Back to 2006 Mazda Mazda3
Help

2006 MAZDA MAZDA3

2.3L I4•FWD•AUTOMATIC•gas
2 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor564Torque3689Fluid6DTC823Battery0Maintenance0Recalls2
P3657high severityPowertrain

GDI Fuel System Priming Pump Performance

on 2006 Mazda Mazda3 2.3L I4 · FWD

What this code means

The low-pressure electric fuel pump that primes the GDI high-pressure fuel system is not delivering adequate fuel volume or pressure to the HP pump inlet.

Symptoms

  • Extended cranking time
  • Hard start after sitting
  • Fuel rail slow to build pressure
  • Engine stalling after start
  • HP pump cavitation noise

Common causes

  • Weak fuel pump motor
  • Clogged fuel filter
  • Fuel pump check valve leak
  • Fuel tank pickup sock restricted
  • Fuel pump relay intermittent

Diagnostic steps

  1. Measure fuel pressure at HP pump inlet
  2. Test electric fuel pump current draw
  3. Check fuel filter restriction
  4. Test fuel pump check valve hold pressure
  5. Inspect fuel pump relay and wiring

Repair notes

Replace low-pressure fuel pump or fuel filter. GDI systems are sensitive to feed pressure - even slight deficiency causes HP pump issues.

Other Powertrain codes on this vehicle

⚠ STILL BEHIND THE PAYWALL
The 2006 Mazda Mazda3 repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Mazda Mazda3 — $99 →
Building an app?
Free API access to all this data — 50 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →