When starting the GMC 1994 S-15 Jimmy it cranks but does not start. after awile it stars and runs. when it rund there is no miss and no hesitation. let it set overnight and it has the same problem again
The pressure relief valve is in the spider fuel injector not the fuel pump. We have had our 94 gmc jimmy for 4 years & have had to replace the fuel injector 4 times which cost right at $500 each time for the part. Yes the spider fuel injector cost averages around $500.
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Re: hard start when cold/first start in morning
This kind of problem is most often caused by a failed check valve in the electric fuel pump, the lines and filter drain after setting and cause very long start/crank times, the check valve is part of the fuel pump in the gas tank.
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Sounds like you are loosing fuel pressure overnight. Since it takes 70+ psi to start and run, if you have zero pressure in the morning, it would take a long time of cranking to get the pressure back up.
If it is low or no pressure, the problem could be a faulty check valve in the fuel pump.
check to see if the starter clicks when you try it...you could go on the starter and cross the two posts and see if it trys to start. if it does not even do any thing than your starter is bad... i would think that your starter is probably out now cuz you have had to crank it over so much to get it running,.. and as far as it not starting i would change the plugs wires cap and rotor.
Check the power to the cold start injector. (it's only going to have fire for a few sec. after the key is turned on). If the fire is good, replace the cold start injector. This injector is activated for a few seconds when the engen temp is low to add a little fuel lower down in the intake and closer to the pistons.
The oil presure switch does have some bearing on the problem but my suggestion is to change the coil. I had a the same problem with an astro van. I changed everything that you have described and it fixed the problem just for a little while and then all of a sudden did it again. I changed the coild and the cold start swithch and never had the problem again.