1010 W Commonwealth Ave, Fullerton, CA 92833 Tue–Fri 9:00 AM–6:00 PM · Mon & Sat by appointment · Sun closed ASE Certified Master Technician · Family Owned
Cedillo's Your One Stop Auto Shop logo — Fullerton, CA Cedillo'sClassic & Auto Repair

Auto Repair Tips

Bringing a Classic Car Back After It’s Been Sitting

Updated October 15, 2026 · Cedillo's Classic & Auto Repair, Fullerton

Classic Mustang GT350 on a lift at Cedillo's in Fullerton
Short answer: Don’t crank it right away. Old fuel, dry seals, a dead battery and moisture in the brake fluid are common. Inspect fuel, ignition, brakes and fluids first.

Why sitting is hard on a car

Fuel goes stale and can gum up a carburetor. Rubber hoses dry out. Brake fluid absorbs moisture. Batteries die. Critters build nests.

What we check first

  • Fuel condition, tank, lines and filter
  • Battery and charging
  • Ignition
  • Brakes, fluid and hoses
  • Oil, coolant, belts, hoses and tires

Getting it running

After inspection, a sitting classic can often be brought back. Rafael will explain what he found and what it will take.

Fuel is usually the first problem

Gasoline breaks down over time. After a long sit, it can leave varnish in the tank, lines and carburetor. Running stale fuel through a carburetor that’s been sitting is a common cause of hard starts and poor running.

We look at the fuel first so we don’t pull old fuel and debris into the engine.

Brakes before the first drive

Brake fluid absorbs moisture over time, and wheel cylinders and hoses age even when a car isn’t driven. Before a sitting classic goes back on the road, we inspect the brakes so the first drive isn’t a surprise.

Serving Fullerton and nearby

Cedillo’s Classic & Auto Repair is a family-owned shop at 1010 W Commonwealth Ave in Fullerton, serving Fullerton, Anaheim, Placentia, Brea, Buena Park, La Habra, Yorba Linda and Orange. Owner Rafael Cedillo is an ASE Certified Master Technician with more than 25 years of experience.

Frequently asked questions

Can you get my classic running again?

Often, yes, after we inspect it. We’ll tell you what we find before we start.

Can you find parts for an older car?

Yes, we source hard-to-find parts. Have your year, make and model ready.

Related services

We make it easy to do business with us, with peace of mind and trust. Give us a try, and if it’s not something we can help with, we’ll point you in the right direction. Call or text (714) 681-0101, or send a service request online. We’re open Tuesday through Friday, 9 AM to 6 PM, and Monday and Saturday by appointment.