Tank to sparkFuel
System

Wrong fuel in the tank

Gasoline in a diesel, or diesel in a gas car, is one of the most common fuel system repairs we do. It happens to more people than you'd think, and it is fixable.

If you caught it at the pump: don't start the engine. Running it is what turns an expensive afternoon into a much more expensive one. Call us and we'll tell you exactly what to do next.

EVAP leaks are a classic check-engine trigger — a small break in the vapor system that's invisible from outside the car. Weak pumps and dirty injectors show up as hard starts, rough idle, and hesitation. Whatever the symptom is, we trace it to the component before quoting the repair.

The engine is what turns it expensive

Wrong fuel sitting in a tank is a contained problem. Wrong fuel pulled through the system is not.

Turn the key and the pump moves it out of the tank and into the lines, the filter, the rail, and the injectors. Now every one of those has to be dealt with instead of just the tank. In a diesel it's worse — the fuel is the lubricant for the injection system, and the wrong fuel strips that protection while the engine is running on it.

If you caught it at the pump, leave it. Don't start it to move it. Call and we'll tell you what's next.

The system that fails without a symptom

The evaporative emissions system captures fuel vapor from the tank and routes it back to be burned instead of vented. It's sealed, it's monitored, and when it develops a leak the only thing you notice is the check engine light.

The most common cause is the cheapest one: a gas cap that isn't sealing, either not tightened or with a hardened seal. Past that it's the purge valve, the vent valve, the charcoal canister, or a cracked line — and a small leak is invisible from outside the car.

It won't strand you, but it won't pass a smog check either, and it can't be diagnosed by looking. It has to be tested.

Same symptom, different component

A weak fuel pump, restricted injectors, and worn spark plugs all produce rough running — and they are not the same repair.

A failing pump usually shows up as long cranking before it catches, or a stumble under load when demand rises. Restricted injectors are more often a rough idle that smooths out once you're moving. Worn plugs bring misfire codes and a shake you can feel at idle.

Additives in a bottle don't fix a mechanical fault. If a can of cleaner made the problem go away for a week, the problem is still there. Whatever the symptom is, we trace it to the component before quoting the repair.