2003 Mazda MPV

Hi Jamie,

Thank you for the donation.

The standard fuel pressure should be 26 psi (179kPa) and you mentioned 71 psi which is very high and can mean a faulty fuel pressure regulator.

Following are possible causes and recommended chack list.

"� Check for improper operation of A/C system.
"� Check for erratic signal or no signal from CMP sensor.
"� Check for air leakage from intake-air system parts.
"� Check for purge solenoid valve malfunction.
"� Check for improper operation of electronic throttle control system.
"� Check for EGR valve malfunction.
"� Check for erratic signal from CKP sensor.
"� Check for low engine compression.
"� Check for vacuum leakage.
"� Check for poor fuel quality.
"� Check for main relay intermittent malfunction.
"� Check for throttle body malfunction.
"� Check for engine overheating.
"� Check for spark plug malfunction.
"� Check for improper air/fuel mixture control operation.
"� Check for erratic signal to ignition coil.
"� Check for air cleaner restriction.
"� Check for PCV valve malfunction.
"� Check for incorrect valve timing due to jumped timing belt.
"� Check for restricted exhaust system.
"� Check for intermittent open or short in fuel pump circuit.
"� Check for inadequate fuel pressure.
"� Check for fuel line and/or fuel filter restriction or clogging.
"� Check for pressure regulator malfunction.
"� Check for APP sensor misadjustment.
"� Check for TP sensor misadjustment.
"� Check for fuel pump mechanical malfunction.
"� Check for fuel leakage from fuel injector.
"� Check for fuel injector clogging.
"� Check for intermittent open or short of MAF sensor, APP sensor, TP sensor and VSS.
"� Check for ATX malfunction (ATX).
"� Check for spark plug malfunction.
"� Check for spark plug wire malfunction.
"� Check for clutch slippage (MTX).