Yamaha G5 Sun Classic Fuel Pump Hose & Line Routing

The gasoline Yamaha G5 Sun Classic golf cart uses a low-pressure three-line fuel-pump layout: tank supply to pump inlet, pump outlet to the carburetor, and an engine pulse/impulse line to the diaphragm pump.

Yamaha Fuel Hose Guide

G5 Sun Classic • Fuel pump hose routing

3-line low-pressureRouting

Tank → pumpInlet

Pump → carbOutlet

Engine → pumpPulse line

G5 Sun Classic fuel-line routing at a glance

Fuel tankSupply line to pump inlet

Diaphragm pumpInlet + outlet + pulse/impulse port

CarburetorPump outlet to carb inlet

Engine / crankcase → pulse / impulse line → pump

No fuel at pump

Check tank pickup, filter and supply hose.

Pump new but dry

Recheck inlet, outlet and pulse ports.

Starves under load

Inspect pulse hose and suction-side restriction.

Use destinations

Do not identify hoses by colour alone.

Tank → inletOutlet → carbEngine → pulse portLow-pressure

How the Yamaha G5 Sun Classic fuel lines are routed

Photograph and label every hose before disconnecting it; replacement hose colour is not a reliable identifier.

Trace the tank supply line to the pump inlet. Check the pickup, filter and hose for restriction or collapse.

Trace the pump outlet line to the carburetor fuel inlet.

Trace the pulse/impulse hose from the pump back to the engine or crankcase pulse source; this line is not a normal fuel-supply hose.

Reconnect each hose to the correct port, preserve factory clips/routing and keep the lines away from exhaust heat, belts, clutches and sharp edges.

After service, start the engine and inspect every disturbed fuel connection for leakage.

Common G5 Sun Classic hose-routing mistakes

Swapped inlet/outlet

A diaphragm pump may not draw or deliver fuel if the supply and outlet connections are reversed.

Fuel hose on pulse port

The pulse/impulse port is driven by engine pressure pulses; connecting a fuel line there prevents correct operation.

Leaking pulse hose

A split or loose pulse hose can make a good pump appear faulty.

Collapsed suction hose

Old soft hose can flatten under suction and cause load-related starvation.

G5 Sun Classic fuel hose and line layout

Pump/system: Low-pressure diaphragm pump.

Engine/system: Legacy Yamaha gasoline / carbureted.

Routing: Fuel tank → pump inlet; pump outlet → carburetor; engine pulse line → diaphragm pump.

Applies to: Legacy gasoline.

Model-specific note

Legacy gasoline G5 Sun Classic versions use a low-pressure carbureted pump layout; exact hose routing varies by model year.

Yamaha G5 Sun Classic fuel hose FAQ

How are the Yamaha G5 Sun Classic fuel-pump hoses routed?

On gasoline versions of the Yamaha G5 Sun Classic golf cart, route fuel from the tank to the pump inlet, from the pump outlet to the carburetor, and connect the engine pulse/impulse source to the pump pulse port.

Which hose is the pulse line on the Yamaha G5 Sun Classic?

It is the non-fuel hose that runs from the engine/crankcase pulse source to the diaphragm pump. Trace the hose by destination rather than colour.

What happens if the Yamaha G5 Sun Classic pump hoses are backwards?

Reversing inlet, outlet or pulse connections can stop fuel delivery or make a replacement pump appear faulty.

Can a bad pulse hose cause Yamaha G5 Sun Classic fuel starvation?

Yes. A split, loose, blocked or collapsing pulse/impulse hose can reduce diaphragm-pump output, especially under load.

Should old fuel hose be replaced on a Yamaha G5 Sun Classic?

Replace hose that is cracked, hardened, swollen, soft, loose on its fitting or incorrectly routed.

Can I identify Yamaha G5 Sun Classic fuel-pump hoses by colour?

No. Hose colours change with repairs. Identify the tank supply, carburetor outlet and pulse line by where each one connects.

Verify with official documentation

Fuel-line routing, pump type, connectors and pressure requirements can vary by model year, engine and serial range. Before disconnecting or replacing any line, confirm the routing in the official owner, operator, parts or service manual for your exact Yamaha G5 Sun Classic. For current documentation, visit the official manufacturer website.