Cranks but won't start

What year? Mines an 1989 with fuel injection. When it sits with the battery disconnected and I go to start it I have to unplug my fuel pump relay and then plug it back in. Don't know why must be something with the computer. Do you hear the fuel pump prime when you turn the key?

JKaz

I should say it cranking but not firing or running...

I have not had a chance to work on it yet. I appreciate your suggestion.

Don't understand you saying "cranks but won't turn over" Cranking to me means it's turning over!!!

Just curious, did you find the problem? If not, check your chassis voltage when cranking. Most electronic ignitions require at least 10.5 volts to fire the ignition. It may still crank, but not fire the coils. It may be you have a drain on the chassis battery, that depletes it overnight.

Yes it has been sitting over the winter for about 5 months. Seafoam on the label claims to be a stabilizer ....

Seafoam does nothing to stabilize fuel (it a great cleaner though). You need to use something like Stabil.

Has it been sitting for a long time?

Ok thank you

Need more info on the year and motor, Carburetor or Fuel Injection, without more info I would speculate its a fuel problem. If FI motor the fuel pump is in the tank and you will have a connection on the fuel rail at the motor, here is where you can put a gauge to test, these test ports look like larger tire valves and work the same, You can also just remove the cap and release the pressure if there is any, crank, if no fuel comes out then bad fuel pump, if some fuel comes out then a gauge is needed to see what pressure its providing to see if it is in spec. Based on my GM knowledge, Port injection systems need around 50 psi to run right, TBI systems 20 psi.