Question about 1988 Nissan 300ZX

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Flooding ,to much fuel .to engine ,it is not the fuel regulator

Flooding ,to much fuel

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Your sparkplugs might not burning all the fuel thats why its flooding. try changing your sparkplugs for better burning

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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SOURCE: engine floods when started,replaced oxegen sensor,

Generally, the first thing to check with an engine that floods on warm start is the water temperature sensor that talks to the fuel injection system. The only way the fuel injection system knows how much fuel to supply right after startup is by checking the water temperature. If the sensor says the water is cold, the fuel injection system will supply a lot of fuel. If the reading is in the valid range (just inaccurate) the computer will not recognize that the sensor is bad.
There are other possible problems, but this is where I would start. Someone needs to measure the resistance across this sensor and compare it to a chart in the manual to see if the resistance is correct for the current temperature that the sensor is seeing.

Posted on Jan 27, 2011

  • 3 Answers

SOURCE: when starting my 94 suburban, the fuel injectors flood the engine

replace them the seals at the top leak over time. Its throttle body injection and there are only 2 of them and are easy to replace.

Posted on Aug 05, 2009

  • 291 Answers

SOURCE: fuel pump issue, gradual flooding

NEED TO QUIT GUESSING.. IS THE CHECK ENGINE LIGHT ON.. SCAN FOR CODES. IF NONE THEN NEXT STEP IS TO CHECK FUEL PRESSURE.. IF IT IS GOOD.. THEN IF IT IS FLOODING OUT. ONCE IT IS FLOODED YOU CAN PULL SPARK PLUGS AND FIND THE ONE THAT IS WET,,, SUSPECT THAT INJECTOR TO BE STUCK OPEN

Posted on Nov 29, 2009

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1 Answer

My 98 Explorer is flooding out . Fuel pump is good and.i just replaced plugs and wires yesterday


How do you know its flooding out? Black smoke from tailpipe? An over fueled engine can be caused by numerous things. Check fuel pressure regulator on the fuel rail for an internal leak. Remove the vacuum hose to the regulator and check to see if fuel is in the vacuum hose. IF so, replace the regulator. You will need a scan tool to check the operation of the coolant temp sensor,map sensor,mass air flow sensor as these sensors/wiring circuits will adversely affect fuel delivery

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The engine is getting extra fuel from a ruptured fuel pressure regulator it is located on the fuel rail and gets manifold vacuum to operate remove small hose and if has gas in it the replace it.

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Flooding starting


Check fuel pressure. You may have a bad fuel pressure regulator. Pressure may be too high, or the regulator diaphragm may have failed-if it is vacuum operated, pull off the vacuum line-if any evidence of gas in the line, the regulator has failed, and letting gas get sucked into the engine through the vacuum line. That could explain the gas smell and the flooding.

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Check the fuel pressure. The pressure regulator may have gone bad and is delivering too much pressure to the fuel rail, thereby flooding the engine.

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Car floods and starts hard when first started


ENGINE FLOODING COULD BE CAUSED BY FAULTY FUEL PRESSURE REGULATOR.FAULTY MAP SENSOR, WEAK IGNITION SPARK.DIRTY FUEL INJECTORS LEAKINGSTICKING OPEN. FLOODING OUT ENGINE.CLEAN THE FUEL INJECTORS AND CHANGE AIR FILTER.

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1 Answer

Car ships replaced wires plugs o2 sencer sometimes acts like it is flooding run fine on open road.


If it acts like it is flooding while idling, but it runs fine on the road, it could be running too rich and flooding it out due to leaking injectors, bad fuel pressure regulator, or excessive fuel pressure.

I would start by replacing the Fuel Pressure Regulator since it doesn't cost as much as the injectors.
Check your fuel pressure using a Fuel Pressure Check Gauge to see if the fuel pressure regulator is maintaining the proper pressure.

Vacuum is attached to the Fuel Pressure Regulator to control system pressure. When the fuel pressure regulator is not functioning properly it causes the fuel pressure to be above normal operating pressure. This condition causes excess fuel to be injected causing a rich mixture that produces black smoke.

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1 Answer

Fuel pump issue, gradual flooding


NEED TO QUIT GUESSING.. IS THE CHECK ENGINE LIGHT ON.. SCAN FOR CODES. IF NONE THEN NEXT STEP IS TO CHECK FUEL PRESSURE.. IF IT IS GOOD.. THEN IF IT IS FLOODING OUT. ONCE IT IS FLOODED YOU CAN PULL SPARK PLUGS AND FIND THE ONE THAT IS WET,,, SUSPECT THAT INJECTOR TO BE STUCK OPEN

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FLOODING WITH WHAT FUEL OR WATER ??????????????????

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Car won't flood because of the TPS. But it will if the "fuel pressure regulator" is out of range (vacuum line is off?). The TPS is part of the throttle body.

May 15, 2008 | 1988 Oldsmobile Calais

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