Why does my old Mercury Comet die on sharp left turns?

Short answer: If your 1960s Comet dies on sharp left turns, the carburetor float is usually sticking or out of adjustment, so fuel sloshes and floods or starves the engine. One owner fixed it by rebuilding the carb with a new float. If the car pulls when you brake, the drum brakes likely need adjusting or one side isn't working.

Symptom: The engine stalls on sharp left turns, or the car pulls to one side when braking.

What to check first

1. Check the carburetor float level and condition.
2. Look for a fuel-logged or sticking float.
3. Adjust all four drum brakes and check each line for flow.
4. Check coil and distributor wires for bare spots.

Likely causes

1. Carburetor float stuck or saturated. The float controls the fuel level in the carburetor. If it sticks, gets fuel-logged or is set wrong, fuel sloshes on turns and the engine floods or starves.
2. Drum brakes out of adjustment. Old drum brakes need adjustment. If one side grabs less, the car pulls when you brake.
3. Clogged brake line. A clogged line leaves one brake doing little or nothing.
4. Ignition wiring shorting. Worn coil and distributor wires can short when the engine moves on its mounts.

What it usually costs

Owners didn't post prices.

Is it safe to keep driving?

Stalling in a turn means losing power steering assist (if equipped) and brake assist. Pulling under braking is unsafe. Fix both before regular driving.

DIY or shop?

Carb rebuilds and drum brake adjustment are classic DIY jobs on these cars if you have experience.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA's recall list for the Comet mostly covers later models (such as 1975 and 1977), and none match this problem on 1960s cars. Recall records from the early 1960s are sparse. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 0 keyword-matched complaints for Mercury Comet 1960–1977 (of 2 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-29; keywords: stall, cut(s)? out, fuel, ignition, carburet) (NHTSA returned no data for 19 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 1963 Mercury Comet Engine cuts out on Car Talk, a 1963 Comet with the small six and automatic cut out only on sharp left turns, then restarted when the wheels straightened. Members said older carburetors could starve or flood on turns and pointed to a sticking, saturated or misadjusted float.
• In 1963 Mercury Comet Strange behavior on Car Talk, the same owner rebuilt the carb with a new float, which fixed the left-turn stall, then replaced a clogged rear brake line. Now the car pulled left when braking and the engine almost died. Members said the drum brakes needed adjusting, starting with the right front, and suggested checking coil and distributor wiring for bare spots.

Quick tip

On these old cars, fix the brakes first. Drum brakes in perfect shape still stop much worse than modern discs.

Vehicle focus: Mercury Comet compact, 1960-1967 (the threads are about a 1963 with the 170 six).

Safety / mechanic note

Brakes and stalling are safety items. Verify with a mechanic.