# 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](https://github.com/Rush-Auto-Works/RushSR-Manual/blob/main/maintenance/each-year/cleaning-fuel-filter.md).
5. Detach the gauge — the Schrader valve is self-sealing.

{% hint style="warning" %}
Have a rag handy when attaching or detaching the gauge — a small amount of fuel will escape from the Schrader valve.
{% endhint %}