1994 GMC Sonoma Fuel Spider injector

What is going wrong with them? Leaking? Hard start? Usually when they are replaced they last a long time. I know these engines are very finicky about fuel pressure and volume and they have tons of problems with the rubber pulsator in the fuel tank. The pulsator connects the pump to the sender and ruptures causing lower fuel volume creating all sorts of driveability problems

Did you replace the pulsator? Its the piece the fuel pump slides into? The problem your describing does not sound like a injector problem. To check for proper fuel volume you need to install a amp meter in series with the battery positive terminal and the fuel pump test lead(the test lead is usually a gray wire or red wire by itself with a female connector at the end)

That is also a good test for fuel volume so that is ok. Next step would be to watch data on a scan tool. Monitor coolant temp, o2 sensor voltage to make sure you dont have a shorted o2 sensor. Does the check engine light come on? Did you check it for codes? You can jump terminal a and b on the diagnostic connector under drivers side of dash and it will flash the codes through the check engine light.

When its hard to start, try spraying a shot of starting fluid into it and see if it starts right up. It needs spark fuel pressure and injector pulse to run, we need to find out what we are missing or losing. If you have a spark checker like a st125 that measures coil output voltage or another kind of spark checker but not the flashing light kind because that does not check voltage, we should have about 25000 volts. I have seen weak coils cause this same symptom.

Thats odd that they keep failing, I have never run into that before. Good luck