I have 99 S-10 with a 4.3. It won’t start. I have checked the rotor cap and ignition coil. I was told there is a check valve in the fuel pump that may be letting the pressure bleed off of the line while its parked. Is this true or is there something else that could be wrong?
If the fuel pump anti-drain back valve is faulty you can overcome the situation by cycling the ignition on and off.
Turn the ignition switch on so the dash lights come on for two seconds and then turn the ignition switch off. Repeat this a dozen times and then try starting the engine. This cycles the fuel pump enough times to reprime the fuel system. If the engine doesn’t start, the problem lies somewhere else.
Tester
Will the truck always run on a priming type fluid?