Car turns over but wont start. i checked the fuel pump for pressure and it was good. i also replaced spark plugs because they were place , when i cleaned them up it started for a little while that day. we cleaned out the fuel filter and gas tank there was a a lot of rust we cleaned out of the gas tank. there was also thick black smoke coming out of the pipe when it fired. someone told me that it may still be my fuel pump, if not, any suggestions?
Make sure battery has a full charge. If it cranks good but won't start, check the basics. Have a helper crank it while you visually check for spark at the spark plugs, if spark everywhere, use a gage and check proper fuel pressure. I looked at info for the 3.8L engine, 35--40 psi. Also, after you build fuel pressure, turn off the key, see if fuel pressure holds for a bit? If the pressure drops like a rock, check for fuel pressure leak. Check the vac line for fuel pressure regulator, if it has gas in it, the regulator is faulty, or a leaking fuel injector. The pressure could also drain back through fuel pump.
Also, check fuel injector pulse, engine cranking. Any applicable trouble codes?
Smell of the crankcase oil dipstick, if it smells like gas, either you don't change oil and filter very often or the engine is running very rich for some reason.
SOURCE: REPLACING THE FUEL PUMP ON A 1998 MECURY GRAND MARQUIS
So you have power there, why not try a little whap with rubber hammer near it while key on to see if it will do anything. I;d try it just to see if it will come back to life.
SOURCE: 1999 mercury cougar will not start has power
turn the key and listen for the fuel pump to kick on
SOURCE: 1998 Mercury Grand Marquis Fuel Pump Replacement
you can try just resetting the fuel pump switch located in the car
the switch is originally in the car for in case of an accident, however, if changed, chances are you also have to reset it
in my 98 grand marquis, the switch is on the left side of the trunk
SOURCE: I have a 93 mercury topaz 4cyl 2.3L that stalls
It sounds to me like you replaced everything but the most likely cause of a stall while driving...The crank sensor.
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