Fuel Pump and Sending Unit Diagnostics
Auto Electrical Repair — Cheyenne, WY
Fuel pump symptoms — long cranking, sputtering under load, dying at speed and restarting later — overlap with plenty of other faults, and the pump is buried in the tank, so proper diagnosis before replacement saves real money. Trevor tests fuel pressure and volume, checks the pump's power and ground circuits (a voltage-drop on aged wiring imitates a dying pump perfectly), and confirms the fault before the tank comes down.
The sending unit that runs your gas gauge lives in the same assembly, so a gauge that reads wrong, sticks, or swings wildly is often fixed in the same job. Quality pump assemblies and clean-tank practices keep the new pump from inheriting the old one's problems.
What's Included
- Pressure, volume and circuit testing before replacement
- Voltage-drop testing on pump wiring
- Gas gauge and sending unit repair
- Quality pump assemblies, tank cleaned at replacement
- Gas and diesel lift pump work
Electrical Diagnosis, Step by Step
- Define the symptom
When it happens, what changes it, what else acts up at the same time — electrical faults leave patterns.
- Test the circuit
Voltage, ground and load testing at the component and along the circuit narrows the fault to a segment.
- Find the actual fault
Broken wires, corroded connectors, failed components — confirmed by measurement before repair.
- Repair and verify
Proper wiring repairs (soldered and sealed, not twisted and taped) and the fix verified under real conditions.
Related Electrical Services
Frequently Asked Questions
How much does fuel pump & sending unit service cost at TDC Automotive?
Labor is billed hourly at $125/hr for gas vehicles and $135/hr for diesel, and you'll get findings and an estimate before repair work begins. Call (307) 996-0980 with your year, make and model and Trevor can give you a realistic idea of what's involved.
Do I need an appointment for fuel pump & sending unit service?
Call ahead at (307) 996-0980 — as an owner-operated shop, TDC schedules work so your vehicle gets Trevor's full attention rather than sitting in a lot for a week.
Where is the shop, and what area do you serve?
The shop is at 8407 Aztec Drive in Cheyenne, Wyoming, and serves all of southeast Wyoming plus the Nebraska panhandle and Northern Colorado — customers regularly drive in from Laramie, Wheatland, Torrington, Pine Bluffs, Wellington, Fort Collins and Greeley.