Checking Fuel Pressure

Fuel pressure should be verified periodically to catch a failing pump, clogged filter, or regulator issue before it affects performance or strands you on track.

Spec: 45 PSI at idle (42 PSI if your gauge has been individually calibrated)

Checking Pressure — Cockpit Tank Cars (6-Gallon Behind-the-Seat System)

The 6-gallon cockpit fuel cell system includes a fuel pressure sensor that feeds the AiM dash. Fuel pressure is visible as a live channel on the AiM display without any additional tools. Check it at idle after the car has warmed up.

Checking Pressure — Older 5-Gallon Tank Cars

Older cars with the 5-gallon tank system include an inline fuel pressure gauge mounted visibly in the engine bay. Read it directly at idle.

Manual Check (Any Configuration)

If the gauge or AiM reading is unavailable, you can verify pressure at the Schrader valve on the fuel rail:

1. Ensure the car is cooled down and engine is off.

2. Attach a fuel pressure gauge with a Schrader valve adapter to the valve on the injector rail.

3. Start the engine and read at idle — spec is 45 PSI.

4. If pressure is low, inspect the fuel filter before assuming a failing pump. See Cleaning Fuel Filter.

5. Detach the gauge — the Schrader valve is self-sealing.

Have a rag handy when attaching or detaching the gauge — a small amount of fuel will escape from the Schrader valve.