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I suspect you have a failing electric fuel pump inside the fuel tank. To confirm this is the problem get a can of spray starting fluid from the auto parts store, when you experience the next no start spray the starting fluid into the air intake hose to the engine while a friend cranks it over with the starter, if it starts right up you likely have a defective fuel pump.
This happened to me I had to spray Starting fluid everytime eventually. Starting fluid wouldn't work after awhile. Its the fuel pump. Even though it comes on and works its not producing enough fuel pressure to start the engine. It's probably giving about 12-13lbs of pressure but it needs atleast 14lbs. of pressure. And a word of advice to buy a ACDelco original fuel pump if you don't want to have to replace it again in 1-2 years, it's more expensive but will last.
I think your fuel pressure is borderline.How accurate is the gauge? Those injectors usually wont work under 58psi. I would replace the fuel pumpp and filter if the truck has over 125K miles on the original pump. .
THOSE VEHICLES HAVE A HIGH PRESSURE FUEL PUMP THAT WILL ONLY START IF IT REACHES 60 PSI OR MORE.. BUT ONCE IT IS RUNNING REQUIRES LESS PRESSURE.... MAKE SURE THE FUEL PRESSURE WHEN STARTING EXCEEDS 60 PSI OR IT WILL NOT START...
where did you get the pump replaced?a dealer or local garage There are 2 pumps for the jimmy one for a plastis tank which is an 18 gal and one for a metal tank which is a 19 gal.if the jimmy has a metal tank get the 19 gal pump . i ran into the same problem with my 98 jimmy