Starts fine then cuts out after 30 seconds, a few holes, or under load. Gas: fuel delivery. Electric: voltage cutoff or thermal shutdown.
Gas cart: Runs fine then dies after 5–10 minutes = fuel starvation (blocked fuel line or carb float bowl not refilling). Runs fine then dies after 30 seconds = carburetor idle circuit issue or choke stuck closed. Electric cart: Runs fine then cuts out under load = battery voltage dropping below controller low-voltage cutoff. Measure pack voltage immediately after a cutout.
Vapour lock or float bowl not refilling. Check fuel flow at carb inlet.
Pilot jet clogged. Clean carb thoroughly, especially idle circuit passages.
Battery voltage sag past controller cutoff. Measure voltage immediately post-cutout.
Thermal cutoff on controller. Allow cool-down and check battery health.
The most common cause of a gas golf cart running for 5–15 minutes then dying is fuel starvation. The carburetor has a small float bowl that holds a few ounces of fuel. The float and needle valve regulate flow from the tank. When a cart runs briefly then dies, won't restart immediately, but starts again after a few minutes of rest — that pause is the float bowl slowly refilling through a partially blocked fuel system.
Check the fuel filter first (replace if it's been more than 2 years, $5–$15). Then check fuel flow: disconnect the fuel line at the carb inlet and let it drain into a container for 30 seconds. Good flow = filter and petcock are clear. Weak flow = blocked filter or petcock.
If the cart runs fine at speed but dies when you release the pedal or slow down, the pilot/idle circuit is blocked. The carburetor's idle circuit feeds fuel at very low throttle positions. It's a tiny passage (0.3–0.5mm) that clogs easily with ethanol varnish. Carb cleaning or pilot jet replacement resolves this in 80% of cases.
If the cart only runs with the choke engaged and dies when it's pushed off, the main fuel circuit isn't delivering. Could be a clogged main jet. If the choke is a manual type, ensure it's being fully released after warmup — a stuck choke will cause the mixture to go too rich once the engine warms up, causing stalling.
Every golf cart controller has a low-voltage cutoff (LVC) — a threshold below which the controller shuts off motor output to prevent battery damage. On a 48V system, this is typically set to 42–44V. A pack that's aging or has a failing cell will sag below this threshold under load (climbing a hill, full acceleration) and trigger a cutoff. The cart then coasts to a stop, you wait 30–60 seconds (voltage recovers at rest), it starts again, and the cycle repeats. Measure pack voltage immediately after a cutout — below 42V = battery problem.
Controllers have thermal protection that shuts them down to prevent internal damage if they overheat. This typically takes 20–45 minutes of heavy use on a hot day. After a thermal shutdown, the cart needs 10–20 minutes to cool before it will operate again. If this is happening regularly, check that the controller heat sink isn't blocked by debris and that battery health is good (weak batteries make the controller work harder, generating more heat).
| Cause | Fix | Cost |
|---|---|---|
| Clogged fuel filter (gas) | Replace filter | $5–$15 |
| Blocked carb idle circuit (gas) | Clean carb or replace pilot jet | $10–$35 |
| Battery voltage sag (electric) | Replace battery set | $400–$700 |
| Controller thermal shutdown (electric) | Check battery health; clean controller heatsink | $0–$50 |
In-line fuel filter for gas golf carts. Replace every 2 years or if experiencing fuel starvation symptoms.
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