Mail-In Fuel Injector Cleaning Service

Most towns don't have a dedicated fuel injector cleaning service. That's why mail-in exists. You remove the injectors, box them up, and ship them to us with a prepaid label. We ultrasonically clean every injector, flow test each one individually, replace O-rings and filters where available, and ship them back ready to install. The whole process takes about a week from your door back to your door.

Local to the South Shore? You can skip shipping and drop off in person instead.

We work with customers across the country: daily drivers, project cars, boats, motorcycles, ATVs, and everything in between. If it has gasoline fuel injectors, we can clean and test them.

Every set runs the same eight steps. Nothing gets skipped because a set looks clean, and nothing gets added because it looks bad. A fixed process is the only reason the before-and-after numbers mean anything.

1. Resistance check. We measure the coil on every injector before anything else. A dead or out-of-spec coil is an electrical fault and cleaning will not fix it. Better to find that first than after you have paid for a clean.
2. Pre-cleaning flow test. Each injector is tested individually at static, low and high setpoints. This is your baseline, and it is the number that shows how restricted the set actually was.
3. Ultrasonic cleaning. The injector is submerged in an ultrasonic bath while being pulsed and backflushed, which breaks apart carbon, varnish and ethanol residue from inside the body.
4. Backflushing. Solvent is driven through the injector in reverse to push loosened debris back out of the inlet rather than deeper into the passages.
5. Post-cleaning flow test. The same test as step two, on the same bench at the same setpoints, so the comparison is honest rather than flattering.
6. Leak-down test. The injector is held at pressure with no pulse commanded to confirm it seals shut. A leaking injector drains fuel into the cylinder after shutdown, and it is the failure a scan tool cannot see.
7. Spray pattern inspection. Visual check that the pattern is a fine, even mist. An injector can flow near spec and still spray in a stream, which causes exactly the symptoms people blame on everything else.
8. Component replacement. New o-rings, pintle caps, micro-filters and seals where parts exist for your injector. Included, not an upsell.

How long it actually takes

Bench time is one to two business days from the day your box lands. The rest is transit. From New England expect about a week door to door. From the Midwest or the South, closer to eight or nine days. From the West Coast, Alaska or Hawaii, ten to twelve. USPS Ground Advantage is the slow part, not the bench.

If you are working to a deadline, say so on the order form and we will tell you honestly whether it fits rather than let you find out at the end.

Packing them so they arrive intact

Bag each injector separately so they cannot knock against each other, leave the o-rings on, and wrap the set inside a small box with no room to shift. The failure we see most is a set shipped loose in an oversized box, where the pintles take the impact. A padded envelope on its own is not enough.

There is a full packing guide here, and a removal guide if you have not pulled a set before.

If USPS damages or loses them

Every order ships on a tracked label in both directions. Optional shipping insurance is available at checkout and is worth taking on anything hard to replace, particularly discontinued marine injectors where a replacement set runs into the hundreds. If a package goes missing we file the claim and stay on it with you.

If an injector cannot be saved

Some cannot. A shorted coil, a cracked body, a seized pintle, or internal wear past the point cleaning reaches. When that happens you get told which injector and why, with the test data behind it, and we will point you at the correct replacement part number.