name can span carbureted and EFI generations.
How to replace the E-Z-GO Express S4 fuel pump
Express S4 fuel pump specs and hose layout
Fuel system: Gas versions vary by year: newer EX1 models use closed-loop EFI; older gas versions may use a pulse/diaphragm pump.
Fuel-line layout: EFI: pressurized supply line and electrical pump circuit. Older carbureted: tank inlet, carburetor outlet and crankcase pulse line.
Pressure: EX1 EFI: 43.5 psi (3 bar) on documented RXV/Valor-family manuals; carbureted versions are low-pressure.
Check these before buying a fuel pump
Identify the system: Do not order a pump by model name alone when the same model spans carbureted and EFI years.
Carbureted versions: Check the pulse hose, filter, tank vent and suction hose before replacing the diaphragm pump.
EFI versions: Check fuse/relay, pump voltage and ground, filter/strainer and measured fuel pressure before replacing the electric pump.
Fuel hoses / lines: Inspect for damage, restriction, air leaks and previous repairs.
Tank vent: A blocked vent can cause fuel starvation on either system.
Express S4 quick check: Identify EFI versus carbureted hardware before testing or ordering parts, because the two systems use different pumps and diagnostics.
Express S4 fuel pump troubleshooting
Cranks but will not start
Identify the fuel system, then test pulse/fuel flow on carbureted versions or pump power/pressure on EFI versions.
Starts then dies
Check the tank vent and filter first, then test the system-specific pump input and output.
Weak under load
Low EFI pressure, a weak diaphragm pump, a leaking pulse hose or a restricted filter can all cause load-related starvation.
Fuel leaking
Stop running the vehicle and repair the leaking hose, fitting, pump/module seal or tank connection.
E-Z-GO Express S4 fuel pump FAQ
Where is the fuel pump on an E-Z-GO Express S4?
On gasoline versions, the fuel pump is typically at or beside the fuel tank on newer EFI versions; older carbureted versions typically use a pulse pump in the engine/fuel-tank area under the seat. Confirm the model year and engine before ordering a pump because the same model name can span carbureted and EFI generations.
How do you replace the E-Z-GO Express S4 fuel pump?
First identify the model year and fuel system. EFI versions use an electric tank-area pump/module; older carbureted versions use a low-pressure diaphragm pump with inlet, outlet and pulse connections.
Does every E-Z-GO Express S4 use the same fuel pump?
No. This model family spans more than one fuel-system generation, so the correct pump depends on model year, engine and whether the vehicle is EFI or carbureted.
How can I tell whether my E-Z-GO Express S4 is EFI or carbureted?
Look for an injector/throttle-body EFI system and an electric pump connector at the tank on EFI versions. Carbureted versions use a carburetor and typically a three-line pulse/diaphragm pump.
What fuel pressure should the E-Z-GO Express S4 have?
EX1 EFI: 43.5 psi (3 bar) on documented RXV/Valor-family manuals; carbureted versions are low-pressure. Confirm the exact model year before testing because carbureted and EFI versions use very different fuel-pressure ranges.
What should I test before replacing the E-Z-GO Express S4 fuel pump?
On a carbureted version, inspect the pulse hose, filter, tank vent and pump output. On an EFI version, check fuse/relay, voltage, ground, filter/strainer and measured fuel pressure.
Fuel-system design, pump type, location and specifications can vary by model year, engine and configuration. Before ordering parts or servicing the fuel system, verify the details against the official owner, operator or service manual for your exact vehicle. For the latest official documentation, manuals and model information, visit the manufacturer website: official manufacturer website.