SOURCE: On my 1992 Ford Aerostar 3.0 Engine (fuel
In the old days, I would have said a leaking fuel pump diaphragm, but that can't happen anymore.
Assuming the engine does not run as rough as one with a bad plug would be, then I would suspect an injector.
If an injector does not seal up when off, then about a pint of gas will slowly drip into the crankcase every night.
Remove the injectors from the manifold, but leave on the fuel rail. Then turn the key or shunt the relay in order to turn the fuel pump on for a few seconds. The injectors should only fire intermittanly when their time comes. After that there should be no drips. If one is dripping or has a bad spray pattern that is not a cone, replace it.
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.
SOURCE: 4.3 liter v6 throttle body fuel injection fuel
check your fuel pressure and then check fuel pressure regulator fuel psi should be around 35 lbs
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