93 taurus, 3.0 No start

i got a 93 taurus, 3.0.. the other day i replaced the key lock mechanism as you could start the car without a key.. the casing on it would turn and then start the car up.. no problem...... the next day i take the car
for a drive at 9 pm and go about 10 miles to store and park it for about 20 minutes. and no start.. it will crank and crank.. but no start... i wait a while and it starts right up... drive 10 miles back home and no problem driving it and park it and try to see if it starts and for about three times it starts right up... the next morning it starts right up... about 2?00 PM i drive out of garage and turn motor off and close garage door and it wont start, just cranks forever... i check the coil and find that there is voltage to the coil.. i put the timing light on the spark plug wires and see it get fire....... but still will not start up... i remove the emergency gas cut off valve in the trunk and bypass it and see that its getting voltage and it still will not start. this whole time it has a strong crank and spins pretty good(so i have a good battery)....wait about 20 minutes and it starts right up... i then spray some throttle body cleaner into the throttle body and race the engine and it spray some more as the engine races and it seems to run pretty good... starts right up... so i guess it might be fuel related... i got a hearing loss(cant hear some whinning sounds and such) so i cant hear the fuel pump....dont know if its working on not(it must be working sometime???)... i then take off the fuel filter.... the old one leaked gas and i checked it out... pretty dirty looking gas..... could this be the culprit??? the gas might be bad???? or have 11 yrs. of dirt build up in the tank and its finally breaking loose and blocking up the fuel parts like the injectors???? i hate to take off the gas tank and find that the pump is good with all that work for nothing... i tried to get a rental tool from auto zone to test the pressure and found out that auto zone does not have the tool rental for a fuel pressure tester........ any suggestions or help will be appreciated.....
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jim opined in

If you got dirty looking gas out of the fuel filter, that's good enough reason for pulling the tank.
And you might as well replace the pump while you are at it. Besides which, dirty gas COULD be the cause of intermittent pump.
From now on, only buy your gas at high volume stations.
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