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one reason for excessive crank time before starting could be the crankshaft postion sensor. I had this replaced on one of my vans with the 4.3 engine and it took care of the problem.
another problem may be water in the gas tank. drain it and if you live in a high humidty area use the STP water removal additive at least once a year. it's actualy just a blend of alcohols that binds with the water and removes it by moving it thru the combustion process.
Isn't it disgusting that you have to drop the tank to change a fuel pump on GM products, particulary because they seem to have been failing at an excessive rate for over 20 years. My Dad's Chysler had an access hatch in the trunk.
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