A modern fuel system delivers gasoline (or diesel) from the tank to each cylinder under precise pressure and timing — and modern engines are sensitive to all of it. A weak fuel pump, a fouled injector, or a clogged filter manifests as reduced fuel economy, rough idle, hesitation under acceleration, or a check-engine light pointing at fuel trim. Frank's Automotive diagnoses fuel-system problems with proper pressure equipment and injector analysis, not by throwing parts at it.
What's involved
- Fuel pressure test — static (key on, engine off) and running. Modern fuel systems run anywhere from 40 to 90+ PSI depending on engine design
- Fuel filter inspection or replacement — many modern vehicles have lifetime in-tank filters; older vehicles have inline filters with replacement intervals around 30,000 miles
- Fuel pump diagnosis — current draw and pressure-and-volume tests. A failing pump can pressure-test fine and still fail to deliver enough volume under load
- Injector flow analysis — most "injector cleaning" sold as a flush is mediocre. Real service involves bench-testing each injector, or running a professional-grade chemical service through the rail
- Direct-injection carbon cleaning — modern direct-injected engines (VW, Audi, BMW, Ford GDI, others) build carbon on intake valves that fuel additives can't reach. We do walnut-blasting where required
- Tank and module work — fuel-pump module gaskets, level-sender problems, evap-system codes traceable to the tank
Symptoms to watch for
- Fuel economy drops noticeably — your normal mpg falls 10–20% with no other change
- Hesitation, stumbling, or surging under acceleration
- Rough idle, especially during cold-start
- Long crank before the engine starts (fuel pressure bleeding off at rest)
- Check-engine light with fuel-trim codes (P0171/P0174 system lean, P0201–P0208 injector circuits)
- Fuel smell at the vehicle — pull over and don't drive further
- Reduced power combined with lower fuel economy — often direct-injection carbon buildup
A fuel-system problem rarely fixes itself. The longer you drive on weak pressure or fouled injectors, the more strain on the catalytic converter, and the closer you get to a $1,000+ parts bill.
Why Frank's
ASE Certified and a Bosch Service Center — Bosch makes the injectors, fuel pumps, and direct-injection hardware in a large share of modern vehicles, and we have the equipment to service them properly. OEM-equivalent components. Covered by our 24-month / 24,000-mile warranty.
If you smell fuel or see fuel under the vehicle, call us now — (830) 379-4840. For drivability concerns, request an appointment.