Try checking the wires on the side of the transmission and making sure they are all the way connected and check the wires to make sure there are no bare spots where is wire is showing...it could possibly be shorting out
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A whinning noise is usually from the starter spinning but not engaging with the flywheel. The solenoid or bendix gear may not be working which would require a replacement starter. If you heard a grinding noise, I would say some teeth are missing from the flywheel.
pump works when supplying power from the keys or other source some is it a new pump ? if is return for a exchange. if not even tho the pump may work when you power it with the key there might not be enough pressure from the pump to push enough fuel to the engine so i advise replacing it
Check the fuel filter-they had a recall on replacement filters(fram?-just google GMC Recalls) or go to 91 GMC Sonoma Repair=many sites to tell you and download manuel. Then the library has books if you dont. Good luck and God bless1
I have a 91 Accord. When I purchased it, the speedometer did not work. I replaced the VSS (Vehicle Speed Sensor) and the speedometer started working again. I paid $24 for the sensor on ebay. The local part stores wanted $150. It's an easy fix. It takes about 20 minutes to replace.