Engine Bogging at 5,250 RPM After Bad Gas - Tank Flush and Filter Replacement

Fuel Systembeginner✓ OP Confirmed

Problem

After accidentally running bad gas through the car, the engine would bog down and lose power at approximately 5,250 RPM under load, mimicking a fuel cut or rev limiter. Replacing the fuel filter temporarily resolved the issue, but the new filter quickly became clogged again from residual contamination in the fuel tank.

Engine bogs down at ~5,250 RPM under loadLoss of power at high RPM resembling a fuel cutSymptoms return shortly after replacing fuel filterBad smell from fuel when drainedFuel appears green or yellow instead of normal clear with blue-yellow tintDramatically degraded acceleration (13-second 0-60)

Root Cause

Contaminated (bad) gas left residual deposits and particulates in the fuel tank that repeatedly clogged the fuel filter and restricted fuel delivery under high demand. The contaminant would settle in the tank and get picked up by the fuel pump when driving hard.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted September 2023 on SupraForums.com